CN111208465A - Self-checking circuit for fault arc detection device and fault arc self-checking method - Google Patents
Self-checking circuit for fault arc detection device and fault arc self-checking method Download PDFInfo
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Abstract
本发明提供了一种用于故障电弧检测装置的自检电路及故障电弧自检方法，用于故障电弧检测装置的自检电路包括：高频自检电路和低频自检电路；高频自检电路包括滤波电路和第一自检电路，滤波电路对带负载通电的情况下的故障电弧电路滤除负载工频电路的影响，第一自检电路对带负载通电情况下的故障电弧电路进行高频自检；低频自检电路包括第二自检电路，第二自检电路对带负载通电情况下的故障电弧电路进行低频自检。解决了用于故障电弧检测装置的自检电路在断电的情况下自检，自检准确率低的问题。通过设置的高频自检电路和低频自检电路，在带负载通电时，对待测电路的低频、高频信号自检，滤波电路在检测高频时排除低频信号的影响，自检精准度高。
The invention provides a self-inspection circuit and a fault arc self-inspection method for a fault arc detection device. The self-inspection circuit for a fault arc detection device includes: a high-frequency self-inspection circuit and a low-frequency self-inspection circuit; a high-frequency self-inspection circuit The circuit includes a filter circuit and a first self-inspection circuit. The filter circuit filters out the influence of the load power frequency circuit on the fault arc circuit under the condition of energization with load, and the first self-inspection circuit performs high frequency self-inspection; the low-frequency self-inspection circuit includes a second self-inspection circuit, and the second self-inspection circuit performs low-frequency self-inspection on the fault arc circuit under the condition of energizing with load. The self-inspection circuit used for the fault arc detection device is self-inspection in the case of power failure, and the problem of low self-inspection accuracy is solved. Through the set high-frequency self-test circuit and low-frequency self-test circuit, when the load is powered on, the low-frequency and high-frequency signals of the circuit to be tested are self-tested, and the filter circuit eliminates the influence of low-frequency signals when detecting high frequencies, and the self-test accuracy is high. .
Description
Technical Field
The invention belongs to the technical field of power electrical equipment, and particularly relates to a self-checking circuit for a fault arc detection device and a fault arc self-checking method.
Background
The arc is a gas ionization discharge phenomenon, and is also a plasma. The arc is characterized by high temperature, low current and short duration. When the arc is generated, a large amount of heat is released, and surrounding flammable and explosive materials can be ignited, so that fire and even explosion can be caused. The electric arcs on the line can be divided into two types, one is a normal operation arc and is called a 'good arc'; the other is a fault arc, called a 'broken arc'.
The fault arc detection device can detect the fault arc generated on the line, and can avoid the harm brought by the fault arc. The existing fault arc detection device needs to be self-checked before and after being used, the existing self-checking mode is single, the fault arc detection device is carried out under the condition of power failure, the power frequency influence of a load cannot be eliminated, and the fault arc detection device is difficult to accurately judge the quality of the fault arc detection device.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a self-checking circuit for a fault arc detection device and a fault arc self-checking method, and solves the problems that the existing self-checking circuit for the fault arc detection device can only carry out self-checking under the condition of power failure, cannot eliminate the influence of load power frequency, and has low self-checking accuracy.
To achieve the above object, the present invention provides a self-test circuit for a fault arc detection device, comprising: the high-frequency self-checking circuit and the low-frequency self-checking circuit;
the high-frequency self-checking circuit comprises a filter circuit and a first self-checking circuit, wherein the filter circuit is used for filtering the influence of a load power frequency circuit by a fault arc circuit under the condition of electrifying a load, and the first self-checking circuit is used for carrying out high-frequency self-checking on the fault arc circuit under the condition of electrifying the load;
the low-frequency self-checking circuit comprises a second self-checking circuit, and the second self-checking circuit is used for performing low-frequency self-checking on a fault arc circuit under the condition that a load is electrified.
Optionally, the system further comprises a control chip, a first circuit board and a second circuit board;
the first circuit board and the second circuit board are arranged in an up-and-down inserting mode;
the control chip, the high-frequency self-checking circuit and the low-frequency self-checking circuit are arranged on the first circuit board.
Further, the power supply circuit is also included;
the power circuit is connected to the second circuit board.
Further, the power supply circuit includes a power supply voltage conversion circuit, a communication power supply voltage circuit, and a protection circuit.
