Active intervention type arc-extinguishing and resonance-eliminating device and active intervention type arc-extinguishing and resonance-eliminating method

Abstract

The invention provides an active intervention type arc-extinguishing and resonance-eliminating device and method, and relates to the technical field of power system safety control, the device comprises an intelligent grounding module, the intelligent grounding module comprises a three-phase line led out from a system bus, and the three-phase line is grounded through a secondary side of a voltage transformer; a three-phase contactor and an impedance grounding transformer are sequentially connected in series between the system bus and the grounding end; when overvoltage and line resonance are caused by a non-single-phase earth fault of the power distribution network system, the PTC resonance elimination module is used for actively carrying out resonance suppression; the monitoring module is used for monitoring the working state of the device and generating state information; the processing module is used for processing the state information; and the alarm module performs a corresponding alarm action. According to the active intervention type arc and resonance elimination device and the matched fault treatment method thereof, innovative application of the intelligent grounding module and the PTC resonance elimination module is combined, and a comprehensive solution with high flexibility and self-adaptive capacity is formed.

Description

Technical Field

[0001] The present invention relates to the technical field of power system safety prevention and control, and in particular to an active intervention type arc extinguishing and harmonic elimination device and method. Background Art

[0002] With the development of economy and society, the requirements for power supply reliability are getting higher and higher. At present, the most commonly used method in the distribution network system of 10-35kV voltage level is the neutral point non-effective grounding method. The neutral point non-effective grounding method includes neutral point non-grounding, arc suppression coil grounding and small resistance grounding. The neutral point non-effective grounding method is prone to intermittent faults. Intermittent faults refer to fault states that occur intermittently, among which intermittent arc grounding faults account for a considerable proportion. Arc grounding faults refer to faults caused by unstable intermittent arcs that are extinguished and reignited many times. The main reasons are aging of insulators, moisture, and grounding of overhead lines. When intermittent arc grounding occurs, the fault point is not completely connected to the earth. The fault point is repeatedly grounded and disconnected in a very short time. This intermittent arc phenomenon will cause the power grid operation state to change instantly and cause strong oscillation of electromagnetic energy. At the same time, high-frequency oscillation overvoltage is caused in the inductance and capacitance circuits of the fault phase and the non-fault phase. At this time, the voltage amplitude of the non-fault phase can generally reach 3.15~3.5 times the phase voltage.

[0003] In modern power distribution networks, single-phase grounding faults, line resonance, and overvoltage often cause safety hazards such as equipment damage and power outages, posing severe challenges to the stable operation of power systems. When drawing power from large currents, the use of traditional arc suppression coils or small resistors has abnormal problems. Among them, arc suppression coils cannot extinguish arcs, and small resistors can cause direct tripping. Traditional fault management methods usually rely on passive protection devices, which cannot actively eliminate the harmonic interference and resonance effects caused by faults. Therefore, there is an urgent need for a solution that can detect faults in real time and actively intervene. Summary of the invention

[0004] The present invention proposes an active intervention arc extinguishing and harmonic elimination device and method, which combines the innovative application of an intelligent grounding module and a PTC harmonic elimination module to form a comprehensive solution with high flexibility and adaptability.

[0005] In order to solve the above problems, in a first aspect, the present invention provides an active intervention type arc extinguishing and harmonic elimination device, the device comprising: An intelligent grounding module, wherein the intelligent grounding module comprises a three-phase line derived from a system bus, the three-phase line is grounded through the secondary side of a voltage transformer, a three-phase contactor and an impedance grounding transformer are sequentially connected in series between the system bus and the grounding terminal, and a current transformer 1 is connected below the impedance grounding transformer; a switch circuit is connected in parallel between the three-phase contactor and the impedance grounding transformer, and a current transformer 2 is connected below the switch circuit; when a single-phase grounding fault occurs in the distribution network system, the impedance grounding transformer in the intelligent grounding module is used to suppress the resonance generated in the fault; PTC detuning module: When a non-single-phase grounding fault in the distribution network causes overvoltage and line resonance, the PTC detuning module is used to actively suppress resonance; A monitoring module is used to monitor the working status of the PTC detuning module, the intelligent grounding device and the voltage transformer, and generate status information; A processing module is used to receive status information and process the status information. If the processing result shows abnormality, an alarm signal is generated; The alarm module is used to receive alarm signals and take corresponding alarm actions.

