CN119805328A - Portable DC partial discharge current pulse group generation system and equipment detection method thereof - Google Patents
Portable DC partial discharge current pulse group generation system and equipment detection method thereof Download PDFInfo
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Abstract
The invention relates to a portable direct-current partial discharge current pulse group generation system and a device detection method thereof, belongs to the technical field of direct-current partial discharge tests, and solves the problem that the prior art lacks a portable direct-current partial discharge current pulse group generation system and a matched device detection method. The portable direct current partial discharge current pulse group generation system comprises a central processing unit, a current pulse-time sequence generator and an inductor, wherein the central processing unit is used for loading an algorithm file of an abc equivalent model to construct a reference direct current TPRPD spectrogram, the current pulse-time sequence generator is used for generating a corresponding transient current pulse group according to the reference direct current TPRPD spectrogram, and the inductor is used for being connected in a test loop of direct current electrical equipment and simulating a direct current PD source to output an adjustable transient current pulse group in the test loop of the direct current electrical equipment based on the transient current pulse group injected into the inductor.
Description
Technical Field
The invention relates to the technical field of direct-current partial discharge testing, in particular to a portable direct-current partial discharge current pulse group generating system and a device detection method thereof.
Background
In the operation process of an insulation system of high-voltage direct-current electrical equipment (such as a converter transformer and a direct-current cable), partial discharge (PARTIAL DISCHARGE, PD) can be possibly caused due to the influence of various reasons such as electric corrosion, vibration abrasion cracking, thermal cracking, damp and the like, so that gradual change process information of insulation degradation and performance degradation is often contained in PD signals, and PD detection becomes the most core means for controlling the quality and the operation state of the whole life cycle of the main equipment. The PD source in the equipment continuously generates a single ns-level rising edge current pulse, and the current pulse generated by the direct current PD source is detected by an ultra-wideband method (including a high-frequency method) to be used as the most commonly used technical means at present for carrying out daily live detection and on-line monitoring on a converter transformer and a direct current cable device. These instruments and systems for conducting PD live detection and on-line monitoring are delivered to the user after performing the type test and the factory test required by the relevant standards. However, for users such as power supply companies, there is a lack of related technical means to determine and evaluate whether the used instruments and the on-line monitoring system that has been put into operation can work properly, and meet the requirements of direct current PD detection.
The common judging method is that the method is entrusted to a professional institution, defects (tips, air gaps, suspension and the like) are arranged in laboratory true equipment, a high-voltage test is carried out, the defects are caused to discharge stably, a PD source formed by insulation defects is simulated, whether an ultra-wideband (high-frequency) direct-current PD instrument or an online monitoring system can work normally or not is judged, and whether a test result given by an algorithm is consistent with the type of the arranged defect model or not is judged. This mode of operation is laborious and laborious to develop, and the user such as the power company needs to transport the equipment to the test unit, which is not possible with the on-line monitoring system already installed on site.
Therefore, how to design a portable dc partial discharge current pulse group generating system and realize the detection of the PD detecting instrument or the on-line monitoring system is a technical problem to be solved.
Disclosure of Invention
In view of the above analysis, the present invention provides a portable dc partial discharge current pulse group generating system and a device detection method thereof, which are used for solving the problem of lack of a portable dc partial discharge current pulse group generating system and a matched device detection method in the prior art.
In one aspect, the invention provides a portable DC partial discharge current pulse group generation system, which comprises a central processing unit, a current pulse-time sequence generator and an inductor, wherein,
The central processing unit is used for loading an algorithm file of the abc equivalent model and constructing a reference direct current TPRPD spectrogram;
the current pulse-time sequence generator is used for generating a corresponding transient current pulse group according to the reference direct current TPRPD spectrogram;
and the inductor is connected in the test loop of the direct current electrical equipment and is used for simulating the direct current PD source to output the adjustable transient current pulse group in the test loop of the direct current electrical equipment based on the transient current pulse group injected into the inductor.
Based on the scheme, the invention also makes the following improvements:
further, the abc equivalent model refers to an abc equivalent model of an air gap of an internal insulation defect of the direct current electrical equipment.