Optionally, the communication device further comprises a communication selection circuit;
the communication selection circuit is connected with a port corresponding to the communication selection circuit on the control chip, and the communication selection circuit is arranged on the second circuit board.
Further, the communication selection circuit comprises a CAN communication circuit, a 485 communication circuit and a protection circuit.
Optionally, the filter circuit includes a capacitor bank and a resistor bank connected.
Furthermore, the device also comprises an audible and visual alarm circuit.
Optionally, the sound and light alarm circuit includes a display lamp alarm circuit and a buzzer alarm circuit.
Optionally, the system further comprises a reset button circuit and a self-test start button circuit;
the reset button circuit and the self-checking starting button circuit are respectively connected with interfaces corresponding to the control chip.
The invention provides a fault arc self-checking method, which comprises the steps that a simulated pulse signal is input to the input end of a fault arc detection device and passes through the self-checking of a high-frequency self-checking circuit, a low-frequency self-checking circuit and an acousto-optic alarm circuit in a power-on state;
when high-frequency self-checking is carried out, a low-frequency pulse signal of a load is filtered through a filter circuit.
The invention relates to a self-checking circuit for a fault arc detection device and a fault arc self-checking method, wherein the high-frequency self-checking circuit comprises a filter circuit and a first self-checking circuit, the filter circuit is used for filtering the influence of a load power frequency circuit on the fault arc circuit under the condition of electrifying a load, and the first self-checking circuit is used for carrying out high-frequency self-checking on the fault arc circuit under the condition of electrifying the load; the low-frequency self-checking circuit comprises a second self-checking circuit, and the second self-checking circuit is used for carrying out low-frequency self-checking on a fault arc circuit under the condition that a load is electrified; the method comprises the steps of transmitting a simulated pulse signal of the fault arc to an input end of a self-checking circuit of the fault arc detection device, carrying out high-frequency and low-frequency self-checking on the fault arc circuit of the fault arc detection device electrified to a load by arranging a high-frequency self-checking circuit and a low-frequency self-checking circuit on the simulated pulse signal, eliminating the influence of the low-frequency signal when the high-frequency self-checking is carried out under the condition that the load is electrified by a filter circuit of the high-frequency self-checking circuit, and finally judging the quality of the fault arc detection device by comparing the output pulse signal with the simulated signal, wherein the self-checking accuracy of the arc self-checking.
Drawings
Fig. 1 is a circuit diagram of a high frequency self-test circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a low frequency self-test circuit according to an embodiment of the present invention;
FIG. 3 is a circuit diagram of a control chip according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a power supply voltage converting circuit of the power supply circuit according to the embodiment of the invention;
fig. 5 is a circuit diagram of a power supply voltage circuit for communication of a power supply circuit according to an embodiment of the present invention;
fig. 6 is a circuit diagram of a protection circuit of a power circuit according to an embodiment of the invention;
fig. 7 is a circuit diagram of a CAN communication circuit according to an embodiment of the present invention;
fig. 8 is a circuit diagram of a 485 communication circuit provided by an embodiment of the present invention;
FIG. 9 is a circuit diagram of a display lamp alarm circuit according to an embodiment of the present invention;
FIG. 10 is a circuit diagram of a buzzer warning circuit provided in an embodiment of the present invention;
FIG. 11 is a circuit diagram of a reset button circuit provided by an embodiment of the present invention;
fig. 12 is a circuit diagram of a self-test start button circuit according to an embodiment of the invention.
11. A high frequency self-test circuit; 12. a low frequency self-checking circuit; 13. a control chip; 14. a power supply circuit; 15. a communication selection circuit; 16. an audible and visual alarm circuit; 17. a reset button circuit; 18. a self-checking start button circuit; 111. a filter circuit; 112. a first self-checking circuit; 113. a capacitor bank; 114. a resistor group; 121. a second self-checking circuit; 141. a power supply voltage conversion circuit; 142. a power supply voltage circuit for communication; 143. a protection circuit; 151. a CAN communication circuit; 152. 485 communication circuitry; 161. a display lamp alarm circuit; 162. buzzer alarm circuit.
