CN217112667U - Cable fixing electromechanical equipment fault diagnosis device and system - Google Patents
Cable fixing electromechanical equipment fault diagnosis device and system Download PDFInfo
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- CN217112667U CN217112667U CN202220076808.8U CN202220076808U CN217112667U CN 217112667 U CN217112667 U CN 217112667U CN 202220076808 U CN202220076808 U CN 202220076808U CN 217112667 U CN217112667 U CN 217112667U
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Abstract
The utility model provides a fixed electromechanical device fault diagnosis device of cable and system, include: the device is directly fixed on a cable and consists of a current measuring component and a fault diagnosis component, wherein the current measuring component is connected with the fault diagnosis component; the current measuring component comprises a current sensor and is used for collecting a current signal of the cable in a non-invasive mode; the fault diagnosis component is used for determining a fault diagnosis result of the electromechanical equipment connected with the cable according to the characteristics of the current signal. The cable fixing electromechanical equipment fault diagnosis device is mounted on the cable in a penetrating mode or in an opening mode. The device can be combined to form a system, and can be used for carrying out integral comprehensive analysis and diagnosis on a three-phase (or multi-phase) system of the electromechanical equipment. As above, the utility model discloses a fixed electromechanical device fault diagnosis device of cable and system, the engineering volume is big, the higher problem of installation condition, and reasonable in design is suitable for production and popularization and application.
Description
Technical Field
The utility model relates to an electromechanical device fault diagnosis technical field especially relates to a fixed electromechanical device fault diagnosis device of cable and system.
Background
At present, when an electromechanical equipment fault diagnosis device based on an electrical measurement signal is additionally arranged on an industrial field to acquire current and voltage signals, a current sensor and a voltage sensor are mostly arranged on a distribution line of field equipment, or a secondary output loop of an existing current transformer is modified, and a current signal measurement is directly connected in series into the electromechanical equipment fault diagnosis device to acquire, diagnose and analyze signals. When the system is integrated, an electromechanical equipment fault diagnosis device is often additionally arranged in a power distribution cabinet (or a low-voltage switch cabinet), or a diagnosis measurement cabinet is arranged by independently combining screens. Meanwhile, a power supply needs to be connected, an air switch needs to be configured, and a safety is configured for voltage measurement, so that the system is complex and large in size. Engineering practices generally involve signal acquisition, signal cabling, diagnostic or measurement device installation and power supply, and overall connection debugging. Therefore, the construction work amount is large, and the installation condition is high. The space in the existing power distribution cabinet is limited, and the difficulty in additionally arranging the fault diagnosis device of the electromechanical equipment is high; meanwhile, if an independent measurement and diagnosis cabinet is additionally arranged, on one hand, the layout of a power distribution room is influenced, extra area is occupied, and meanwhile, a large amount of wiring is needed between each power distribution cabinet and the measurement and diagnosis cabinet, so that hidden dangers are brought to the overall reliability of the system besides large cost and engineering quantity.
SUMMERY OF THE UTILITY MODEL
In view of the foregoing prior art, an object of the present invention is to provide a cable fixing electromechanical device fault diagnosis apparatus and system, which are used for solving the problems of the prior art that the signal acquisition is required to be performed by accessing the power distribution system, the engineering quantity is large, and the installation condition is high.
In order to achieve the above objects and other related objects, the present invention provides a cable fixing electromechanical device fault diagnosis apparatus, including: a current measurement component and a fault diagnosis component; the current measuring assembly comprises a current sensor for measuring a current signal of the cable in a non-invasive manner; the fault diagnosis component is used for determining a fault diagnosis result of the electromechanical equipment connected with the cable according to the characteristics of the current signal. The cable fixing electromechanical equipment fault diagnosis device is mounted on the cable in a penetrating mode or in an opening mode.
As a preferred technical solution, the cable-fixed electromechanical device fault diagnosis apparatus further includes: the device comprises a signal conditioning component, an A/D component, a compensation component and a signal analysis component; the current measuring component transmits a measured current signal to the signal conditioning component, the signal conditioning component conditions the current signal and transmits the conditioned current signal to the A/D component, the A/D component converts the current signal from an analog signal to a digital signal, the compensation component processes the current digital signal by the compensation component and transmits the processed current digital signal to the signal analysis component and the fault diagnosis component, and the fault diagnosis component judges, analyzes and diagnoses the current digital signal and a signal analysis result to obtain a fault diagnosis result; and the fault diagnosis result is output in a wired or wireless communication mode or is displayed and output by the cable fixing electromechanical equipment fault diagnosis device.
As a preferred technical solution, the cable-fixed electromechanical device fault diagnosis apparatus further includes: and the voltage measuring component is used for measuring the voltage signal. The voltage measuring component and the current measuring component are both connected with the fault diagnosis component. The diagnosis component is used for determining a fault diagnosis result of the electromechanical equipment connected with the cable according to the characteristics of the current signal and the voltage signal.
As a preferred technical solution, the current sensor includes at least one of: the sensor comprises a current transformer, a Hall sensor, a magnetic resistance sensor, a fluxgate sensor and a Rogowski coil sensor. The current signal of the cable is measured in a non-invasive mode through at least one device, fault diagnosis of the electromechanical equipment is achieved, and invasion to the original distribution line is avoided.
As a preferred technical solution, the method further comprises: the device comprises a signal conditioning component, an A/D component, a compensation component and a signal analysis component; the voltage measuring component transmits a measured voltage signal to the signal conditioning component, the current measuring component transmits a measured current signal to the signal conditioning component, the signal conditioning component conditions the current signal and the voltage signal and transmits the conditioned current signal and the conditioned voltage signal to the A/D component, the A/D component converts the current signal and the voltage signal from an analog signal into a digital signal, the A/D component transmits the current digital signal and the voltage digital signal to the signal analysis component and the fault diagnosis component after the processing of the compensation component, and the fault diagnosis component judges and analyzes the current digital signal, the voltage digital signal and a signal analysis result to obtain a fault diagnosis result; and the fault diagnosis result is output in a wired or wireless communication mode or is displayed and output by the cable fixing electromechanical equipment fault diagnosis device. The collected current signals and voltage signals are processed through the cooperation of the signal conditioning assembly, the A/D assembly, the compensation assembly and the signal analysis assembly, and the fault diagnosis assembly can conveniently judge and analyze faults.