Further, by adjusting the amplitude intensity of the transient state pulse group injected into the sensor, a corresponding adjustable transient state current pulse group is induced on a lead or a ground wire of a test loop of the direct current electrical equipment.
Further, the inductor adopts an ultra-wideband current transformer.
Further, the generating system also comprises a mobile terminal and a communication module, wherein the mobile terminal is connected with the central processing unit through the communication module,
The mobile terminal is used for storing the algorithm file of the abc equivalent model in advance and transmitting the algorithm file to the central processing unit through the communication module.
Further, the generating system also comprises a power module and a man-machine interaction module, wherein,
The power module is used for supplying power to the man-machine interaction module, the central processing unit, the current pulse-time sequence generator and the communication module;
the man-machine interaction module is used for acquiring and displaying states of the power supply module, the central processing unit, the current pulse-time sequence generator and the communication module.
Furthermore, the power module, the man-machine interaction module, the central processing unit, the current pulse-time sequence generator and the communication module form an integrated device, and the integrated device is connected with the inductor through a coaxial cable and is connected with the mobile terminal through a wireless or wired communication module.
On the other hand, the invention also provides a device detection method based on the portable direct current partial discharge current pulse group generation system, which comprises the following steps:
taking a PD detection instrument or an online monitoring system used by the direct current electrical equipment in an actual detection scene as tested equipment, and matching an inductor according to the tested equipment;
the central processing unit loads an algorithm file of the abc equivalent model, builds a reference direct current TARPD spectrogram, generates transient current pulse groups by the current pulse-time sequence generator, and outputs the transient current pulse groups to the sensor;
The inductor simulates a DC PD source to output an adjustable transient current pulse group in a test loop of DC electrical equipment based on the received transient current pulse group;
and judging whether the tested equipment works normally or not by comparing the reference DC TARPD spectrogram with the test DC PRPD spectrogram.
Based on the scheme, the invention also makes the following improvements:
further, the sensor is matched according to the tested equipment, and the steps are performed:
If the tested system only has one ultra-wideband current transformer, one clamping ultra-wideband current transformer is configured as the inductor.
Further, whether the tested equipment works normally or not is judged by comparing the reference DC TARPD spectrogram with the test DC PRPD spectrogram, and the steps are executed:
And comparing the difference between the reference DC TARPD spectrogram and the test DC PRPD spectrogram according to a given discrimination basis, if the difference between the reference DC TARPD spectrogram and the test DC PRPD spectrogram is not higher than a preset difference threshold value, indicating that the tested equipment works normally, and otherwise, judging that the tested equipment works abnormally.
Compared with the prior art, the invention has at least one of the following beneficial effects:
The portable direct current partial discharge current pulse group generation system provided by the invention enables the amplitude intensity of each transient current pulse in the transient current pulse group to be adjustable through the cooperation of the central processing unit, the current pulse-time sequence generator and the inductor, can truly simulate signals generated by a direct current PD source in a time domain and a frequency domain, and has time distribution characteristics consistent with those of the real direct current PD source, thereby better simulating the generation process of the direct current partial discharge current pulse group. In addition, the system adopts a portable integrated device with a visual input window, different inductors can be selected according to actual conditions, signals of transient current pulse groups are injected into the selected inductors, different working scenes can be well adapted, field requirements are met, the problem that a portable direct current partial discharge current pulse group generating system is lacking in the prior art is well solved, and a strong technical guide is provided for the related technical field.
In addition, the invention also provides a device detection method based on the portable direct current partial discharge current pulse group generation system, the generation system is utilized to induce the adjustable transient current pulse group, the adjustable transient current pulse group is detected through the tested device (the direct current PD instrument or the online monitoring system based on the ultra-wideband method), and the reference direct current TARPD spectrogram and the test direct current PRPD spectrogram are compared to judge whether the tested device works normally or not.
