CN-122017357-A - Insulation resistance monitoring device, method and storage medium

Abstract

The application relates to the technical field of insulation detection and discloses an insulation resistance monitoring device, an insulation resistance monitoring method and a storage medium, wherein the insulation resistance monitoring device comprises a signal processing module, a control module and an insulation monitoring circuit connected with the signal processing module; the insulation monitoring circuit is used for forming a leakage detection loop with the power line to be monitored and the main grounding electrode, outputting real-time leakage current in the leakage detection loop to the signal processing module, determining real-time voltage corresponding to the real-time leakage current by the signal processing module, outputting the real-time voltage to the control module, determining real-time insulation resistance of the power line to be monitored according to the real-time voltage, and determining whether the insulation state of the power line to be monitored is abnormal according to the real-time insulation resistance and a target insulation resistance threshold value. The application can meet the insulation monitoring requirement of the power line with multiple voltage levels.

Inventors

• ZHANG ZELONG
• LI JIANHONG
• JIANG JUNHAO

Assignees

• 三一锂能有限公司

Dates

Publication Date

20260512

Application Date

20260331

Claims (10)

1. 1. An insulation resistance monitoring device, comprising: The system comprises a signal processing module, a control module and an insulation monitoring circuit connected with the signal processing module, wherein insulation resistance thresholds corresponding to different voltage levels are preset in the control module; The insulation monitoring circuit is used for forming a leakage detection loop with a power line to be monitored and a main grounding electrode, and outputting real-time leakage current in the leakage detection loop to the signal processing module; the signal processing module is used for determining the real-time voltage corresponding to the real-time leakage current and outputting the real-time voltage to the control module; The control module is used for determining the real-time insulation resistance of the power line to be monitored according to the real-time voltage, determining whether the insulation state of the power line to be monitored is abnormal or not according to the real-time insulation resistance and a target insulation resistance threshold value, wherein the target insulation resistance threshold value is an insulation resistance threshold value corresponding to the voltage level of the power line to be monitored.
2. 2. The insulation resistance monitoring device according to claim 1, further comprising an analog leakage monitoring circuit connected to the signal processing module; The control module is also used for determining simulated leakage current according to the target insulation resistance threshold value, generating a first control instruction according to the simulated leakage current, and sending the first control instruction to the simulated leakage monitoring circuit; The analog leakage monitoring circuit is used for generating the analog leakage current according to the first control instruction and outputting the analog leakage current to the signal processing module; The signal processing module is also used for determining the analog voltage corresponding to the analog leakage current; And the control module is also used for determining whether the insulation resistance monitoring device has faults or not according to the analog voltage.
3. 3. The insulation resistance monitoring device according to claim 1, further comprising an execution module connected to the control module; the control module is further used for generating a high-level signal when the insulation state of the power line to be monitored is abnormal, and sending the high-level signal to the execution module; And the execution module is used for disconnecting the power line to be monitored when the high-level signal is received.
4. 4. The insulation resistance monitoring device of claim 3, wherein the execution module comprises: A switching tube, a relay and a circuit breaker; the relay comprises a coil, a first normally open contact and a second normally open contact; The base electrode of the switching tube is connected with the control module, and the collector electrode of the switching tube is respectively connected with the coil of the relay and the first normally open contact; the second normally open contact of the relay is connected in series with the circuit breaker; The switching tube is used for being conducted when receiving a high-level signal of the control module, so that the coil of the relay is electrified, the first normally-open contact and the second normally-open contact are closed, and the circuit breaker is opened, so that the power line to be monitored is opened.
5. 5. The insulation resistance monitoring device of claim 4, wherein the execution module further comprises a reset button; the control module is also used for generating a reset signal when the insulation state of the power line to be monitored is recovered to be normal, and sending the reset signal to the reset button; The reset button is used for being disconnected when receiving a reset signal sent by the control module, so that the coil of the relay is powered off, the first normally-open contact and the second normally-open contact are disconnected, and the circuit breaker is closed, so that the power line to be monitored is conducted.
6. 6. The insulation resistance monitoring device of claim 1, wherein the signal processing module comprises: The sampling resistor, the filtering unit and the signal amplifying unit; the filtering unit is connected with the insulation monitoring circuit and is used for filtering the real-time leakage current and inputting the real-time leakage current after the filtering treatment into the sampling resistor; The sampling resistor is used for converting the received real-time leakage current into corresponding real-time voltage and outputting the real-time voltage to the signal amplifying unit; the signal amplifying unit is used for amplifying the real-time voltage and outputting the amplified real-time voltage to the control module.
7. 7. The insulation resistance monitoring device according to claim 1, wherein the insulation monitoring circuit includes: a first power supply, a three-phase reactor and a first capacitor; the first power supply is used for outputting detection voltage, the positive electrode of the first power supply is connected with the main grounding electrode, and the negative electrode of the first power supply is grounded; the three-phase reactor is respectively connected with the power line to be monitored and the first capacitor, and is connected with a main grounding electrode through the first capacitor; The connection point of the three-phase reactor and the first capacitor is connected with the signal processing module.
8. 8. An insulation resistance monitoring method applied to the insulation resistance monitoring device according to any one of claims 1 to 7, characterized by comprising: Acquiring real-time leakage current in the leakage detection loop; determining a real-time voltage corresponding to the real-time leakage current; determining a real-time insulation resistance of the power line to be monitored according to the real-time voltage; And determining whether the insulation state of the power line to be monitored is abnormal or not according to the real-time insulation resistance and a target insulation resistance threshold, wherein the target insulation resistance threshold is an insulation resistance threshold corresponding to the voltage class of the power line to be monitored.
9. 9. The insulation resistance monitoring method according to claim 8, further comprising: determining an analog leakage current according to the target insulation resistance threshold; Determining an analog voltage corresponding to the analog leakage current; and determining whether the insulation resistance monitoring device has faults according to the analog voltage.
10. 10. A computer readable storage medium having stored thereon computer instructions for causing a computer to perform the method of any one of claims 8 or 9.

