Insulating property monitoring device
By designing an insulation performance monitoring device including an insulation monitoring module, a communication module and an ACDC power supply module, an online automatic monitoring of the insulation performance of the generator is realized, and the problems of low efficiency, low accuracy and safety risks in the prior art are solved, and monitoring efficiency and safety are improved.
Patent Information
- Application Number
- CN202421117217.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-21
- Publication Date
- 2025-04-29
- Estimated Expiration
- 2034-05-21
AI Technical Summary
In the prior art, the insulation performance monitoring of generators mainly relies on offline measurement methods, which are low in efficiency, low in accuracy and have personnel safety risks, especially in remote areas and offshore generator sets, which are difficult to effectively monitor.
An insulation performance monitoring device including an insulation monitoring module, a communication module and an ACDC power supply module is designed, which can automatically monitor the insulation performance of the generator online, and transmit the detection results to the upper computer through Ethernet to avoid manual operation.
It realizes online automatic monitoring of generator insulation performance, improves detection efficiency and accuracy, reduces personnel safety risks, and provides guarantees for the safe operation of generator sets.
Smart Images
Figure CN222812902U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the field of testing and measuring technology, and in particular, to an insulation performance monitoring device. Background Art
[0002] Large generators are the most important parts of generator sets. Once a failure occurs, it will seriously affect the economic benefits of the unit, and insulation failure is one of the main failures of large generators. Since large generators are subjected to the combined effects of electrical, thermal, mechanical and environmental stresses during operation, the deterioration process of the winding insulation state is directly affected. Insulation degradation will not only reduce the long-term insulation strength of the generator, but also cause generator operation failures and may even cause unexpected accidents such as sudden shutdowns.
[0003] Insulation resistance measurement is a common and simple method used to evaluate the state of electrical insulation for more than 50 years. It can reflect the degree of moisture in the insulation of the generator, conductivity defects and surface leakage parameters. Generator insulation monitoring generally adopts an offline measurement method, where the measurement personnel use a megohmmeter to connect to the generator circuit for measurement. This method is inefficient, has low measurement accuracy and poses personnel safety risks. It is particularly difficult to implement for generators in remote areas and offshore generators.
[0004] Therefore, there is an urgent need for an online insulation performance monitoring device to automatically monitor the insulation performance of the generator and avoid a series of problems caused by manual measurement. Utility Model Content
[0005] The purpose of the present invention is to provide an insulation performance monitoring device, which can realize online automatic monitoring of the insulation performance of the generator, avoid the problems of low efficiency, low measurement accuracy and lack of personnel safety caused by manual operation measurement, and ensure the safe operation of the unit.
[0006] In order to achieve the above-mentioned object, an embodiment of the present disclosure provides an insulation performance monitoring device, the device comprising: an insulation monitoring module, a communication module and an ACDC power supply module;
[0007] The input end of the insulation monitoring module is used to connect to the test input end, the output end of the insulation monitoring module is connected to the input end of the communication module, and the insulation monitoring module is used to detect the insulation performance of the large generator;
[0008] The output end of the communication module is used to connect to Ethernet, and the communication module is used to transmit the detection result of the insulation monitoring module to the host computer through the Ethernet;
[0009] The input end of the ACDC power module is connected to an AC power supply, the output end of the ACDC power module is connected to a power supply end of the communication module, and the ACDC power module is used to convert the AC power supply into a DC power supply to power the communication module.
[0010] Optionally, the communication module includes: a serial-to-Ethernet converter;
[0011] The serial-to-Ethernet converter is used to convert serial communication signals into TCP / IP network interface signals.
[0012] Optionally, the device further comprises a lightning protection module;
[0013] The lightning protection module is connected to the insulation monitoring module and the ACDC power supply module, and the lightning protection module is used to provide lightning protection for the insulation monitoring module and the ACDC power supply module.
[0014] Optionally, the lightning protection module includes an AC power lightning arrester.
[0015] Optionally, the device further includes a power supply protection module;
[0016] The power supply protection module is connected to the lightning protection module, and is used to provide overload, short circuit and undervoltage protection for the device.