In the invention, the technical schemes can be mutually combined to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, like reference numerals being used to designate like parts throughout the drawings;
fig. 1 is a schematic diagram of a portable dc partial discharge current pulse train generating system according to embodiment 1 of the present invention;
FIG. 2 is an abc equivalent model of an air gap of an internal insulation defect of a DC electrical device according to embodiment 1 of the present invention;
FIG. 3 is a diagram of a DC TARPD constructed by an abc equivalent model provided in example 1 of the present invention;
FIG. 4 is a schematic diagram of a single transient current pulse provided in embodiment 1 of the present invention;
FIG. 5 is a schematic diagram of another portable DC partial discharge current pulse train generating system according to embodiment 1 of the present invention;
fig. 6 is a flowchart of a device detection method based on a portable dc partial discharge current pulse group generating system according to embodiment 2 of the present invention.
Fig. 7 is a schematic diagram of the connection relationship of the device detection used when the dc electrical device is a converter transformer.
Fig. 8 is a schematic diagram of the connection relationship of the device detection used when the dc electrical device is a dc cable.
Detailed Description
The following detailed description of preferred embodiments of the application is made in connection with the accompanying drawings, which form a part hereof, and together with the description of the embodiments of the application, are used to explain the principles of the application and are not intended to limit the scope of the application.
In a specific embodiment 1 of the present invention, a portable dc partial discharge current pulse group generating system is provided, and a schematic structural diagram of the system is shown in fig. 1, and the system includes a central processing unit, a current pulse-time sequence generator and a sensor, and functions of the components are described as follows.
(1) And the central processing unit is used for loading an algorithm file of the abc equivalent model and constructing a reference direct current TPRPD spectrogram.
The spectrogram of direct current TPRPD, namely peak-time sequence (q-t), is constructed after an algorithm file (txt) of an abc equivalent model is loaded by a central processing unit, and is used for distinguishing the spectrogram from a spectrogram of direct current TPRPD detected by a PD detection instrument or an online monitoring system, and the constructed spectrogram of direct current TPRPD is called a reference spectrogram of direct current TPRPD. The structural schematic diagram of the abc equivalent model of the air gap of the internal insulation defect of the direct current electrical equipment is shown in fig. 2. Next, the following description is made on the algorithm file of the abc equivalent model of the internal insulation defect air gap of the dc electrical equipment.
The content of the algorithm file loaded with the abc equivalent model mainly consists of formulas (1) to (4). Assuming that no discharge occurs in the air gap in the pressurizing process (one of the assumed conditions of the solving model, after the defect charging time is reached, the abc equivalent model discharges, namely voltage mutation), taking the fact that the RC series-parallel circuit is connected with a direct-current voltage source at the time t=0 into consideration, and solving zero-state response of the circuit under excitation of step voltage U 0. In fig. 2, b represents a defect, a is an insulating medium of a portion in series with the defect, c is other insulating medium than a, and a circuit equation as shown below can be established:
Wherein U a、Ub represents the voltages across the capacitor C a、Cb corresponding to a and b, respectively, and i b1、ib2、ia1、ia2 represents the current flowing through R b、Cb、Ra、Ca, respectively.
The formula (1) is simplified as:
CbadUb/dt+UbRba/(RbRa)＝U0/Ra (2)
Wherein C ba＝Cb+Ca;Rba＝Rb+Ra is the same as the formula.
Solving the formula (2) to obtain:
Ub(t)＝RbU0/Rba+U0(Ca/Cba-Ra/Rba)e-t/τ (3)
Where τ represents the defect charge time constant, τ=r bRa/(RbaCba).
From C a/Cba being much smaller than R a/Rba, formula (3) can be simplified to:
Ub(t)＝Rb/Rba(1-e-t/τ)U0 (4)
The occurrence instants t can thus be set randomly, followed by a peak-time sequence (q-t), q=c b*Ub. Dc TPRPD spectra q (i) -t (i), i.e., peak-time series, with the abscissa representing the time of occurrence t (i) and the ordinate representing the discharge q (i). An example of a dc TPRPD spectrum is shown in figure 3.
(2) The current pulse-time sequence generator is used for generating a corresponding transient current pulse group according to the reference direct current TPRPD spectrogram.