As a preferred technical solution, the compensation component performs amplitude compensation or phase compensation by using one of the following methods or any combination thereof: zero point compensation, linear compensation, function compensation and interpolation compensation. Amplitude or phase compensation is carried out on the current signal or the voltage signal, so that the measurement precision is improved, and the diagnosis accuracy is further improved.
As a preferable technical solution, the cable-fixed electromechanical device failure diagnosis apparatus mounted on the cable in an open manner includes: female connecting piece and male connecting piece, female connecting piece inboard surface are provided with the screw thread, and male connecting piece outside surface is provided with the screw thread, and female connecting piece and male connecting piece pass through the screw thread and cooperate the connection, its characterized in that, female connecting piece constitute by the female connecting piece of first female connecting piece and the female connecting piece of second of mutually supporting the connection through inner groovy and outer recess, the female connecting piece homogeneous side opening of first female connecting piece and second, the inner groovy sets up at the female connecting piece opening part inboard surface of first female connecting piece, outer recess sets up at the female connecting piece opening part outside surface of second, male connecting piece constitute by the first male connecting piece and the second male connecting piece that the symmetry set up, first male connecting piece and second male connecting piece top all upwards extend have connecting portion, the screw thread setting is at connecting portion outside surface.
Preferably, the diameter of the cable fixing electromechanical equipment fault diagnosis device is selected according to the wire diameter of the measured cable. Can not receive the restriction of mounted position, directly fix this device and realize convenient installation and demolish of optional position on being surveyed the cable, can not confine the restriction in the position and the space of on-the-spot switch board like this, improve the selectivity of installation scope greatly.
As a preferred technical scheme, the cable fixing electromechanical device fault diagnosis device further comprises a power supply assembly, and the power supply assembly obtains a power supply through an external power supply mode or through a current transformer. The power taking can be realized without invading the existing electric circuit of the electromechanical equipment, and the method can not need to change the existing electric circuit.
As a preferred technical solution, the current sensor includes a current transformer, and the power supply assembly obtains a power supply through the current transformer in the current sensor. The current transformer in the limited power supply assembly and the current sensor in the current measuring device are shared, the structure is simplified, and the equipment is simplified.
As a preferred technical scheme, the current transformer is provided with a middle tap. The magnetic core saturation is avoided by arranging the tap, so that the requirements of power taking matching and precision matching are met.
As a preferred technical solution, the power supply assembly further includes an energy storage unit and a charge and discharge management unit; the charging and discharging management unit is used for monitoring the electric energy stored in the energy storage unit according to a preset working period, ensuring that the power supply assembly stably supplies power to the cable fixing electromechanical equipment fault diagnosis device, simultaneously maintaining the electric quantity of the energy storage unit in an optimal state, and dynamically managing the charging and discharging of the energy storage unit.
As a preferred technical solution, the power supply assembly obtains power supply through a current transformer. The current transformer can take electricity without invading the existing electric circuit of the electromechanical equipment, and the method can not change the existing electric circuit.
As a preferred technical solution, the fault diagnosis component is further configured to compensate, by using an interpolation method, a current cut-off interval caused by rectification on the current signal measured by the current measurement component, and obtain a compensated current signal; and the fault diagnosis component is used for determining a fault diagnosis result of the electromechanical equipment connected with the cable according to the compensated current value. The interval without current can be supplemented into a complete current waveform by utilizing an interpolation method, so that the data is more complete during analysis, and the diagnosis result is more accurate.
As a preferred technical solution, the current measuring assembly includes: the current sampling measurement branch and the current taking measurement branch are used for combining and calculating the currents measured by the current sampling measurement branch and the current taking measurement branch to obtain the secondary side current of the current transformer.
The utility model also provides a cable fixed electromechanical device fault diagnosis system, include: at least one cable-fixed electromechanical device fault diagnosis device as described above, the cable-fixed electromechanical device fault diagnosis device being connected to the display component and/or the communication component.
The utility model also provides a cable fixed electromechanical device fault diagnosis system, include: the cable fixing electromechanical equipment fault diagnosis device comprises a plurality of cable fixing electromechanical equipment fault diagnosis devices, wherein the cable fixing electromechanical equipment fault diagnosis devices are in communication connection.
As a preferred technical solution, in the cable-fixed electromechanical device fault diagnosis system, a plurality of cable-fixed electromechanical device fault diagnosis devices are provided, for example, a three-phase power distribution system may be provided in one to three; a plurality of multiphase systems containing phase-shifting transformers can be arranged.
According to a preferable technical scheme, a plurality of cable fixing electromechanical equipment fault diagnosis devices are arranged in the cable fixing electromechanical equipment fault diagnosis system, and a fault diagnosis component in each cable fixing electromechanical equipment fault diagnosis device is shared. The common diagnostic component can simplify the whole structure of the diagnostic system and reduce the cost.
As a preferred technical solution, the fault diagnosis devices of the cable-fixed electromechanical device are synchronized by an inter-phase hard trigger mode, or synchronized by a wireless signaling mode.
As a preferred technical solution, the cable fixing electromechanical device fault diagnosis device is provided with a plurality of cable fixing electromechanical device fault diagnosis devices, which are respectively arranged at the input end and/or the output end of the power conversion device, and are used for monitoring the relation between input and output and measuring the loss or abnormality of the power conversion device.
As a preferred technical solution, the power conversion device is a frequency converter or a transformer.
As above, the utility model relates to a fixed electromechanical device fault diagnosis device of cable has following beneficial effect: the current value of cable is gathered through non-intrusive mode, is used for fault diagnosis with the current value that current measurement subassembly surveyed and the magnitude of voltage that voltage measurement subassembly surveyed, under the condition of needn't invade current electromechanical device's circuit, realizes the fault diagnosis to electromechanical device, avoids invading original distribution lines, also need not equipment shut down, greatly reduced the degree of difficulty and the risk of engineering, reasonable in design is suitable for production and popularization and application.