[0017] Optionally, the power supply protection module includes an AC air switch.
[0018] Optionally, the device further comprises an indicator light module;
[0019] The indicator light module is connected to the ACDC power supply module and the communication module, and the indicator light module is used to indicate the operating status of the device.
[0020] Optionally, the indicator light module includes a first indicator light and a second indicator light;
[0021] The first indicator light is lit to indicate that the ACDC power supply module is in working state, and the second indicator light is lit to indicate that the insulation monitoring module is in insulation impedance measuring state.
[0022] Optionally, the device further comprises a fuse module, the fuse module comprises a fuse and a fuse mounting seat, the fuse module is connected to the insulation monitoring module, and the fuse module is used to provide overload protection for the insulation monitoring module.
[0023] Optionally, the insurance module is connected to the insulation monitoring module via a high-voltage cable.
[0024] In summary, the embodiment of the present disclosure provides an insulation performance monitoring device, the device comprising: an insulation monitoring module, a communication module and an ACDC power supply module; the input end of the insulation monitoring module is used to connect to the test input end, the output end of the insulation monitoring module is connected to the input end of the communication module, and the insulation monitoring module is used to detect the insulation performance of a large generator; the output end of the communication module is used to connect to Ethernet, and the communication module is used to transmit the detection result of the insulation monitoring module to a host computer through the Ethernet; the input end of the ACDC power supply module is connected to an AC power supply, the output end of the ACDC power supply module is connected to the power supply end of the communication module, and the ACDC power supply module is used to convert the AC power supply into a DC power supply to power the communication module. The embodiment of the present disclosure can realize online automatic monitoring of the insulation performance of the generator, avoid the problems of low efficiency, low measurement accuracy, and lack of personnel safety caused by manual operation measurement, and escort the safe operation of the unit.
[0025] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:
[0027] Figure 1 is a schematic diagram of an insulation performance monitoring device according to an exemplary embodiment.
[0028] Figure 2 is a schematic diagram of an insulation performance monitoring device according to an exemplary embodiment.
[0029] Figure 3 is a schematic diagram of an insulation performance monitoring device according to an exemplary embodiment.
[0030] Figure 4 is a schematic diagram of an insulation performance monitoring device according to an exemplary embodiment.
[0031] Figure 5 is a schematic diagram of an insulation performance monitoring device according to an exemplary embodiment.
[0032] Figure 6 is a top view of an insulation performance monitoring device according to an exemplary embodiment.
[0033] Figure 7 is a side view of an insulation performance monitoring device according to an exemplary embodiment. DETAILED DESCRIPTION
[0034] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.
[0035] It should be understood that the term "including" and its variations used herein are open inclusions, i.e., "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". The relevant definitions of other terms will be given in the following description.
[0036] It should be noted that the concepts of "first", "second", etc. mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units. The modifications of "one" and "multiple" mentioned in the present disclosure are illustrative and not restrictive. Those skilled in the art should understand that unless otherwise clearly indicated in the context, they should be understood as "one or more". In the description of the present disclosure, unless otherwise specified, "multiple" refers to two or more than two, and other quantifiers are similar; "at least one item", "one item or multiple items" or similar expressions refer to any combination of these items, including any combination of single items or plural items.
[0037] Although operations or steps are described in a specific order in the drawings in the embodiments of the present disclosure, it should not be understood that it is required to perform these operations or steps in the specific order shown or in a serial order, or to perform all the operations or steps shown to obtain the desired results. In the embodiments of the present disclosure, these operations or steps can be performed in series; these operations or steps can also be performed in parallel; or some of these operations or steps can be performed.
[0038] The names of the messages or information exchanged between multiple devices in the embodiments of the present disclosure are only for illustrative purposes and are not used to limit the scope of these messages or information. It is understandable that before using the technical solutions disclosed in the embodiments of the present disclosure, the types, scope of use, usage scenarios, etc. of the personal information involved in the present disclosure should be informed to the user in an appropriate manner in accordance with relevant laws and regulations and the user's authorization should be obtained. The present disclosure is described below in conjunction with specific embodiments.