[0006] Furthermore, the switch circuit includes auxiliary arc-extinguishing phase circuit breakers corresponding to the three-phase lines respectively, as well as a main arc-extinguishing switch and a current-limiting resistor; The main arc extinguishing switch and the current limiting resistor are connected in parallel and then connected in series with the auxiliary arc extinguishing phase circuit breaker. The auxiliary arc extinguishing phase circuit breaker and the main arc extinguishing switch are controlled by the intelligent controller to ground the fault phase circuit.

[0007] Furthermore, the PTC detuning module includes a current-sensitive detuning device and a built-in current transformer. When the current flowing through the current-sensitive detuning device increases, the resistance value of the resistor in the current-sensitive detuning device increases rapidly, thereby completing the detuning action.

[0008] Furthermore, the monitoring module includes: A current monitoring module is used to monitor the current value flowing through the current-sensitive harmonic eliminator and record the waveform, and correspondingly generate a current value change graph within a preset time period; The temperature monitoring module is used to monitor the temperature information of the impedance grounding transformer, current-sensitive harmonic eliminator and voltage transformer in the intelligent grounding device, and generate a temperature change diagram within a preset time period; Camera module for monitoring installation status information with impedance grounding transformer and current sensitive detuning device.

[0009] Furthermore, the processing module is used to analyze the current value change diagram according to a preset analysis algorithm, and the analysis result indicates whether the current value fluctuates abnormally. The specific process is as follows: Smoothing the current change curve in the current value change diagram; The current variation curve is evenly divided into n unit time period data; , The characteristic parameters of abnormal current value are obtained by calculation through formula (1)~(3) ; in, is the average current value of the current fluctuation curve; is the value of current changing with time; It is a preset standard current fluctuation curve; 、 are respectively the left and right endpoints of the preset time period; 、 are the left and right endpoints of the i-th unit time period; is the duration of the unit period; is the preset scale factor, and ; The abnormal current value characteristic parameter With preset current threshold Make a comparison judgment: like , it means that the PTC detuning module is working normally; like , it means that the working status of the PTC detuning module may be abnormal, and it is necessary to analyze the temperature information of the impedance grounding transformer, current-sensitive detuning device and voltage transformer.

[0010] Furthermore, the processing module is also used to parse the temperature information of the impedance grounding transformer, the current-sensitive harmonic eliminator and the voltage transformer. The specific process is as follows: Analyze the temperature information of the flow-sensitive detuning device to determine whether the PTC detuning module is abnormal. The abnormal temperature characteristic parameters of the flow-sensitive detuning device are obtained by the following formula: : , when hour, ; when hour, ; in, is the average temperature value of the flow-sensitive type harmonic eliminator within the preset time period, It is the maximum temperature value of the preset flow-sensitive eliminator under normal conditions. The temperature value of the flow-sensitive type harmonic eliminator exceeds the preset maximum temperature value within the preset time period. The total time, and is a preset first weight coefficient; Analyze the temperature information of the impedance transformer to determine whether the impedance transformer is abnormal. Obtain the abnormal temperature characteristic parameters of the impedance transformer through the following formula : , when hour, ; when hour, ; in, is the average temperature value of the impedance grounding transformer within the preset time period, It is the maximum temperature value of the preset impedance grounding transformer under normal conditions. The temperature value of the impedance grounding transformer exceeds the preset maximum temperature value within the preset time period. The total time, and is a preset second weight coefficient; Analyze the temperature information of the voltage transformer to determine whether the voltage transformer is abnormal. Obtain the abnormal temperature characteristic parameters of the voltage transformer through the following formula : , when hour, ; when hour, ; in, is the average temperature value of the voltage transformer within the preset time period, is the preset maximum temperature value of the voltage transformer under normal conditions, The temperature value of the voltage transformer exceeds the preset maximum temperature value within the preset time period. The total time, and is a preset third weight coefficient; pass , , Determine whether the temperature of impedance grounding transformers, current-sensitive harmonic eliminators and voltage transformers will cause damage to their own work.