Drawings
Fig. 1 is a circuit block diagram showing a cable-fixed electromechanical device failure diagnosis apparatus disclosed in embodiment 1;
fig. 2 is a first structural diagram of a current sensor in the cable-fixed electromechanical device failure diagnosis apparatus disclosed in embodiment 1;
fig. 3 is a second block diagram showing a current sensor in the cable-fixed electromechanical device failure diagnosis apparatus disclosed in embodiment 1;
fig. 4 is a third structural diagram showing a current sensor in the fault diagnosis apparatus for a cable-fixed electromechanical device disclosed in embodiment 1;
FIG. 5 is a schematic diagram of voltage measurement by the D-dot method of the fault diagnosis device for the cable-fixed electromechanical device disclosed in embodiment 1;
fig. 6 is a schematic view showing a cable-fixed electromechanical device failure diagnosis apparatus disclosed in embodiment 1;
fig. 7 is a schematic diagram showing the power supply of the current transformer of the fault diagnosis apparatus for a cable-fixed electromechanical device disclosed in embodiment 3;
fig. 8 is a current transformer power-taking circuit diagram of the fault diagnosis apparatus for the cable-fixed electromechanical device disclosed in embodiment 3;
fig. 9 is a circuit diagram showing a CT sensing-power taking integrated circuit of the fault diagnosis apparatus for the cable-fixed electromechanical device disclosed in embodiment 3;
fig. 10 is a circuit diagram showing a two-branch current measuring circuit of the fault diagnosis apparatus for the cable-fixed electromechanical device disclosed in embodiment 3;
fig. 11 is a schematic view of a CT center tap of the fault diagnosis apparatus for a cable-fixed electromechanical device disclosed in embodiment 3;
fig. 12 is a schematic view showing a current cut-off section of the fault diagnosis apparatus for a cable-fixed electromechanical device disclosed in embodiment 3 (when the current has a sinusoidal waveform);
fig. 13 is a schematic view showing inter-phase hard trigger synchronization of a cable-fixed electromechanical device fault diagnosis system disclosed in embodiment 4;
fig. 14 is a schematic diagram illustrating synchronization of wireless signaling manner of a fault diagnosis system for a cable-fixed electromechanical device disclosed in embodiment 4;
fig. 15 is a schematic view showing the entire configuration of a cable-fixed electromechanical device failure diagnosis apparatus in the cable-fixed electromechanical device failure diagnosis apparatus disclosed in embodiment 2;
fig. 16 is a schematic structural view of a female connector of the cable-fixed electromechanical device fault diagnosis apparatus in the cable-fixed electromechanical device fault diagnosis apparatus disclosed in embodiment 2;
fig. 17 is a schematic structural view of a male connector of the cable-fixed electromechanical device fault diagnosis apparatus in the cable-fixed electromechanical device fault diagnosis apparatus disclosed in embodiment 2;
fig. 18 is a schematic structural view of a second female connector of the cable-fixed electromechanical device fault diagnosis apparatus in the cable-fixed electromechanical device fault diagnosis apparatus disclosed in embodiment 2;
fig. 19 is a schematic structural view of a first female connector of the cable-fixed electromechanical device fault diagnosis apparatus in the cable-fixed electromechanical device fault diagnosis apparatus disclosed in embodiment 2;
fig. 20 is a schematic view showing voltage measurement in a cable-fixed electromechanical device failure diagnosis apparatus disclosed in embodiment 1;
fig. 21 is a block circuit diagram showing voltage measurement in a cable-fixed electromechanical device failure diagnosis apparatus disclosed in embodiment 1;
fig. 22 is a connection block diagram showing a cable fixing electromechanical device fault diagnosis apparatus in a cable fixing electromechanical device fault diagnosis system disclosed in embodiment 4, which is provided with three;
fig. 23 is a circuit diagram showing the current measurement of each branch of the fault diagnosis apparatus for the cable-fixed electromechanical device disclosed in embodiment 3;
fig. 24 is a schematic view showing a cable-fixed electromechanical device failure diagnosis apparatus disclosed in embodiment 5;
fig. 25 is a schematic view showing a cable fixing electromechanical device failure diagnosis apparatus disclosed in embodiment 4.
Wherein, 1, the cable; 2. a female connector; 3. an electromechanical device housing; 4. a first female connector; 5. a second female connector; 6. a male connector; 7. a connecting portion; 8. a first male connector; 9. a second male connector; 10. a protrusion; 11. an inner groove; 12. an outer groove.
Detailed Description
The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.
Please refer to fig. 1 to 25. It should be understood that the structure, ratio, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any structure modification, ratio relationship change or size adjustment should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the function that the present invention can produce and the purpose that the present invention can achieve. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and the present invention is also regarded as the scope of the present invention.
The first embodiment of the present invention, referring to fig. 1 to 6 and fig. 20 to 21, provides a cable-fixed electromechanical device failure diagnosis apparatus, including: a current measurement component, a voltage measurement component, and a fault diagnosis component.
The voltage measuring assembly and the current measuring assembly are connected with the fault diagnosis assembly; the current measuring assembly contains a current sensor to measure the current signal of the cable in a non-invasive manner. The fault diagnosis component is used for determining a fault diagnosis result of electromechanical equipment (such as a motor, a power supply conversion device and the like) connected with the cable according to the characteristics of the current signal. In practical applications, the current sensor may include at least one of: the sensor comprises a current transformer, a Hall sensor, a magnetic resistance sensor, a fluxgate sensor and a Rogowski coil sensor.