Description

Insulation resistance monitoring device, method and storage medium Technical Field The application relates to the technical field of insulation detection, in particular to an insulation resistance monitoring device, an insulation resistance monitoring method and a storage medium. Background When the voltage level of the current power system is 380VAC-1140VAC and is in a continuous lifting trend, even the current power system is expanded to 3300VAC, different voltage levels correspond to different power grid insulation resistance setting values, in the related technology, the three phases of the rectifying pipe power grid are grounded, a leakage detection loop is formed by matching with a load resistor and a current transformer, leakage current is collected, and when the current is lifted to the setting value, the protection device is triggered to act, so that leakage protection is realized. However, the scheme has obvious defects that firstly, for different voltage class systems, load resistors are required to be independently adjusted to match protection setting values, the suitability is poor, the operation is complex, and the expansion requirements of a multi-voltage class power grid cannot be met. Disclosure of Invention In view of this, the present application provides, in a first aspect, an insulation resistance monitoring device including: The system comprises a signal processing module, a control module and an insulation monitoring circuit connected with the signal processing module, wherein insulation resistance thresholds corresponding to different voltage levels are preset in the control module; The insulation monitoring circuit is used for forming a leakage detection loop with a power line to be monitored and a main grounding electrode, and outputting real-time leakage current in the leakage detection loop to the signal processing module; the signal processing module is used for determining the real-time voltage corresponding to the real-time leakage current and outputting the real-time voltage to the control module; The control module is used for determining the real-time insulation resistance of the power line to be monitored according to the real-time voltage, determining whether the insulation state of the power line to be monitored is abnormal or not according to the real-time insulation resistance and a target insulation resistance threshold value, wherein the target insulation resistance threshold value is an insulation resistance threshold value corresponding to the voltage level of the power line to be monitored. According to the embodiment of the application, through constructing a cooperative framework of the insulation monitoring circuit, the signal processing module and the control module, insulation resistance thresholds corresponding to different voltage levels are preset in the control module, the insulation monitoring circuit, the power line to be monitored and the main grounding electrode form a leakage detection loop and output real-time leakage current, the leakage detection loop is converted into real-time voltage through the signal processing module and then transmitted to the control module, the control module calculates real-time insulation resistance according to the real-time voltage, and the insulation state is judged by combining the target insulation resistance thresholds corresponding to the voltage levels of the power line to be monitored. According to the embodiment, the monitoring requirements of the power lines with different voltage levels can be adapted without adjusting hardware by presetting the grading insulation resistance threshold, the problems of poor adaptability and complex operation of the traditional scheme are solved, meanwhile, the real-time insulation resistance value of the power line to be monitored can be accurately acquired through the collection, conversion and insulation resistance calculation of the real-time leakage current, the abnormal accuracy and real-time judgment on whether the insulation state exists or not is realized, and the adaptability and the accuracy of insulation monitoring of the power lines with multiple voltage levels are effectively improved. In an alternative embodiment, the device further comprises an analog leakage monitoring circuit connected with the signal processing module; The control module is also used for determining simulated leakage current according to the target insulation resistance threshold value, generating a first control instruction according to the simulated leakage current, and sending the first control instruction to the simulated leakage monitoring circuit; The analog leakage monitoring circuit is used for generating the analog leakage current according to the first control instruction and outputting the analog leakage current to the signal processing module; The signal processing module is also used for determining the analog voltage corresponding to the analog leakage current; And the control