[0011] Further, through , , The specific process of judging whether the temperature of impedance grounding transformer, current-sensitive harmonic eliminator and voltage transformer will cause damage to their own work is as follows: The abnormal temperature characteristic parameters of the flow-sensitive type detuning device 、Abnormal temperature characteristic parameters of impedance transformer , Abnormal temperature characteristic parameters of voltage transformer Respectively with the preset temperature threshold , , Make a comparison judgment: like , and , it is judged that the arc extinguishing and harmonic eliminating device is working normally; like or or , then the components corresponding to the abnormal temperature characteristic parameters greater than the preset temperature threshold will be alarmed and repaired; like , and If the arc extinguishing and harmonic elimination device is in an abnormal working state, an alarm will be issued to notify the staff to carry out maintenance.

[0012] In a second aspect, an active intervention type arc extinguishing and harmonic elimination method is provided, using the active intervention type arc extinguishing and harmonic elimination device, characterized in that the method comprises: During the operation of the distribution network system, the intelligent grounding module and the PTC detuning module will monitor the distribution network status in real time through the current transformer 1, the current transformer 2 and the built-in current transformer, and detect the resonance phenomenon caused by the single-phase grounding fault and the non-single-phase grounding fault; When a single-phase grounding fault is detected, the resonance generated by the fault is suppressed through the impedance transformer in the intelligent grounding module; When a non-single-phase grounding fault in the distribution network is detected, causing overvoltage and line resonance, the PTC detuning module is used to actively suppress the resonance; During the operation of the active intervention arc extinguishing and harmonic elimination device, the monitoring module monitors the working status of the PTC harmonic elimination module, the intelligent grounding device and the voltage transformer, and generates status information; The processing module receives the status information and processes the status information. If the processing result shows an abnormality, an alarm signal is generated; Receive alarm signals through the alarm module and take corresponding alarm actions.

[0013] In a third aspect, a computer-readable storage medium storing one or more programs is provided, wherein the one or more programs include instructions, which, when executed by a computing device, cause the computing device to perform the above method.

[0014] In a fourth aspect, a computing device based on an active intervention arc extinguishing and harmonic elimination method is provided, comprising: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs include instructions for executing the above method.

[0015] The present invention provides an active intervention arc extinguishing and harmonic elimination device and method, which can use the intelligent grounding module to quickly and accurately extinguish the arc and eliminate the harmonics at the single-phase grounding fault point in the distribution network in the first time; and use the PTC harmonic elimination module to actively suppress the resonance generated by the distribution network line when the intelligent grounding device is not in operation, avoid the resonance wave from affecting the distribution network, and protect the stability of the distribution network system to the greatest extent, thereby improving the power supply reliability of the distribution network.

[0016] The present invention provides an active intervention arc extinguishing and harmonic elimination device and method, which monitors the working status of a PTC harmonic elimination module, an intelligent grounding device and a voltage transformer in real time through a monitoring module, processes the status information of each component through a processing module, and generates a corresponding alarm signal after data processing to alert staff to repair the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural block diagram of the active intervention arc extinguishing and harmonic elimination device of the present invention; Figure 2 This is the circuit diagram of the intelligent grounding module of the present invention; Figure 3 This is a circuit diagram of the PTC detuning module of the present invention; Figure 4 This is a flow chart of the active intervention arc extinguishing and harmonic elimination method of the present invention. DETAILED DESCRIPTION

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0019] See also Figure 1 One embodiment of the present invention provides an active intervention type arc extinguishing and harmonic elimination device, the device comprising: An intelligent grounding module, wherein the intelligent grounding module comprises a three-phase line derived from a system bus, the three-phase line is grounded through the secondary side of a voltage transformer, a three-phase contactor and an impedance grounding transformer are sequentially connected in series between the system bus and the grounding terminal, and a current transformer 1 is connected below the impedance grounding transformer; a switch circuit is connected in parallel between the three-phase contactor and the impedance grounding transformer, and a current transformer 2 is connected below the switch circuit; when a single-phase grounding fault occurs in the distribution network system, the impedance grounding transformer in the intelligent grounding module is used to suppress the resonance generated in the fault; PTC detuning module: When a non-single-phase grounding fault in the distribution network causes overvoltage and line resonance, the PTC detuning module is used to actively suppress resonance; A monitoring module is used to monitor the working status of the PTC detuning module, the intelligent grounding device and the voltage transformer, and generate status information; A processing module is used to receive status information and process the status information. If the processing result shows abnormality, an alarm signal is generated; The alarm module is used to receive alarm signals and take corresponding alarm actions.