The current pulse-time sequence generator can generate corresponding transient current pulse groups according to a direct current TPRPD spectrogram, generate corresponding peak-time distribution characteristics, select all single transient current pulses which meet the conditions that the rising edge time corresponding to the peak value is less than 10ns, the half-peak width time is less than 50ns and the duration is less than 100ns, form the transient current pulse groups, namely the current pulse-time sequence, and output the transient current pulse groups to the sensor. A schematic of a single transient current pulse is shown in fig. 4. The rising edge time t r, half-width time t w, peak duration t l are expressed as:
tr＝t90％-t10％ (5)
tw＝t50％-t0 (6)
tl＝t10％'-t10％ (7)
Wherein A peak represents the peak value of the transient current pulse, t 50％ represents the corresponding 2 nd time (ns) at 0.5 of A peak, and t 0 represents the corresponding time (ns) at the apparent zero point of the transient current pulse. The linear equation formed by 90% and 10% points at the rising edge according to equation (4):
It is possible to obtain a solution,
Wherein t represents time, A represents peak value, t 10％' represents corresponding time (ns) at 0.1 x for transient current pulse peak value A peak. A 10％、A90％ represents the magnitudes of 10% and 90% respectively at the rising edge of the transient current pulse, and t 10％、t90％ represents the times of 10% and 90% respectively at the rising edge of the transient current pulse.
(3) And the inductor is connected in the test loop of the direct current electrical equipment and is used for simulating the direct current PD source to output the adjustable transient current pulse group in the test loop of the direct current electrical equipment based on the transient current pulse group injected into the inductor.
In the implementation process, an adjustable current pulse group which simulates the output of a DC PD source can be generated in a test loop of DC electrical equipment through an inductor, namely an adjustable transient current pulse-time sequence. In the implementation process, through adjusting the amplitude intensity of the transient state pulse group injected into the inductor, a corresponding adjustable transient state current pulse group is induced on a lead or a grounding wire of a test loop of the direct current electrical equipment, and the amplitude intensity of the transient state pulse group can be adjusted in a mode of 5pC-50pC-500 pC.
Preferably, the inductor is an ultra-wideband current transformer that is compatible with ultra-wideband (high frequency) based PD detection instruments or ultra-wideband current transformers employed in on-line monitoring systems. For example, the ultra-wideband current transformer may be a rogowski coil, and the operating frequency band may be set to 20 khz-50 mhz. Common inductors mainly comprise a clamping type rogowski coil, a high-frequency current transformer (HFCT) and a flexible and windable current transformer. In the implementation process, the method can be adaptively selected according to actual conditions, so that the wires or the grounding wires of the equipment body are conveniently arranged in a penetrating mode, and when transient current pulse groups are injected into the inductor, corresponding adjustable transient current pulse groups are induced on the wires or the grounding wires of a test loop of the direct current electrical equipment.
Preferably, the generating system in this embodiment further includes a mobile terminal and a communication module, where the mobile terminal is connected to the central processor through the communication module, and the mobile terminal is configured to store an algorithm file of the abc equivalent model in advance and transmit the algorithm file to the central processor through the communication module.
In addition, the generating system in the embodiment may further include a power module and a man-machine interaction module. The power module is used for supplying power to the man-machine interaction module, the central processing unit, the current pulse-time sequence generator and the communication module, and can be charged by a common USB interface and the like. And the man-machine interaction module is used for acquiring and displaying the states of the power supply module, the central processing unit, the current pulse-time sequence generator and the communication module.
In order to facilitate practical application, the power module, the man-machine interaction module, the central processing unit, the current pulse-time sequence generator and the communication module form an integrated device, and the integrated device is connected with the sensor through a coaxial cable and is connected with the mobile terminal through a wireless or wired communication module. At this time, a schematic structural diagram of the generating system is shown in fig. 5.