The cable-fixed electromechanical device fault diagnosis apparatus in this embodiment further includes: the device comprises a signal conditioning component, an A/D component, a compensation component and a signal analysis component; the current measuring component transmits a measured current signal to the signal conditioning component, the signal conditioning component conditions the current signal and transmits the conditioned current signal to the A/D component, the A/D component converts the current signal from an analog signal to a digital signal, the compensation component processes the current digital signal by the compensation component and transmits the processed current digital signal to the signal analysis component and the fault diagnosis component, and the fault diagnosis component judges, analyzes and diagnoses the current digital signal and a signal analysis result to obtain a fault diagnosis result; and the fault diagnosis result is output in a wired or wireless communication mode or is displayed and output by the cable fixing electromechanical equipment fault diagnosis device.
It should be noted that, the cable-fixed electromechanical device fault diagnosis apparatus in this embodiment may include only the current measurement component, but not the voltage measurement component, and the fault diagnosis component may diagnose the electromechanical device (such as the motor, the power conversion device, and the like) connected to the cable only by the current signal.
Continuing to explain, the cable-fixed electromechanical device fault diagnosis apparatus in this embodiment may include both the current measurement component and the voltage measurement component, and the fault diagnosis component may diagnose the electromechanical device (such as the motor, the power conversion device, and the like) connected to the cable by using the characteristics of the current signal and the characteristics of the voltage signal.
The cable fixing electromechanical device fault diagnosis device provided by the embodiment further comprises: a voltage measurement component for measuring a voltage signal; the voltage measuring component is connected with the fault diagnosis component; the diagnosis component is used for determining a fault diagnosis result of the electromechanical equipment connected with the cable according to the characteristics of the current signal and the voltage signal.
The cable fixing electromechanical device fault diagnosis apparatus may further include: the device comprises a signal conditioning component, an A/D component, a compensation component and a signal analysis component; the voltage measuring component transmits a measured voltage signal to the signal conditioning component, the current measuring component transmits a measured current signal to the signal conditioning component, the signal conditioning component performs filtering, amplification and other processing on the signal, the signal conditioning component conditions the current signal and the voltage signal and transmits the conditioned current signal and voltage signal to the A/D component, the A/D component converts the current signal and the voltage signal from analog signals into digital signals, the A/D component transmits the current digital signal and the voltage digital signal to the signal analyzing component and the fault diagnosis component, the signal analyzing component analyzes frequency, harmonic waves, frequency spectrums, torque and the like, and the fault diagnosis component judges and analyzes the current digital signal, the voltage digital signal and the signal analysis result to obtain a fault diagnosis result; the fault diagnosis result is output in a wired or wireless communication mode, or is displayed and output by a cable fixing electromechanical equipment fault diagnosis device.
In an embodiment, as shown in fig. 3, a current sensor in the cable-fixed electromechanical device fault diagnosis apparatus is implemented by using a current transformer, and an obtained current signal is subjected to signal conditioning (such as filtering, amplifying, and the like), where a current measurement principle of a current measurement component is as follows: (1) the current transformer is adopted to obtain a current signal on a cable on the secondary side of the current transformer of the electromechanical equipment, wherein the current transformer can specifically adopt a magnetic element, such as a magnetic ring with good magnetic flux density, so that the signal precision, the frequency response range and the linearity are improved. The magnetic ring can be made of, but not limited to, iron-silicon alloy, iron-aluminum alloy, iron-silicon-aluminum alloy, nickel-iron alloy, iron-cobalt alloy, soft magnetic ferrite, amorphous soft magnetic alloy, and ultra-microcrystalline soft magnetic alloy. (2) And (3) carrying out processing such as filtering on the acquired current signal, for example, carrying out low-pass filtering by adopting a filtering component, and inhibiting the noise of high-frequency noise aliasing to a fault diagnosis application frequency band. It should be noted that the low-pass filtering method in this embodiment may adopt technologies not limited to analog circuit filtering, digital filtering based on high-speed sampling, and the like.
In another embodiment, the measurement may be performed by a combination of a plurality of sensors, such as a combination of a hall sensor and a magnetoresistive sensor, as shown in fig. 2. As shown in fig. 4, a combination of a current transformer, a hall sensor and a magnetoresistive sensor is adopted. In practical application, other combination forms can be adopted, and finally acquired current signals are obtained through correlation calibration. The measurement by combining a plurality of sensors can not only compensate the influence of external electromagnetic interference, but also enlarge the frequency response range and the measurement precision of the measurement.
It should be further noted that the voltage measurement component in this embodiment may include: conductor electrode, measuring resistor, integral resistance and integrating capacitor, the cable conductor outside is located to the conductor electrode cover, and the conductor electrode is connected with integral resistance one end and measuring resistor one end respectively, and the integral resistance other end is connected with integral capacitor one end, and the integrating capacitor other end and the measuring resistor other end all ground connection.
Wherein, as shown in fig. 5, the D-dot method measures, the equivalent capacitance Cm generated by the coupling between the conductor electrode and the electric wire in the voltage measuring component, the measuring resistance Rm, the integral resistance Ri, the equivalent area of the sensor Aeq, the measured voltage Vi, the measured voltage Vo,
therefore, Vo is obtained by the formula 1 and is in direct proportion to the change rate of the electric field of the measuring point where the sensor is located, and Vo is obtained by processing the Vo and the measured voltage Vi through the integrating circuit. The fault of the electromechanical device can be diagnosed through the change of the absolute value of the voltage, and the diagnosis can also be made through the change of the relative value.
In practice, the voltage measuring assembly may also be implemented in another manner, as shown in fig. 20-21, by placing a conductor as the sensing electrode in close proximity to the distribution cable. Capacitive coupling occurs between the cable conductor (core wire) and the inductive electrode. The ac voltage in the cable will generate a small current through the coupling capacitor by the change of the electric field, as shown in equation 2, the current is proportional to the voltage change (differential value).
However, the coupling capacitance varies with the material of the cable sheath, the thickness of the cable sheath, and the change of the dielectric constant caused by the temperature and humidity, so it is difficult to measure the voltage value by measuring the capacitance value of the coupling capacitance. By generating a voltage v2 with the same amplitude and the same phase as the cable voltage v1 in the induction electrode, the current flowing in the coupling capacitor approaches zero, and the generated voltage v2 is measured, so that v1 can be obtained.
v＝v 1 -v 2 ；(3)
The current can be reduced to voltage through the integrating circuit, as shown in formula 3, the voltage comparison circuit outputs the difference value between v1 and v2, and after signal conditioning, the negative feedback voltage generation circuit adjusts the amplitude of v2, so that v2 follows v 1. The sensing electrode and cable conductor are separated from the outside by a guard electrode, which is kept at the same potential as v2 to block electric fields from neighboring cables and other sources that may interfere with the measurement.