[0020] Furthermore, the switch circuit includes auxiliary arc-extinguishing phase circuit breakers corresponding to the three-phase lines respectively, as well as a main arc-extinguishing switch and a current-limiting resistor; The main arc extinguishing switch and the current limiting resistor are connected in parallel and then connected in series with the auxiliary arc extinguishing phase circuit breaker. The auxiliary arc extinguishing phase circuit breaker and the main arc extinguishing switch are controlled by the intelligent controller to ground the fault phase circuit.

[0021] Furthermore, the PTC detuning module includes a current-sensitive detuning device and a built-in current transformer. When the current flowing through the current-sensitive detuning device increases, the resistance value of the resistor in the current-sensitive detuning device increases rapidly, thereby completing the detuning action.

[0022] See also Figure 2The intelligent grounding module detects the system bus voltage in real time. When a single-phase grounding fault occurs in the system, in order to extinguish the arc as soon as possible to avoid escalating hazards, the controller controls the auxiliary arc-extinguishing phase circuit breaker (K1 or K2 or K3) to close the current-limiting resistor in the device, and monitors the current flowing through the current-limiting resistor and the related vector relationship; after confirming that the phase selection is correct, close the main arc-extinguishing switch to ground the faulty phase metal; if the phase selection is wrong, open the closed auxiliary arc-extinguishing phase circuit breaker, reselect the phase and complete the action; after the set delay (the preset time is 5 seconds, and the user can modify it according to actual operating experience), the three-phase contactor is closed and the grounding transformer is put into operation. After a delay of 50 milliseconds, the main arc-extinguishing switch is disconnected first, the current-limiting resistor is put into operation, and then the auxiliary arc-extinguishing phase circuit breaker (K1) is disconnected. or K2 or K3), and determine whether the grounding fault still exists; if the grounding fault has disappeared, it indicates that it is a transient single-phase grounding fault, the event is recorded, and the system resumes normal operation; if the single-phase grounding fault still exists, it indicates that it is a permanent single-phase grounding fault. At this time, due to the input of the impedance grounding transformer in the intelligent grounding module, a zero-sequence current with obvious characteristics flows through the fault branch, thereby achieving accurate line selection; after completing the line selection, continue to close the fault phase; after the fault point is restored or isolated, when remotely reset or locally installed, first close the three-phase contactor in the device, input the impedance grounding transformer, and then open the main arc extinguishing switch and auxiliary arc extinguishing phase circuit breaker (K1 or K2 or K3) switches in turn, and finally open the three-phase contactor to restore the normal operation of the system.

[0023] See also Figure 3 The neutral point of the voltage transformer is connected in series with a PTC detuning module, which consists of a current-sensitive detuning device and a built-in current transformer. The PTC detuning module is also provided with a detection module, which collects the operating status of the primary detuning module, detects the current value flowing through the primary detuning module and records the waveform. The current-sensitive detuning device uses a current-sensitive resistor, which contains zinc oxide material. When the current increases, the resistance of the current-sensitive detuning resistor increases rapidly, thereby performing rapid detuning. When the current decreases, the resistance of the current-sensitive detuning resistor also decreases, thereby avoiding affecting the operation of the system. When a non-single-phase grounding fault in the distribution network is detected to cause overvoltage and line resonance, the PTC detuning module is used to actively suppress resonance.

[0024] As a further solution of the embodiment of the invention, the monitoring module includes: A current monitoring module is used to monitor the current value flowing through the current-sensitive harmonic eliminator and record the waveform, and correspondingly generate a current value change graph within a preset time period; The temperature monitoring module is used to monitor the temperature information of the impedance grounding transformer, current-sensitive harmonic eliminator and voltage transformer in the intelligent grounding device, and generate a temperature change diagram within a preset time period; Camera module for monitoring installation status information with impedance grounding transformer and current sensitive detuning device.