Detailed Description
The self-checking circuit and the self-checking method for fault arc detection device according to the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a circuit diagram of a high frequency self-test circuit according to an embodiment of the present invention; fig. 2 is a circuit diagram of a low frequency self-test circuit according to an embodiment of the present invention; FIG. 3 is a circuit diagram of a control chip according to an embodiment of the present invention; fig. 4 is a circuit diagram of a power supply voltage converting circuit of the power supply circuit according to the embodiment of the invention; fig. 5 is a circuit diagram of a power supply voltage circuit for communication of a power supply circuit according to an embodiment of the present invention; fig. 6 is a circuit diagram of a protection circuit of a power circuit according to an embodiment of the invention; fig. 7 is a circuit diagram of a CAN communication circuit according to an embodiment of the present invention; fig. 8 is a circuit diagram of a 485 communication circuit provided by an embodiment of the present invention; FIG. 9 is a circuit diagram of a display lamp alarm circuit according to an embodiment of the present invention; FIG. 10 is a circuit diagram of a buzzer warning circuit provided in an embodiment of the present invention; FIG. 11 is a circuit diagram of a reset button circuit provided by an embodiment of the present invention; fig. 12 is a circuit diagram of a self-test start button circuit according to an embodiment of the invention.
As shown in fig. 1 to 12, a self-test circuit for a fault arc detection device according to an embodiment of the present invention includes: a high-frequency self-test circuit 11 and a low-frequency self-test circuit 12; the high-frequency self-checking circuit 11 comprises a filter circuit 111 and a first self-checking circuit 112, wherein the filter circuit 111 is used for filtering the influence of a load power frequency circuit by a fault arc circuit under the condition of electrifying a live load, and the first self-checking circuit 112 is used for carrying out high-frequency self-checking on the fault arc circuit under the condition of electrifying the live load; the low frequency self-checking circuit 12 includes a second self-checking circuit 121, and the second self-checking circuit 121 is used for performing low frequency self-checking on a fault arc circuit in the case of electrifying a live load.
The method comprises the steps of transmitting a simulated pulse signal of the fault arc to an input end of a self-checking circuit for the fault arc detection device, carrying out high-frequency and low-frequency self-checking on the fault arc circuit of the fault arc detection device electrified to a load through a high-frequency self-checking circuit 11 and a low-frequency self-checking circuit 12, eliminating the influence of the low-frequency signal when the high-frequency self-checking is carried out under the condition that the load is electrified through a filter circuit 111 of the high-frequency self-checking circuit 11, finally judging the quality of the fault arc detection device through comparing the output pulse signal with the analog signal, and enabling the self-checking accuracy of the arc self-checking device to be high.
The self-checking circuit for the fault arc detection device provided by the invention can perform self-checking on the fault arc detection device under the condition that a load is electrified, and can perform self-checking on the fault arc detection device respectively and sequentially through the high-frequency self-checking circuit 11 and the high-frequency self-checking circuit 11, it is worth mentioning that the high-frequency self-checking circuit 11 is provided with the filter circuit 111, and the filter circuit 111 can eliminate the influence of low-frequency signals generated by the load, so that the problem of poor precision of self-checking results is avoided.
The low-frequency self-checking circuit 12 may also be provided with a filter circuit 111, which is used to eliminate the influence of the high-frequency signal generated by the load in the power-on state, so as to avoid the problem of poor precision of the self-checking result.
It should be noted that the self-checking circuit for the arc fault detection device provided by the invention can perform self-checking on the single-phase arc fault detection device and the three-phase arc fault detection device respectively.
Optionally, the system further comprises a control chip 13, a first circuit board and a second circuit board; the first circuit board and the second circuit board are arranged in an up-and-down inserting mode; the control chip 13, the high-frequency self-checking circuit 11 and the low-frequency self-checking circuit 12 are arranged on the first circuit board.
The first circuit board and the second circuit board are connected up and down in an inserted mode to achieve communication of all functional circuits of the arc self-checking device, the chip, the high-frequency self-checking circuit 11 and the low-frequency self-checking circuit 12 are arranged on the first circuit board and can be communicated with a power circuit 14 arranged on the second circuit board, and smooth sequential self-checking of the whole self-checking circuit for the fault arc detection device is achieved.
The first circuit board and the second circuit board are sequentially arranged from top to bottom and are connected in an inserting mode, functional circuits fixed on the first circuit board and the second circuit board are communicated, and sequential function detection is carried out.
Further, a power supply circuit 14 is included; the power supply circuit 14 is connected to the second circuit board.