In the practical application process, the man-machine interaction module can be used for acquiring and displaying the states of the power module, the central processing unit, the current pulse-time sequence generator and the communication module, and is also used for providing a man-machine interaction interface so that a user can set the states of the integrated device and provide corresponding display values for the states of the integrated device, wherein the display values comprise the electric quantity of the power module, the current pulse-time sequence generator, the working states of the communication module and the like, and can also provide manual input means when the communication module and the mobile terminal cannot communicate, such as the state settings of restarting of the integrated device, pause, restarting, cycle repetition and the like of the integrated device. In addition, the communication module supports the data interaction between the integrated device and the mobile terminal, so that the user can know the overall state of the integrated device based on the mobile terminal, set parameters, control a system and the like, and the data communication can be realized by wired (I/O serial or parallel interfaces, optical fibers and the like) and wireless (such as Rola, wifi and the like) modes. The mobile terminal can be a mobile intelligent device which is provided with intelligent mobile phones, flat plates, notebook computers and the like which can be conveniently carried and keep data communication software with the integrated device, and the software installed on the mobile terminal can load a direct current TARPD spectrogram constructed by an algorithm file of an abc equivalent model, so that the mobile terminal is convenient for operators to observe. In addition, the central processor may be equipped with many different additional functions, such as device self-testing, self-diagnostics, external environmental parameter monitoring, external process control recording, and data storage, in addition to supporting the primary data processing functions of the integrated device.
The embodiment 2 of the invention discloses a device detection method based on a portable direct-current partial discharge current pulse group generation system, wherein a flow chart is shown in fig. 6, and the device detection method comprises the following steps.
And S1, taking a PD detection instrument or an online monitoring system used in an actual detection scene of the direct current electrical equipment as tested equipment, and matching an inductor according to the tested equipment.
Specifically, in the present embodiment, the dc electrical device may be a converter transformer and a dc cable. Under the actual detection scene of the direct current electrical equipment, an inductor can be selected according to the actual situation of a PD detection instrument or an online monitoring system used by an ultra-wideband method (including a high-frequency method). Preferably, if the tested system comprises a plurality of ultra-wideband current transformers, one of the ultra-wideband current transformers is selected as an inductor, and if the tested system only comprises one ultra-wideband current transformer, one clamping ultra-wideband current transformer is configured as an inductor.
In a specific implementation process, in general, for a PD detection instrument or an online monitoring system, if the PD detection instrument or the online monitoring system comprises a plurality of ultra-wideband current transformers, one of the ultra-wideband current transformers is selected as an inductor, the rest of the ultra-wideband current transformers are connected with a tested device to be tested, the device detection connection relationship at the moment is shown in fig. 7, and if the PD detection instrument or the online monitoring system only comprises 1 ultra-wideband current transformer, a clamping ultra-wideband current transformer can be configured as the inductor, and the device detection connection relationship at the moment is shown in fig. 8.
And S2, loading an algorithm file of an abc equivalent model by the central processing unit, constructing a reference direct current TARPD spectrogram, generating a transient current pulse group by the current pulse-time sequence generator, and outputting the transient current pulse group to the sensor.
And S3, the inductor simulates a DC PD source to output an adjustable transient current pulse group in a test loop of the DC electrical equipment based on the received transient current pulse group.
In the implementation process, the maximum amplitude (peak value) of the transient current pulse group can be adjusted according to the discharge quantity of 5pC, 50pC and 500pC, so that an adjustable transient current pulse group which simulates the generation of a DC PD source is formed in a test loop of DC electrical equipment.
And S4, the tested equipment detects the adjustable transient current pulse group, records a test direct current PRPD spectrogram, and judges whether the tested equipment works normally or not by comparing the reference direct current TARPD spectrogram with the test direct current PRPD spectrogram.
In the specific implementation process, the difference between the reference DC TARPD spectrogram and the test DC PRPD spectrogram can be compared according to a given discrimination basis, if the difference between the reference DC TARPD spectrogram and the test DC PRPD spectrogram is not higher than a preset difference threshold, the detected equipment is indicated to detect the air gap defect and work normally, the requirement of PD detection can be met, and otherwise, the detected equipment works abnormally and cannot meet the requirement of PD detection. By way of example, a given criterion may be that both have a cumulative deviation (discharge amount deviation) and (time deviation) of not more than 5% at all time points on the map.
In addition, in the implementation process, after the step S1, the step of transmitting the algorithm file of the abc equivalent model to the integrated device by using the mobile terminal can be added.
Based on the above equipment detection mode, whether the tested equipment (namely the direct current PD detection instrument or the online monitoring system of the direct current electrical equipment) can work normally or not can be conveniently and rapidly judged, and the direct current PD detection requirement is met.