It can be seen that, the fault diagnosis device for cable-fixed electromechanical devices in this embodiment collects current values and voltage values of cables in a non-invasive manner, uses current signals measured by the current measurement assembly and voltage signals measured by the voltage measurement assembly for fault diagnosis, realizes fault diagnosis of electromechanical devices without invading circuits of existing electromechanical devices, avoids invading original distribution lines, does not require equipment shutdown, greatly reduces difficulty and risk of engineering, outputs fault diagnosis results in a wired or wireless communication manner, or displays and outputs the fault diagnosis results through the fault diagnosis device for cable-fixed electromechanical devices, is convenient for checking the fault diagnosis results, and is reasonable in design and suitable for production, popularization and application.
The utility model discloses a second embodiment provides a fixed electromechanical device fault diagnosis device of cable, fixed electromechanical device fault diagnosis device of cable adopts the open-ended mode to install on the cable, and concrete mounting means is as follows:
when the cable fixing electromechanical device fault diagnosis device is installed in an opening mode, as shown in fig. 15 to 19, the cable fixing electromechanical device fault diagnosis device comprises: female connector 2 and male connector 6, the 2 inside surfaces of female connector are provided with the screw thread, the 6 outside surfaces of female connector are provided with the screw thread, female connector 2 and male connector 6 are connected through screw thread fit, female connector 2 comprises first female connector 4 and the female connector 5 of second through inner groovy 11 and outer groove 12 mutually support the connection, the homogeneous side opening of first female connector 4 and the female connector 5 of second, inner groovy 11 sets up at the 4 opening part inside surfaces of first female connector, outer groove 12 sets up at the 5 opening part outside surfaces of the female connector of second, male connector 6 comprises first male connector 8 and the male connector 9 of second that the symmetry set up, first male connector 8 and the male connector 9 top all upwards extend has connecting portion 7, the screw thread sets up at connecting portion 7 outside surfaces. The inner edge of the upper end face of the first female connecting member 4 is provided with a projection 10. Still include electromechanical device casing 3, electromechanical device casing 3 cover is established on cable 1 outside surface, and electromechanical device casing 3 one end is connected with male connector 6 joint or integrated into one piece. The first male connector 8 and the second male connector 9 have projections extending in the radial direction with respect to the connection portion 7. A gap is provided in the middle of the connecting portion 7. The current measurement assembly, the voltage measurement assembly, and the fault diagnosis assembly may all be disposed inside the electromechanical device housing 3.
It should be noted that the diameter of the cable fixing electromechanical device fault diagnosis device in this embodiment is selected according to the diameter of the measured cable, that is, the size of the cable fixing electromechanical device fault diagnosis device can be changed according to the diameter of the measured cable.
It should be noted that, in practical applications, the cable fixing electromechanical device fault diagnosis device may be installed on the cable not only in the above opening manner, but also in a piercing manner, and details thereof are not repeated herein.
Compared with the first embodiment, the installation mode of the cable fixing electromechanical equipment fault diagnosis device is further limited, the installation mode is adopted, the limitation of installation positions can be avoided, the device can be directly fixed on a tested cable to realize convenient installation and removal of any position, the limitation of the position and the space of a field power distribution cabinet can be avoided, and the selectivity of the installation range is greatly improved.
The utility model discloses a third embodiment provides a fixed electromechanical device of cable fault diagnosis device can also include in the fixed electromechanical device of cable fault diagnosis device in this embodiment: the power supply assembly acquires a power supply through a current transformer, and specifically acquires the power supply as follows:
as shown in fig. 7, when a load such as a resistor is connected to the secondary side of the current transformer CT and the toroidal core of the current transformer CT is fitted around the ac distribution cable, a current i flows through the ac distribution cable passing through the current transformer CT (i.e., the primary side of the current transformer CT) s And (t) inducing current on the secondary side of the current transformer CT and flowing to a load, so that the current transformer obtains electricity. Load voltage U at this time o And (t) is alternating, needs rectification, and needs to be connected with a DC-DC converter after rectification in order to convert the direct current into the direct current required by the cable fixed electromechanical equipment fault diagnosis device, so that the output of the DC-DC converter meets the requirement of the cable fixed electromechanical equipment fault diagnosis device on a power supply. Therefore, as shown in fig. 8, a current transformer CT power supply should include three parts, namely a current transformer CT, a rectifying circuit and a post-stage DC-DC converter.
It should be further noted that, in practical applications, the cable-fixed electromechanical device fault diagnosis apparatus may not only obtain power through the current transformer, but also supply power through an external power supply mode, a battery mode, an energy collection mode (solar energy, wind energy, temperature, vibration, capacitive sensing, microwave sensing, etc.), and the like, which is not described herein again.
In addition, the power supply assembly also comprises an energy storage unit and a charging and discharging management unit; and the charging and discharging management unit is used for monitoring the electric energy stored by the energy storage unit according to a preset working period. The energy storage unit may be a super capacitor or a battery.
The power supply assembly can also share a current transformer used as a current sensor. As shown in fig. 9, the current transformer for measuring and the current transformer for taking electricity can be combined to use the same current transformer, and the size of the device is reduced by combining two transformers, so that the device is simplified, the compactness of the device is improved, and the device is convenient to miniaturize.
It should be noted that the compensation component is further configured to compensate a current cut-off interval caused by rectification of the current value measured by the current measurement component by using an interpolation method, so as to obtain a compensated current value; and the fault diagnosis component is used for determining a fault diagnosis result of the electromechanical equipment connected with the cable according to the compensated current value. As shown in fig. 12, when analyzing the current, the fault diagnosis module may use an interpolation method to compensate a current cut-off interval caused by rectification, and compensate the interval without current into a complete current waveform for analysis.