The self-test circuit for the arc fault detection apparatus as a whole is supplied with power by the included power supply circuit 14 so that the self-test operation of the self-test circuit for the arc fault detection apparatus is performed under power-on.
Further, the power supply circuit 14 includes a power supply voltage conversion circuit 141, a communication power supply voltage circuit 142, and a protection circuit 143.
The conversion of the power supply voltage is realized through the arranged power supply voltage conversion circuit 141, and the power supply requirement of the actual fault arc self-checking operation is met; the power supply required by communication is supplied through the arranged communication power supply voltage circuit 142; the power output is protected through the protection power supply, and the stability of the power output is realized.
Optionally, a communication selection circuit 15 is further included; the communication selection circuit 15 is connected with a port corresponding to the communication selection circuit 15 on the control chip 13, and the communication selection circuit 15 is arranged on the second circuit board.
The communication selection circuit 15 is arranged on the second circuit board through the connection of the arranged communication selection circuit 15 and the port, corresponding to the communication selection circuit 15 on the control chip 13, so that the communication connection between the self-checking circuit for the fault arc detection device and an external upper computer display mechanism is realized, and the self-checking result of the self-checking circuit for the fault arc detection device is quickly transmitted and displayed.
Further, the communication selection circuit 15 includes a CAN communication circuit 151, a 485 communication circuit 152, and a protection circuit 143.
The communication selection circuit comprises the CAN communication circuit 151, the 485 communication circuit 152 and the protection circuit 143, so that the self-checking circuit for the fault arc detection device CAN adapt to communication requirements under various communication protocols, and various use requirements are met.
Optionally, the filter circuit 111 includes a capacitor bank 113 and a resistor bank 114 connected to each other.
By arranging the filter circuit 111 to include the capacitor bank 113 and the resistor bank 114, the capacitor bank 113 and the resistor bank 114 increase the power supply quality and improve the communication reliability.
Further, an acousto-optic alarm circuit 16 is also included.
Optionally, the acousto-optic warning circuit 16 includes a display lamp warning circuit 161 and a buzzer warning circuit 162.
Through the display lamp alarm circuit 161 and the buzzer alarm circuit 162, when the fault arc detection device is detected, light alarm and buzzer alarm can be rapidly sent out when fault arcs are generated, the alarm signal is obvious, and the alarm effect is good.
Optionally, a reset button circuit 17 and a self-test start button circuit 18 are further included; the reset button circuit 17 and the self-test start button circuit 18 are respectively connected with their corresponding interfaces on the control chip 13.
Through the reset button circuit 17, the reset button circuit 17 is started when the button is manually reset, so that the reset operation of the self-checking circuit of the fault arc detection device is realized, and the repeated circulating resettable operation is realized; through the self-checking start button circuit 18 who sets up, when realizing manual self-checking start button, self-checking start circuit starts, realizes being used for trouble arc detection device's self-checking circuit's self-checking to start, realizes intelligent start and quick start, improves the result of use.
The reset button and the self-test starting button can be buttons with different colors so as to distinguish the two buttons.
The reset button and the self-checking start button are both connected with the control chip 13, so that when the button is manually operated, the control chip 13 receives signals and transmits control signals to the reset button or the self-checking start button, and automatic control starting and resetting self-checking are achieved.
The invention has disclosed a trouble electric arc self-checking method, input the pulse signal simulated to the input end of the detection device of the trouble electric arc, pass the self-checking of high-frequency self-checking circuit 11, low-frequency self-checking circuit 12 and acousto-optic warning circuit 16 under the state of the circular telegram; when the high frequency self-test is performed, a low frequency pulse signal of the load is filtered through the filter circuit 111.
The invention utilizes the self-checking circuit for the fault arc detection device to detect the fault arc of the fault arc detection device, and the self-checking circuit for the fault arc detection device comprises an audible and visual alarm circuit 16, a low-frequency self-checking circuit 12 and a high-frequency self-checking circuit 11.
Each circuit detection part pipeline is sequentially executed, a self-checking starting button is clicked to enter a self-checking starting button circuit, a reset button is clicked to enter a reset button circuit 17, and after the self-checking is finished, whether the current circuit has faults or not is indicated through the flashing condition of a yellow fault indicator lamp, and what faults exist, so that the field test and maintenance of equipment are facilitated.