[0025] Furthermore, the processing module is used to analyze the current value change diagram according to a preset analysis algorithm, and the analysis result indicates whether the current value fluctuates abnormally. The specific process is as follows: Smoothing the current change curve in the current value change diagram; The current variation curve is evenly divided into n unit time period data; , The characteristic parameters of abnormal current value are obtained by calculation through formula (1)~(3) ; in, is the average current value of the current fluctuation curve; is the value of current changing with time; It is a preset standard current fluctuation curve; 、 are respectively the left and right endpoints of the preset time period; 、 are the left and right endpoints of the i-th unit time period; is the duration of the unit period; is the preset scale factor, and ; The abnormal current value characteristic parameter With preset current threshold Make a comparison judgment: like , it means that the PTC detuning module is working normally; like , it means that the working status of the PTC detuning module may be abnormal, and it is necessary to analyze the temperature information of the impedance grounding transformer, current-sensitive detuning device and voltage transformer.

[0026] Furthermore, the processing module is also used to parse the temperature information of the impedance grounding transformer, the current-sensitive harmonic eliminator and the voltage transformer. The specific process is as follows: Analyze the temperature information of the flow-sensitive detuning device to determine whether the PTC detuning module is abnormal. The abnormal temperature characteristic parameters of the flow-sensitive detuning device are obtained by the following formula: : , when hour, ; when hour, ; in, is the average temperature value of the flow-sensitive type harmonic eliminator within the preset time period, It is the maximum temperature value of the preset flow-sensitive eliminator under normal conditions. The temperature value of the flow-sensitive type harmonic eliminator exceeds the preset maximum temperature value within the preset time period. The total time, and is a preset first weight coefficient; Analyze the temperature information of the impedance transformer to determine whether the impedance transformer is abnormal. Obtain the abnormal temperature characteristic parameters of the impedance transformer through the following formula : , when hour, ; when hour, ; in, is the average temperature value of the impedance grounding transformer within the preset time period, It is the maximum temperature value of the preset impedance grounding transformer under normal conditions. The temperature value of the impedance grounding transformer exceeds the preset maximum temperature value within the preset time period. The total time, and is a preset second weight coefficient; Analyze the temperature information of the voltage transformer to determine whether the voltage transformer is abnormal. Obtain the abnormal temperature characteristic parameters of the voltage transformer through the following formula : , when hour, ; when hour, ; in, is the average temperature value of the voltage transformer within the preset time period, is the preset maximum temperature value of the voltage transformer under normal conditions, The temperature value of the voltage transformer exceeds the preset maximum temperature value within the preset time period. The total time, and is a preset third weight coefficient; pass , , Determine whether the temperature of impedance grounding transformers, current-sensitive harmonic eliminators and voltage transformers will cause damage to their own work.

[0027] Further, through , , The specific process of judging whether the temperature of impedance grounding transformer, current-sensitive harmonic eliminator and voltage transformer will cause damage to their own work is as follows: The abnormal temperature characteristic parameters of the flow-sensitive type detuning device 、Abnormal temperature characteristic parameters of impedance transformer , Abnormal temperature characteristic parameters of voltage transformer Respectively with the preset temperature threshold , , Make a comparison judgment: like , and , it is judged that the arc extinguishing and harmonic eliminating device is working normally; like or or , then the components corresponding to the abnormal temperature characteristic parameters greater than the preset temperature threshold will be alarmed and repaired; like , and If the arc extinguishing and harmonic elimination device is in an abnormal working state, an alarm will be issued to notify the staff to carry out maintenance.

[0028] See also Figure 4 Another embodiment of the present invention provides an active intervention type arc extinguishing and harmonic elimination method, using the active intervention type arc extinguishing and harmonic elimination device, characterized in that the method comprises: During the operation of the distribution network system, the intelligent grounding module and the PTC detuning module will monitor the distribution network status in real time through the current transformer 1, the current transformer 2 and the built-in current transformer, and detect the resonance phenomenon caused by the single-phase grounding fault and the non-single-phase grounding fault; When a single-phase grounding fault is detected, the resonance generated by the fault is suppressed through the impedance transformer in the intelligent grounding module; When a non-single-phase grounding fault in the distribution network is detected, causing overvoltage and line resonance, the PTC detuning module is used to actively suppress the resonance; In order to monitor the entire active intervention arc extinguishing and harmonic elimination device, and ensure that problems with the active intervention arc extinguishing and harmonic elimination device can be discovered and repaired in time: During the operation of the active intervention arc extinguishing and harmonic elimination device, the monitoring module monitors the working status of the PTC harmonic elimination module, the intelligent grounding device and the voltage transformer, and generates status information; The processing module receives the status information and processes the status information. If the processing result shows an abnormality, an alarm signal is generated; Receive alarm signals through the alarm module and take corresponding alarm actions.