[0039] First, the application scenario of the present disclosure is described. As the most important component of a generator set, a large generator will seriously affect the economic benefits of the unit once a failure occurs, and insulation failure is one of the main failures of a large generator. Since large generators are subjected to the combined effects of electrical, thermal, mechanical and environmental stresses during operation, the deterioration process of the winding insulation state is directly affected. Insulation degradation will not only reduce the long-term insulation strength of the generator, but also cause generator operation failures and may even cause unexpected accidents such as sudden shutdowns.
[0040] Insulation resistance measurement is a common and simple method used to evaluate the state of electrical insulation for more than 50 years. It can reflect the degree of moisture in the insulation of the generator, conductivity defects and surface leakage parameters. Generator insulation monitoring generally adopts an offline measurement method, where the measurement personnel use a megohmmeter to connect to the generator circuit for measurement. This method is inefficient, has low measurement accuracy and poses personnel safety risks. It is particularly difficult to implement for generators in remote areas and offshore generators.
[0041] The existing offline measurement method has the following disadvantages:
[0042] 1. The detection cycle is long, and it takes a long time from job preparation to job completion.
[0043] 2. The detection accuracy and error are greatly affected by the megohmmeter and manual operation.
[0044] 3. The detection requires professional technicians to use a megohmmeter to conduct on-site detection at the generator, which makes it difficult to promote its use on a large scale.
[0045] 4. The detection data needs to be manually recorded and processed, and real-time reporting of the data cannot be achieved, resulting in a lag.
[0046] 5. Manual inspection is costly and poses risks to personal safety.
[0047] In view of this, the embodiments of the present disclosure provide an insulation performance monitoring device, which aims to realize online automatic monitoring of the insulation performance of the generator, avoid the problems of low efficiency, low measurement accuracy and lack of personnel safety caused by manual operation measurement, and ensure the safe operation of the unit.
[0048] Figure 1 FIG. 1 is a schematic diagram of an insulation performance monitoring device according to an exemplary embodiment. Figure 1 As shown, an embodiment of the present disclosure provides an insulation performance monitoring device, which may include: an insulation monitoring module M10, a communication module M20 and an ACDC power supply module M30;
[0049] The input end of the insulation monitoring module M10 is used to connect to the test input end, the output end of the insulation monitoring module M10 is connected to the input end of the communication module M20, and the insulation monitoring module M10 is used to detect the insulation performance of the large generator; the output end of the communication module M20 is used to connect to Ethernet, and the communication module M20 is used to transmit the detection result of the insulation monitoring module M10 to the host computer (not shown in the figure) through Ethernet; the input end of the ACDC power supply module M30 is connected to the AC power supply, the output end of the ACDC power supply module M30 is connected to the power supply end of the communication module M20, and the ACDC power supply module M30 is used to convert the AC power supply into a DC power supply to power the communication module M20.
[0050] Exemplarily, the power supply end can provide AC 220V power supply, the test input end can be connected to the measurement point of the stator winding or rotor winding of the generator, and the test output end can be connected to an Ethernet switch to transmit test data to the host computer to complete the insulation performance monitoring of the generator.
[0051] The insulation monitoring module M10 can be an insulation monitor, which uses the DC injection method to measure the insulation of the generator winding. The insulation monitoring module M10 is interlocked with the generator winding circuit to automatically realize the insulation monitoring module M10 to exit monitoring and separate from the power grid when the generator is running; when the generator is shut down, the insulation monitoring module M10 automatically starts to perform insulation detection between the generator stator winding and the ground, the rotor winding and the ground, and the stator winding and the rotor winding. The power supply voltage of the insulation monitoring module M10 can be 85-265V AC, and the Modbus protocol and RS-485 interface can be used to output measurement communication data. The insulation monitoring module M10 can provide 2 measurement channels to connect to the stator and rotor windings of the generator. The ACDC power supply module M30 can be an AC 220V to DC 24V power supply module.