Acousto-optic alarm circuit 16: the software self-checking function enables all LEDs to flash for 3 times and then to be normally on, and enables the buzzer to sound for 1 second and then to be static;
low-frequency self-test circuit 12: the software self-checking function generates a low-frequency simulated arc signal through the hardware testing circuit, the low-frequency simulated arc signal passes through the low-frequency self-checking circuit 12, and whether the current fault arc low-frequency detection circuit is normal or not is judged by analyzing and comparing the received simulated arc waveform;
high-frequency self-test circuit 11: the software self-checking function generates a high-frequency simulation arc signal through a hardware testing circuit, the high-frequency simulation arc signal passes through a high-frequency detection circuit, and whether the current fault arc high-frequency detection circuit is normal or not is judged by analyzing and comparing the received simulation arc waveform;
information communication bus transmission circuit: the software self-checking function can normally receive and send the arc state data bits through the electric fire host or the upper computer.
And under the condition that the fault arc detection device works normally and the power supply of the lower end loop is not cut off, the arc self-checking circuit and the software self-checking function are used for detecting whether the fault arc detection function works normally or not on line in real time. The testability and the maintainability of the product are improved.
In summary, according to the self-checking circuit for a fault arc detection device and the fault arc self-checking method provided by the present invention, a pulse signal of a simulated fault arc is transmitted to an input end of the self-checking circuit for the fault arc detection device, the simulated pulse signal is provided with the high-frequency self-checking circuit 11 and the low-frequency self-checking circuit 12, the fault arc circuit of the fault arc detection device with the load energized is subjected to high-frequency and low-frequency self-checking, the filter circuit 111 of the high-frequency self-checking circuit 11 eliminates the influence of the low-frequency signal when the high-frequency self-checking is performed with the load energized, and finally the quality of the fault arc detection device is judged by comparing the output pulse signal with the analog signal, and the self-checking accuracy of the arc self-checking device is high.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention, and all such changes or substitutions are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (11)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010089572.7A CN111208465A (en) | 2020-01-22 | 2020-01-22 | Self-checking circuit for fault arc detection device and fault arc self-checking method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010089572.7A CN111208465A (en) | 2020-01-22 | 2020-01-22 | Self-checking circuit for fault arc detection device and fault arc self-checking method |
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| CN111208465A true CN111208465A (en) | 2020-05-29 |
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| CN202010089572.7A Pending CN111208465A (en) | 2020-01-22 | 2020-01-22 | Self-checking circuit for fault arc detection device and fault arc self-checking method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113311361A (en) * | 2021-06-05 | 2021-08-27 | 温州理工学院 | Multi-functional wisdom power consumption monitor terminal |
| CN114878996A (en) * | 2022-06-14 | 2022-08-09 | 江苏纳通能源技术有限公司 | Arc detection circuit with self-checking function, device and detection method |
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| CN105629112A (en) * | 2016-02-15 | 2016-06-01 | 珠海派诺科技股份有限公司 | Fault arc detection device and method |
| CN106655075A (en) * | 2016-11-18 | 2017-05-10 | 珠海格力电器股份有限公司 | Electric equipment arc fault protection device and electric equipment control system |
| CN206930727U (en) * | 2017-06-20 | 2018-01-26 | 浙江中科城安消防科技有限公司 | A kind of fault arc detection device for gathering communication |
| CN109917241A (en) * | 2019-03-19 | 2019-06-21 | 德力西电气有限公司 | A fault arc detection method and fault arc circuit breaker |
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2020
- 2020-01-22 CN CN202010089572.7A patent/CN111208465A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105629112A (en) * | 2016-02-15 | 2016-06-01 | 珠海派诺科技股份有限公司 | Fault arc detection device and method |
| CN106655075A (en) * | 2016-11-18 | 2017-05-10 | 珠海格力电器股份有限公司 | Electric equipment arc fault protection device and electric equipment control system |
| CN206930727U (en) * | 2017-06-20 | 2018-01-26 | 浙江中科城安消防科技有限公司 | A kind of fault arc detection device for gathering communication |
| CN109917241A (en) * | 2019-03-19 | 2019-06-21 | 德力西电气有限公司 | A fault arc detection method and fault arc circuit breaker |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113311361A (en) * | 2021-06-05 | 2021-08-27 | 温州理工学院 | Multi-functional wisdom power consumption monitor terminal |
| CN114878996A (en) * | 2022-06-14 | 2022-08-09 | 江苏纳通能源技术有限公司 | Arc detection circuit with self-checking function, device and detection method |
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