Wherein the "current measurement" section can also be as shown in fig. 10 and 23, the current measurement assembly includes: a current sampling measurement branch and a current taking measurement branch, wherein the two branches may adopt the same circuit structure, as shown in fig. 23. I in the figure 1 (t) and i 2 And (t) respectively obtaining current values measured by the current sampling measuring branch and the current obtaining measuring branch, and combining the currents measured by the current sampling measuring branch and the current obtaining measuring branch to calculate the secondary side current of the current transformer. When the voltage induced by the secondary side is lower than the conduction voltage of the rectifier module, a current path is provided through the current sampling measurement branch; when the voltage induced by the secondary side is higher than the conducting voltage of the rectifier module, the current (working current and leakage current) flowing through the rectifier module and the rear-stage circuit thereof is also contained, and the secondary side of the current transformer CT can be obtainedThe full current of (c). And measuring the voltage at two ends of the sampling resistor with known resistance through the A/D, and calculating the current flowing through the sampling resistor according to ohm's law.
It is worth mentioning that the current transformer is provided with a center tap as shown in fig. 11. The coil on the same CT is provided with a P1/P2 tap, and the middle of the coil is also provided with an S1/S2 tap. P1/P2 is used as a power taking end, and S1/S2 is used as a current measuring end. And vice versa.
In the present embodiment, the measured current signal is compensated by interpolation, but in practical applications, compensation may be performed by zero point compensation, linear compensation, or functional compensation, or by a combination of the above compensation algorithms, which are not listed here.
Compared with the first embodiment, the embodiment further clarifies a power taking mode of the fault diagnosis device of the cable fixing electromechanical equipment, and the current transformer is used for obtaining a power supply and converting alternating current of the current transformer into direct current. And the output of the DC-DC converter meets the requirement of the cable fixed electromechanical equipment fault diagnosis device on the power supply, and the power supply is obtained in an induction power taking mode, so that the existing electric circuit of the electromechanical equipment can be completely prevented from being invaded, the method can avoid changing the existing electric circuit, and effectively reduces the engineering complexity and risk brought by the method.
The utility model discloses a fourth embodiment provides a fixed electromechanical device fault diagnosis system of cable, include: one of the cable fixing electromechanical device fault diagnosis apparatus further includes: the fault diagnosis device of the cable-fixed electromechanical equipment is connected with a display component (such as a display screen) and/or a communication component (such as a Bluetooth module), and the communication mode can be a wired communication mode or a wireless communication mode.
The utility model discloses a fifth embodiment provides a fixed electromechanical device fault diagnosis system of cable, include: a plurality of cable-fixed electromechanical device failure diagnosis apparatuses according to any one of the first to third embodiments described above, the plurality of cable-fixed electromechanical device failure diagnosis apparatuses being connected in communication with each other. The practical application can also comprise: the fault diagnosis device of the cable fixing electromechanical equipment is connected with a display component (such as a display screen) and a communication component (such as a Bluetooth module), and the communication mode can be a wired communication mode or a wireless communication mode. It should be further noted that the fault diagnosis component in each of the cable-fixed electromechanical device fault diagnosis apparatuses may be a common fault diagnosis component.
As shown in fig. 22, three fault diagnosis devices are specifically provided for the cable-fixed electromechanical device, the three fault diagnosis devices S1, S2, and S3 may share one M1 module, and the M1 module may include an integrated analysis module, and comprehensively analyzes three-phase information measured and analyzed by S1, S2, and S3, and diagnoses a fault (such as three-phase power imbalance, three-phase load imbalance, winding turn-to-turn short circuit, and the like) of the entire system of the electromechanical device. The M1 module may further include a fault diagnosis component, and in this case, the fault diagnosis components in S1, S2, and S3 may be omitted, and a common fault diagnosis component may be used. The diagnostic information measured in the three fault diagnosis devices S1, S2 and S3 is transmitted to the comprehensive analysis module in the M1 module, the comprehensive analysis module comprehensively analyzes the diagnostic information of the three fault diagnosis devices S1, S2 and S3, and the fault diagnosis component in the M1 module carries out fault diagnosis on the comprehensively analyzed information.
As shown in fig. 25, by measuring the voltages of the three phases, whether the voltages are balanced is confirmed from the voltage values of the three phases.
For example, S1 to S3 are respectively provided on the cables of the respective phases L1 to L3, and the measured values are as follows:
| three phases | Voltage of | Electric current |
| L1 | V 1 | I 1 |
| L2 | V 2 | I 2 |
| L3 | V 3 | I 3 |
Voltage imbalance is one way to measure the voltage difference between the phases of a three-phase system. The voltage imbalance is the average maximum voltage change divided by the three-phase average voltage, calculated to produce an imbalance in percent. The following examples are given:
if the measured line voltage is V 1 ＝462V、V 2 463V and V 3 455V, the average value is V ave ＝460V。
Thus, the voltage imbalance is:
[(460–455)x 100]÷460＝1.1％
similarly, the diagnosis of three-phase current imbalance and three-phase load imbalance and the calculation of zero-sequence current can also be realized in a similar way.
Further, as shown in fig. 22, the cable fixing electromechanical device fault diagnosis apparatus is synchronized as follows: the fault diagnosis devices of the cable-fixed electromechanical equipment are synchronized by an inter-phase hard trigger mode, as shown in fig. 13, the fault diagnosis devices are synchronized by the inter-phase hard trigger mode, three fault diagnosis devices S1, S2 and S3 are connected to cables L1, L2 and L3 of a three-phase system, the three fault diagnosis devices are connected by wires, one of the three fault diagnosis devices S1 serves as a master clock and sends out a signal, and the other two fault diagnosis devices S2 and S3 receive a rising edge or a falling edge of a level sent by the master clock S1 to perform clock synchronization or perform clock synchronization by using pulses. Therefore, the S1, the S2 and the S3 can start acquisition at the same time and keep data synchronization. Any one of the devices S1, S2, S3 may be used as a master clock.