[0052] In summary, the embodiment of the present disclosure provides an insulation performance monitoring device, the device comprising: an insulation monitoring module, a communication module and an ACDC power supply module; the input end of the insulation monitoring module is used to connect to the test input end, the output end of the insulation monitoring module is connected to the input end of the communication module, and the insulation monitoring module is used to detect the insulation performance of a large generator; the output end of the communication module is used to connect to Ethernet, and the communication module is used to transmit the detection result of the insulation monitoring module to a host computer through the Ethernet; the input end of the ACDC power supply module is connected to an AC power supply, the output end of the ACDC power supply module is connected to the power supply end of the communication module, and the ACDC power supply module is used to convert the AC power supply into a DC power supply to power the communication module. The embodiment of the present disclosure can realize online automatic monitoring of the insulation performance of the generator, avoid the problems of low efficiency, low measurement accuracy, and lack of personnel safety caused by manual operation measurement, and escort the safe operation of the unit.
[0053] In some embodiments, the communication module M20 may include: a serial-to-Ethernet converter (not shown in the figure); the serial-to-Ethernet converter is used to convert a serial communication signal, such as an RS485 signal, into a TCP / IP network interface signal.
[0054] Figure 2 FIG. 1 is a schematic diagram of an insulation performance monitoring device according to an exemplary embodiment. Figure 2 As shown, the device may further include a lightning protection module M40; the lightning protection module M40 is connected to the insulation monitoring module M10 and the ACDC power module M30, and the lightning protection module M40 is used to provide lightning protection for the insulation monitoring module M10 and the ACDC power module M30. This can improve the lightning protection performance of the device.
[0055] In some embodiments, the lightning protection module M40 may include an AC power lightning arrester.
[0056] Figure 3 FIG. 1 is a schematic diagram of an insulation performance monitoring device according to an exemplary embodiment. Figure 3 As shown, the device may further include a power supply protection module M50; the power supply protection module M50 is connected to the lightning protection module M40, and the power supply protection module M50 is used to provide overload, short circuit and voltage loss protection for the device, which can further improve the safety of the device.
[0057] In some embodiments, the power supply protection module M50 may include an AC air switch.
[0058] Figure 4 FIG. 1 is a schematic diagram of an insulation performance monitoring device according to an exemplary embodiment. Figure 4 As shown, the device may further include an indicator light module M60; the indicator light module M60 is connected to the ACDC power supply module M30 and the communication module M20, and the indicator light module M60 is used to indicate the operating status of the device.
[0059] In some embodiments, the indicator light module M60 includes a first indicator light and a second indicator light; the first indicator light is used to indicate that the ACDC power supply module M30 is in a working state, and the second indicator light is used to indicate that the insulation monitoring module M10 is in an insulation impedance measuring state.
[0060] Figure 5 FIG. 1 is a schematic diagram of an insulation performance monitoring device according to an exemplary embodiment. Figure 5As shown, the device may further include a safety module M70, which may include a fuse and a fuse mounting seat (not shown in the figure), and the safety module M70 is connected to the insulation monitoring module M10, and the safety module M70 is used to provide overload protection for the insulation monitoring module M10. This can further improve the safety of the device.
[0061] In some embodiments, the insurance module M70 and the insulation monitoring module M10 may be connected via a high voltage cable, which can further improve the safety of the device.
[0062] In summary, the embodiment of the present disclosure provides an insulation performance monitoring device, the device comprising: an insulation monitoring module, a communication module and an ACDC power supply module; the input end of the insulation monitoring module is used to connect to the test input end, the output end of the insulation monitoring module is connected to the input end of the communication module, and the insulation monitoring module is used to detect the insulation performance of a large generator; the output end of the communication module is used to connect to Ethernet, and the communication module is used to transmit the detection result of the insulation monitoring module to a host computer through the Ethernet; the input end of the ACDC power supply module is connected to an AC power supply, the output end of the ACDC power supply module is connected to the power supply end of the communication module, and the ACDC power supply module is used to convert the AC power supply into a DC power supply to power the communication module. The embodiment of the present disclosure can realize online automatic monitoring of the insulation performance of the generator, avoid the problems of low efficiency, low measurement accuracy, and lack of personnel safety caused by manual operation measurement, and escort the safe operation of the unit.