Those skilled in the art will appreciate that all or part of the flow of the methods of the embodiments described above may be accomplished by way of a computer program to instruct associated hardware, where the program may be stored on a computer readable storage medium. Wherein the computer readable storage medium is a magnetic disk, an optical disk, a read-only memory or a random access memory, etc.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention.
Claims (10)
1. A portable DC partial discharge current pulse group generating system is characterized by comprising a central processing unit, a current pulse-time sequence generator and an inductor, wherein,
The central processing unit is used for loading an algorithm file of the abc equivalent model and constructing a reference direct current TPRPD spectrogram;
the current pulse-time sequence generator is used for generating a corresponding transient current pulse group according to the reference direct current TPRPD spectrogram;
and the inductor is connected in the test loop of the direct current electrical equipment and is used for simulating the direct current PD source to output the adjustable transient current pulse group in the test loop of the direct current electrical equipment based on the transient current pulse group injected into the inductor.
2. The portable direct current partial discharge current pulse train generation system of claim 1, wherein the abc equivalent model refers to an abc equivalent model of an internal insulation defect air gap of a direct current electrical device.
3. The portable direct current partial discharge current pulse train generating system according to claim 2, wherein the corresponding adjustable transient current pulse train is induced on a wire or ground wire of a test loop of the direct current electrical equipment by adjusting the magnitude intensity of the transient pulse train injected into the inductor.
4. The portable direct current partial discharge current pulse train generating system of claim 3, wherein the inductor is an ultra wideband current transformer.
5. The portable direct current partial discharge current pulse train generating system according to claim 4, further comprising a mobile terminal and a communication module, wherein the mobile terminal is connected to the central processing unit via the communication module,
The mobile terminal is used for storing the algorithm file of the abc equivalent model in advance and transmitting the algorithm file to the central processing unit through the communication module.
6. The portable direct current partial discharge current pulse train generating system according to claim 5, further comprising a power module and a human-computer interaction module, wherein,
The power module is used for supplying power to the man-machine interaction module, the central processing unit, the current pulse-time sequence generator and the communication module;
the man-machine interaction module is used for acquiring and displaying states of the power supply module, the central processing unit, the current pulse-time sequence generator and the communication module.
7. The system of claim 6, wherein the power module, the man-machine interaction module, the central processing unit, the current pulse-time sequence generator and the communication module form an integrated device, the integrated device is connected with the inductor through a coaxial cable, and is connected with the mobile terminal through a wireless or wired communication module.
8. A device detection method based on the portable direct current partial discharge current pulse train generating system according to any one of claims 1 to 7, characterized in that the device detection method comprises:
taking a PD detection instrument or an online monitoring system used by the direct current electrical equipment in an actual detection scene as tested equipment, and matching an inductor according to the tested equipment;
the central processing unit loads an algorithm file of the abc equivalent model, builds a reference direct current TARPD spectrogram, generates transient current pulse groups by the current pulse-time sequence generator, and outputs the transient current pulse groups to the sensor;
The inductor simulates a DC PD source to output an adjustable transient current pulse group in a test loop of DC electrical equipment based on the received transient current pulse group;
and judging whether the tested equipment works normally or not by comparing the reference DC TARPD spectrogram with the test DC PRPD spectrogram.
9. The portable direct current partial discharge current pulse train generation system based device detection method according to claim 8, wherein the performing according to the device under test with the sensor is performed by:
If the tested system only has one ultra-wideband current transformer, one clamping ultra-wideband current transformer is configured as the inductor.
10. The device detection method based on the portable direct current partial discharge current pulse group generating system according to claim 8 or 9, wherein the determining whether the device under test works normally by comparing the reference direct current TARPD spectrogram with the test direct current PRPD spectrogram is performed by:
And comparing the difference between the reference DC TARPD spectrogram and the test DC PRPD spectrogram according to a given discrimination basis, if the difference between the reference DC TARPD spectrogram and the test DC PRPD spectrogram is not higher than a preset difference threshold value, indicating that the tested equipment works normally, and otherwise, judging that the tested equipment works abnormally.
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| CN214310758U (en) * | 2021-01-26 | 2021-09-28 | 国网福建省电力有限公司厦门供电公司 | Partial discharge phase atlas pulse simulation system |
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