It should be further noted that, the fault diagnosis devices of the cable-fixed electromechanical device may be synchronized not only in an inter-phase hard trigger manner, but also in a wireless signaling manner, as shown in fig. 14, the three fault diagnosis devices S1, S2, and S3 are synchronized in a wireless signaling manner. A sending end (such as M1, a master clock) firstly sends a synchronous packet, and an RF (radio frequency) hardware chip at the sending time records a timestamp during sending; the receiving end (such as S1, S2, S3) records UTC during receiving in the receiving interruption; then, the transmitting end (M1) reads the transmission time stamp of the synchronous packet of the RF hardware chip, calculates the UTC of the transmitting end, transmits the time stamp packet again, and notifies the receiving end of the UTC record. And the receiving end matches the UTC time with the UTC of the synchronous Packet and then calculates a difference value to realize clock synchronization. For example, when using the IEEE 802.15.4 protocol for communication, an AT86RF233 with an internal timer can be used as the RF hardware chip. When a timer event occurs (e.g., sending a synchronization Packet), the current timestamp will be captured into the frame buffer. And the synchronous packet sending UTC can also use software to record UTC without depending on an RF hardware chip. But because: 1) time precision of software processing is poor; 2) the sending delay caused by wireless channel collision and the time recorded by software are inaccurate; the effect of recording using RF hardware is better. Meanwhile, the receiving end can also use the RF hardware chip to record the timestamp and then calculate the UTC of the receiving end, so that the time precision is further improved. Any one of the above devices S1, S2, S3, and M1 may be a master clock; one of S1, S2 and S3 can also play the role of M1.
Therefore, the fault diagnosis system for the cable-fixed electromechanical equipment in the embodiment synchronizes the data and the analysis result obtained among the fault diagnosis devices for the cable-fixed electromechanical equipment, accurately reflects the three-phase relation, facilitates fault diagnosis of the cable-fixed electromechanical equipment through the synchronized data and the analysis result, is reasonable in design, and is suitable for production, popularization and application.
The utility model discloses a electromechanical device fault diagnosis system is fixed to cable that sixth embodiment provided, this embodiment provides a different electromechanical device fault diagnosis device's position of setting for the fourth embodiment.
In the present embodiment, the three-phase power supply connected to the cable-fixed electromechanical device fault diagnosis system is provided with the power conversion device, and as shown in fig. 24, the cable-fixed electromechanical device fault diagnosis system in the present embodiment can also diagnose a fault of the power conversion device.
The concrete connection mode is as follows: the input ends of the power conversion devices are respectively connected with fault diagnosis devices S1-in, S2-in and S3-in, the output ends of the power conversion devices are respectively connected with fault diagnosis devices S1-out, S2-out and S3-out, and the six fault diagnosis devices S1-in, S2-in, S3-in, S1-out, S2-out and S3-out can share one M1 module, so that the embodiment can also monitor the relation of input and output and measure the loss or the abnormity of the power conversion devices, wherein the power conversion devices can be frequency converters or transformers.
The specific diagnosis principle is as follows: the input voltage and current, the output voltage and current of the power conversion device are measured respectively, the calculated input power and output power are divided, the efficiency of the power conversion device is calculated, and if the efficiency is too low, the power conversion device can be diagnosed to have faults.
The input and input total powers Σ P can be calculated respectively according to the following formula:
P 1 ＝V 1 ×I 1
P 2 ＝V 2 ×I 2
P 3 ＝V 3 ×I 3
ΣP＝P 1 +P 2 +P 3
taking a power conversion device as an example, the total output power is respectively input and output according to the following measured values:
when calculating the efficiency of the power conversion device, the total power sigma P is output out Divided by total input power Σ P in Efficiency in percent is calculated. As can be seen,the single-cable fixed electromechanical equipment fault diagnosis device can only obtain single-phase power, and the calculation of the efficiency of the power conversion device requires the calculation of total input and output powers sigma P (respectively expressed as sigma P) in Sum sigma P out ) Then, the conversion efficiency was calculated. And the conversion efficiency needs to be based on the input of power of each phase at the same time, and the fault diagnosis devices of the cable fixed electromechanical equipment forming the system need to be kept synchronous.
It can be seen that this embodiment provides a different cable fixed electromechanical device fault diagnosis system, and the position and the quantity of the fault diagnosis device that wherein sets up are different with the cable fixed electromechanical device fault diagnosis system in the fourth embodiment, make the utility model discloses well cable fixed electromechanical device fault diagnosis system's structure is more nimble changeable, and in practical application, the position and the quantity of fault diagnosis device can also change according to actual need, if only set up the input at power conversion device, or only set up the output at power conversion device, or set up a diagnostic device on a certain looks, the cable fixed electromechanical device fault diagnosis system in this embodiment can adapt to various monitoring environment, has extensive application scenario.
To sum up, the utility model relates to a fixed electromechanical device fault diagnosis device of cable and system solves and need insert distribution system among the prior art and just can carry out signal acquisition, and the engineering volume is big, the higher problem of installation condition, and reasonable in design is suitable for production and popularization and application. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (19)
1. A cable-fixed electromechanical device fault diagnosis apparatus, comprising: a current measurement component and a fault diagnosis component;
the current measuring component is connected with the fault diagnosis component;
the current measuring assembly comprises a current sensor for measuring a current signal of the cable in a non-invasive manner;
the fault diagnosis component is used for determining a fault diagnosis result of the electromechanical equipment connected with the cable according to the characteristics of the current signal;
the cable fixing electromechanical equipment fault diagnosis device is installed on the cable in a piercing mode or an opening mode.
2. The cable-fixed electromechanical device fault diagnosis apparatus according to claim 1, further comprising: the device comprises a signal conditioning component, an A/D component, a compensation component and a signal analysis component;
the current measuring component transmits a measured current signal to the signal conditioning component, the signal conditioning component conditions the current signal and transmits the conditioned current signal to the A/D component, the A/D component converts the current signal from an analog signal to a digital signal, the compensation component processes the current digital signal by the compensation component and transmits the processed current digital signal to the signal analysis component and the fault diagnosis component, and the fault diagnosis component judges, analyzes and diagnoses the current digital signal and a signal analysis result to obtain a fault diagnosis result;
and the fault diagnosis result is output in a wired or wireless communication mode or is displayed and output by the cable fixing electromechanical equipment fault diagnosis device.