[0063] Figure 6 FIG. 1 is a top view of an insulation performance monitoring device according to an exemplary embodiment. Figure 6 As shown, the interior of the cabinet M1 includes a cabinet bottom plate M3 and a guide rail M2. For example, the guide rail M2 can be a TS35 standard guide rail, wherein the cabinet bottom plate M3 is fixedly installed with the bottom of the cabinet M1 and the guide rail M2 through the mounting holes, and the guide rail M2 is installed above the cabinet bottom plate M3; the power supply protection module M50, the lightning protection module, the ACDC power supply module, the insulation monitoring module, the communication module and the insurance module are all fixed on the guide rail M2 through snap-fit installation. The preferred material of the cabinet M1 is cold-rolled galvanized steel plate. For example, if the present device is applied to an offshore wind turbine, the material of the cabinet M1 can be selected from 316L stainless steel to meet the requirements of marine salt spray corrosion protection.
[0064] Exemplarily, the power supply protection module M50 disclosed in the present invention can be an AC small standard air switch with 2P poles, trip type C, and rated current 33A; the lightning protection module M40 can be an AC power lightning arrester with an operating voltage of AC 220V; the ACDC power supply module M30 can be an AC 220V to DC 24V power supply module.
[0065] Exemplarily, the insulation monitoring module M10 disclosed in the present invention can be an insulation monitor, which uses a DC injection method to measure the insulation of the generator winding. The test voltage can be DC500V. The insulation monitor is interlocked with the generator winding circuit to automatically realize the insulation monitor to exit monitoring and separate from the power grid when the generator is running. When the generator is shut down, the insulation monitor automatically starts to perform insulation detection on the generator stator winding to the ground, the rotor winding to the ground, and the stator winding to the rotor winding. The insulation monitor power supply voltage can be 85-265V AC, and the Modbus protocol and RS-485 interface can be used to output measurement communication data to the outside. The insulation monitor provides 2 measurement channels to connect to the stator and rotor windings of the generator.
[0066] Exemplarily, the insurance module M70 of the present disclosure is connected to the two measurement channels of the insulation monitor using high-voltage cables inside the cabinet (not shown in the figure). The insurance module M70 also uses high-voltage cables to connect to the stator and rotor winding measurement points of the generator outside the cabinet M1.
[0067] Exemplarily, a hole is opened on one side of the cabinet M1 to install an indicator light module M60, and the indicator light can be red. The indicator light (first indicator light) at the top is always on to indicate that the device is in normal working condition, and the indicator light (second indicator light) at the bottom is always on to indicate that the device is in measuring condition. The ACDC power supply module M30 provides the positive power supply to the indicator light module M60, and the insulation monitor provides the negative power supply to the indicator light module M60 through the internal indicator relay (not shown in the figure). The indicator relay turns on and off the negative power supply according to the working state of the insulation monitor to control the power supply voltage of the indicator light and the on and off of the indicator light to indicate the working state of the device.
[0068] Exemplarily, the grounding post M4 of the present disclosure is a designated grounding point inside the device. The grounding post M4 is a component of the device cabinet M1. Each module inside the device is connected to the grounding post M4 using a ground wire. The grounding post M4 is then connected to a grounding point near the generator through a ground wire, and then connected to the earth, thereby achieving grounding of the entire device.
[0069] Figure 7 FIG. 1 is a side view of an insulation performance monitoring device according to an exemplary embodiment. Figure 7 As shown, the external cable interconnections of this device all pass through the cabinet holes and are interconnected with the modules inside the device.
[0070] Exemplarily, the cabinet 1# hole of the present disclosure is used for AC power access. One end of the power cable takes power from the AC power source, passes through the cabinet 1# hole, and the other end is connected to the power supply protection module M50 inside the device.