[0029] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. An active intervention arc extinguishing and harmonic elimination device, characterized in that: The device comprises: An intelligent grounding module, wherein the intelligent grounding module comprises a three-phase line derived from a system bus, the three-phase line is grounded through the secondary side of a voltage transformer, a three-phase contactor and an impedance grounding transformer are sequentially connected in series between the system bus and the grounding terminal, and a current transformer 1 is connected below the impedance grounding transformer; a switch circuit is connected in parallel between the three-phase contactor and the impedance grounding transformer, and a current transformer 2 is connected below the switch circuit; when a single-phase grounding fault occurs in the distribution network system, the impedance grounding transformer in the intelligent grounding module is used to suppress the resonance generated in the fault; PTC detuning module: When a non-single-phase grounding fault in the distribution network causes overvoltage and line resonance, the PTC detuning module is used to actively suppress resonance; A monitoring module is used to monitor the working status of the PTC detuning module, the intelligent grounding device and the voltage transformer, and generate status information; A processing module is used to receive status information and process the status information. If the processing result shows abnormality, an alarm signal is generated; The alarm module is used to receive alarm signals and take corresponding alarm actions.

2. The active intervention arc extinguishing and harmonic elimination device according to claim 1, characterized in that: The switch circuit comprises auxiliary arc-extinguishing phase-splitting circuit breakers corresponding to the three-phase lines respectively, as well as a main arc-extinguishing switch and a current-limiting resistor; The main arc extinguishing switch and the current limiting resistor are connected in parallel and then connected in series with the auxiliary arc extinguishing phase circuit breaker. The auxiliary arc extinguishing phase circuit breaker and the main arc extinguishing switch are both controlled by a controller to ground the fault phase circuit.

3. The active intervention arc extinguishing and harmonic elimination device according to claim 2, characterized in that: The PTC detuning module includes a current-sensitive detuning device and a built-in current transformer. When the current flowing through the current-sensitive detuning device increases, the resistance value of the resistor in the current-sensitive detuning device increases rapidly, thereby completing the detuning action.

4. The active intervention arc extinguishing and harmonic elimination device according to claim 3, characterized in that: The monitoring module comprises: A current monitoring module is used to monitor the current value flowing through the current-sensitive harmonic eliminator and record the waveform, and correspondingly generate a current value change graph within a preset time period; The temperature monitoring module is used to monitor the temperature information of the impedance grounding transformer, current-sensitive harmonic eliminator and voltage transformer in the intelligent grounding device, and generate a temperature change diagram within a preset time period; Camera module for monitoring installation status information with impedance grounding transformer and current sensitive detuning device.

5. The active intervention arc extinguishing and harmonic elimination device according to claim 4, characterized in that: The processing module is used to analyze the current value change diagram according to a preset analysis algorithm, and the analysis result indicates whether the current value fluctuates abnormally. The specific process is as follows: Smoothing the current change curve in the current value change diagram; The current variation curve is evenly divided into n unit time period data; ， The characteristic parameters of abnormal current value are obtained by calculation through formula (1)~(3) ; in, is the average current value of the current fluctuation curve; is the value of current changing with time; It is a preset standard current fluctuation curve; 、 are respectively the left and right endpoints of the preset time period; 、 are the left and right endpoints of the i-th unit time period; is the duration of the unit period; is the preset scale factor, and ; The abnormal current value characteristic parameter With preset current threshold Make a comparison judgment: like , it means that the PTC detuning module is working normally; like , it means that the working status of the PTC detuning module may be abnormal, and it is necessary to analyze the temperature information of the impedance grounding transformer, current-sensitive detuning device and voltage transformer.