3. The cable-fixed electromechanical device fault diagnosis apparatus according to claim 1, further comprising: a voltage measurement component for measuring a voltage signal;
the voltage measuring component is connected with the fault diagnosis component;
the diagnosis component is used for determining a fault diagnosis result of the electromechanical equipment connected with the cable according to the characteristics of the current signal and the voltage signal.
4. A cable tie-down electro-mechanical device fault diagnosis apparatus as claimed in claim 1, wherein said current sensor includes at least one of: the sensor comprises a current transformer, a Hall sensor, a magnetic resistance sensor, a fluxgate sensor and a Rogowski coil sensor.
5. A cable fixed electromechanical device failure diagnosis apparatus according to claim 3, further comprising: the device comprises a signal conditioning component, an A/D component, a compensation component and a signal analysis component;
the voltage measuring component transmits a measured voltage signal to the signal conditioning component, the current measuring component transmits a measured current signal to the signal conditioning component, the signal conditioning component conditions the current signal and the voltage signal and transmits the conditioned current signal and the conditioned voltage signal to the A/D component, the A/D component converts the current signal and the voltage signal from an analog signal into a digital signal, the A/D component processes the current digital signal and the voltage digital signal through the compensation component and transmits the processed current digital signal and the processed voltage digital signal to the signal analysis component and the fault diagnosis component, and the fault diagnosis component judges, analyzes and diagnoses the current digital signal, the voltage digital signal and a signal analysis result to obtain a fault diagnosis result;
and the fault diagnosis result is output in a wired or wireless communication mode or is displayed and output by the cable fixing electromechanical equipment fault diagnosis device.
6. The cable-fixed electromechanical device fault diagnosis apparatus as claimed in claim 1, wherein the cable-fixed electromechanical device fault diagnosis apparatus mounted on the cable in an open manner comprises: female connecting piece and male connecting piece, female connecting piece inboard surface are provided with the screw thread, and male connecting piece outside surface is provided with the screw thread, and female connecting piece and male connecting piece pass through the screw thread and cooperate the connection, its characterized in that, female connecting piece constitute by the female connecting piece of first female connecting piece and the female connecting piece of second of mutually supporting the connection through inner groovy and outer recess, the female connecting piece homogeneous side opening of first female connecting piece and second, the inner groovy sets up at the female connecting piece opening part inboard surface of first female connecting piece, outer recess sets up at the female connecting piece opening part outside surface of second, male connecting piece constitute by the first male connecting piece and the second male connecting piece that the symmetry set up, first male connecting piece and second male connecting piece top all upwards extend have connecting portion, the screw thread setting is at connecting portion outside surface.
7. The cable-fixed electromechanical device fault diagnosis apparatus according to claim 1, wherein an inner diameter or an outer diameter of the cable-fixed electromechanical device fault diagnosis apparatus is selected according to a wire diameter of a measured cable.
8. The cable-fixed electromechanical device fault diagnosis apparatus according to claim 1, wherein the cable-fixed electromechanical device fault diagnosis apparatus further includes a power supply component, and the power supply component obtains power by an external power supply manner, a battery manner, or a current transformer.
9. The cable fixed electromechanical device fault diagnosis apparatus of claim 8, wherein the current sensor includes a current transformer, and the power supply module obtains power through the current transformer in the current sensor.
10. The cable tie-down electro-mechanical device fault diagnosis apparatus of claim 9, wherein the current transformer is provided with a center tap.
11. The cable tie electromechanical device fault diagnostic apparatus of claim 9, wherein the current measurement assembly comprises: the current sampling and measuring branch circuit and the current taking and measuring branch circuit.
12. The cable fixed electromechanical device fault diagnosis apparatus of claim 8, wherein the power supply module further includes an energy storage unit and a charge and discharge management unit;
the charging and discharging management unit is used for monitoring the electric energy stored in the energy storage unit, ensuring that the power supply assembly stably supplies power to the cable fixing electromechanical equipment fault diagnosis device and simultaneously maintaining the electric quantity of the energy storage unit in an optimal state.
13. A cable-bound electromechanical device fault diagnostic system, comprising: a plurality of the cable-bound electromechanical device fault diagnostic apparatus of any one of claims 1 to 12 communicatively coupled therebetween.
14. The cable tie-down electro-mechanical device fault diagnosis system of claim 13, wherein the cable tie-down electro-mechanical device fault diagnosis system further comprises: and the display component and/or the communication component are/is connected with the cable fixing electromechanical equipment fault diagnosis device.
15. The cable tie-down electro-mechanical device fault diagnosis system of claim 13, wherein the fault diagnosis component of each of the cable tie-down electro-mechanical device fault diagnosis apparatuses is common.
16. The cable-fixed electromechanical device fault diagnosis system according to claim 13, wherein the number of the cable-fixed electromechanical device fault diagnosis means is set to match the number of phases of the power supply of the power distribution system.
17. The system for diagnosing faults of electromechanical devices fixed to cable according to claim 13, wherein the plurality of devices for diagnosing faults of electromechanical devices fixed to cable are synchronized through hard triggering between phases or through wireless signaling.
18. The cable-fixed electromechanical device fault diagnosis system according to claim 13, wherein the plurality of cable-fixed electromechanical device fault diagnosis means are respectively provided at an input terminal and/or an output terminal of the power conversion means.
19. The system of claim 18, wherein the power conversion device is a frequency converter or a transformer.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115719543A (en) * | 2022-11-09 | 2023-02-28 | 国网上海市电力公司 | Electric automobile fills electric pile fault diagnosis alarm device |
| CN115719543B (en) * | 2022-11-09 | 2024-05-24 | 国网上海市电力公司 | A fault diagnosis and alarm device for electric vehicle charging pile |
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