[0071] Exemplarily, the cabinet 3# hole of the present disclosure is used for network access. One end of the network cable is connected to the network port of the ring network switch, passes through the cabinet 3# hole, and then the other end is connected to the network port of the communication module M20 inside the device.
[0072] Exemplarily, the cabinet 4# hole of the present disclosure is used for generator control signal access. One end of the signal line is connected to the generator loop interlock control circuit breaker, receives the shutdown and / or working status signal of the generator, passes through the cabinet 4# hole, and the other end is connected to the insulation monitoring module M10 inside the device.
[0073] For example, the cabinet hole 7# of the present disclosure is used to connect the generator winding for insulation resistance monitoring. One end of the high-voltage cable is connected to the stator winding, passes through the cabinet hole 7#, and the other end is connected to the insurance module M70 inside the device.
[0074] For example, the cabinet 8# hole of the present disclosure is used to connect the generator winding for insulation resistance monitoring. One end of the high-voltage cable is connected to the rotor winding, passes through the cabinet 8# hole, and the other end is connected to the insurance module M70 inside the device.
[0075] Exemplarily, the cabinet hole 9# of the present disclosure is used for grounding the device. One end of the grounding cable is connected to the grounding point of the generator accessory, and then connected to the ground. The grounding cable passes through the cabinet hole 9#, and the other end is connected to the grounding column M4 inside the device.
[0076] Exemplarily, the cabinet 2# hole, cabinet 5# hole and cabinet 6# hole of the present disclosure are spare openings, which are plugged with plugs when not in use.
[0077] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.
[0078] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.
[0079] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.
Claims
1. An insulation performance monitoring device, characterized in that: The device comprises: an insulation monitoring module, a communication module and an ACDC power supply module; The input end of the insulation monitoring module is used to connect to the test input end, the output end of the insulation monitoring module is connected to the input end of the communication module, and the insulation monitoring module is used to detect the insulation performance of the large generator; The output end of the communication module is used to connect to Ethernet, and the communication module is used to transmit the detection result of the insulation monitoring module to the host computer through the Ethernet; The input end of the ACDC power module is connected to an AC power supply, the output end of the ACDC power module is connected to a power supply end of the communication module, and the ACDC power module is used to convert the AC power supply into a DC power supply to power the communication module.
2. The insulation performance monitoring device according to claim 1, characterized in that: The communication module includes: a serial-to-Ethernet converter; The serial-to-Ethernet converter is used to convert serial communication signals into TCP / IP network interface signals.
3. The insulation performance monitoring device according to claim 1, characterized in that: The device also includes a lightning protection module; The lightning protection module is connected to the insulation monitoring module and the ACDC power supply module, and the lightning protection module is used to provide lightning protection for the insulation monitoring module and the ACDC power supply module.
4. The insulation performance monitoring device according to claim 3, characterized in that: The lightning protection module includes an AC power lightning arrester.
5. The insulation performance monitoring device according to claim 3, characterized in that: The device also includes a power supply protection module; The power supply protection module is connected to the lightning protection module, and is used to provide overload, short circuit and undervoltage protection for the device.
6. The insulation performance monitoring device according to claim 5, characterized in that: The power supply protection module includes an AC air switch.
7. The insulation performance monitoring device according to claim 1, characterized in that: The device also includes an indicator light module; The indicator light module is connected to the ACDC power supply module and the communication module, and the indicator light module is used to indicate the operating status of the device.
8. The insulation performance monitoring device according to claim 7, characterized in that: The indicator light module includes a first indicator light and a second indicator light; The first indicator light is lit to indicate that the ACDC power supply module is in working state, and the second indicator light is lit to indicate that the insulation monitoring module is in insulation impedance measuring state.
9. The insulation performance monitoring device according to claim 1, characterized in that: The device further comprises a fuse module, which comprises a fuse and a fuse mounting seat. The fuse module is connected to the insulation monitoring module and is used to provide overload protection for the insulation monitoring module.
10. The insulation performance monitoring device according to claim 9, characterized in that: The insurance module is connected to the insulation monitoring module via a high-voltage cable.