6. The active intervention arc extinguishing and harmonic elimination device according to claim 5, characterized in that: The processing module is also used to analyze the temperature information of the impedance grounding transformer, the current-sensitive harmonic eliminator and the voltage transformer. The specific process is as follows: Analyze the temperature information of the flow-sensitive detuning device to determine whether the PTC detuning module is abnormal. The abnormal temperature characteristic parameters of the flow-sensitive detuning device are obtained by the following formula: : ， when hour, ; when hour, ; in, is the average temperature value of the flow-sensitive type harmonic eliminator within the preset time period, It is the maximum temperature value of the preset flow-sensitive eliminator under normal conditions. The temperature value of the flow-sensitive type harmonic eliminator exceeds the preset maximum temperature value within the preset time period. The total time, and is a preset first weight coefficient; Analyze the temperature information of the impedance transformer to determine whether the impedance transformer is abnormal. Obtain the abnormal temperature characteristic parameters of the impedance transformer through the following formula : ， when hour, ; when hour, ; in, is the average temperature value of the impedance grounding transformer within the preset time period, It is the maximum temperature value of the preset impedance grounding transformer under normal conditions. The temperature value of the impedance grounding transformer exceeds the preset maximum temperature value within the preset time period. The total time, and is a preset second weight coefficient; Analyze the temperature information of the voltage transformer to determine whether the voltage transformer is abnormal. Obtain the abnormal temperature characteristic parameters of the voltage transformer through the following formula : ， when hour, ; when hour, ; in, is the average temperature value of the voltage transformer within the preset time period, is the preset maximum temperature value of the voltage transformer under normal conditions, The temperature value of the voltage transformer exceeds the preset maximum temperature value within the preset time period. The total time, and is a preset third weight coefficient; pass , , Determine whether the temperature of impedance grounding transformers, current-sensitive harmonic eliminators and voltage transformers will cause damage to their own work.

7. The active intervention arc extinguishing and harmonic elimination device according to claim 6, characterized in that: pass , , The specific process of judging whether the temperature of impedance grounding transformer, current-sensitive harmonic eliminator and voltage transformer will cause damage to their own work is as follows: The abnormal temperature characteristic parameters of the flow-sensitive type detuning device 、Abnormal temperature characteristic parameters of impedance transformer , Abnormal temperature characteristic parameters of voltage transformer Respectively with the preset temperature threshold , , Make a comparison judgment: like , and , it is judged that the arc extinguishing and harmonic eliminating device is working normally; like or or , then the components corresponding to the abnormal temperature characteristic parameters greater than the preset temperature threshold will be alarmed and repaired; like , and If the arc extinguishing and harmonic elimination device is in an abnormal working state, an alarm will be issued to notify the staff to carry out maintenance.

8. An active intervention type arc extinguishing and harmonic elimination method, using the active intervention type arc extinguishing and harmonic elimination device according to any one of claims 1 to 7, characterized in that: The method comprises: During the operation of the distribution network system, the intelligent grounding module and the PTC detuning module will monitor the distribution network status in real time through the current transformer 1, the current transformer 2 and the built-in current transformer, and detect the resonance phenomenon caused by the single-phase grounding fault and the non-single-phase grounding fault; When a single-phase grounding fault is detected, the resonance generated by the fault is suppressed through the impedance transformer in the intelligent grounding module; When a non-single-phase grounding fault in the distribution network is detected, causing overvoltage and line resonance, the PTC detuning module is used to actively suppress the resonance; During the operation of the active intervention arc extinguishing and harmonic elimination device, the monitoring module monitors the working status of the PTC harmonic elimination module, the intelligent grounding device and the voltage transformer, and generates status information; The processing module receives the status information and processes the status information. If the processing result shows an abnormality, an alarm signal is generated; Receive alarm signals through the alarm module and take corresponding alarm actions.

9. A computer-readable storage medium storing one or more programs, characterized in that: The one or more programs include instructions that, when executed by a computing device, cause the computing device to perform the method of claim 8 .

10. A computing device based on an active intervention arc extinguishing and harmonic elimination method, characterized in that: include: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs include instructions for executing the method according to claim 8.

Images