Device for monitoring neutral point grounding resistor cabinet and resistor cabinet

Abstract

The utility model relates to the technical field of resistor cabinets, and discloses a device for monitoring a neutral point grounding resistor cabinet and the resistor cabinet, the device is applied to the resistor cabinet and independently arranged outside the resistor cabinet, and the device comprises a neutral point resistor, a temperature sensor, a current transformer, a voltage sensor and a temperature sensor monitoring module; the neutral point resistor is electrically connected with the neutral point, and the temperature sensor is arranged at the neutral point resistor; the voltage sensor is connected with the neutral point, and the voltage sensor is electrically connected with the resistor cabinet; the current transformer is arranged at the cable where the neutral point and the neutral point resistor are connected, the current transformer is connected with the resistor cabinet, the current transformer obtains the current value of the current flowing out of the neutral point through the self-inductance effect of an inductor, and the current transformer is electrically connected with the resistor cabinet; the temperature sensor monitoring module is electrically connected with the temperature sensor, and the temperature sensor monitoring module is used for carrying out abnormity reminding when the temperature sensor is in a fault state.

Description

Technical Field

[0001] The utility model relates to the technical field of resistor cabinets, in particular to a device for monitoring a neutral point grounding resistor cabinet and a resistor cabinet. Background Art

[0002] In the related art, the detection of the neutral point grounding resistance requires disconnecting the neutral point grounding resistance from the power grid and shutting down the power supply, which has an adverse effect on the related construction process. Summary of the invention

[0003] In view of this, the utility model provides a device and a resistance cabinet for monitoring a neutral point grounding resistance cabinet to solve the problem in the related technology that the detection of the neutral point grounding resistance requires disconnecting the connection between the neutral point grounding resistance and the power grid, which has an adverse effect on the related construction process.

[0004] In the first aspect, the utility model provides a device for monitoring a neutral point grounding resistor cabinet, which is applied to the resistor cabinet and independently set up outside the resistor cabinet. The device includes: a neutral point resistor, a temperature sensor, a current transformer, a voltage sensor and a temperature sensor monitoring module; the neutral point resistor is electrically connected to the neutral point, the temperature sensor is arranged at the neutral point resistor, the temperature sensor is used to obtain the temperature value of the neutral point resistor, the first current flowing out from the neutral point flows from the neutral point through the neutral point resistor to the first grounding position, and the temperature sensor is electrically connected to the resistor cabinet; the voltage sensor is electrically connected to the neutral point point connection, the second current flowing out from the neutral point flows from the neutral point through the voltage sensor, and flows to the second grounding position, and the voltage sensor is electrically connected to the resistor cabinet; a current transformer is arranged at the cable connecting the neutral point and the neutral point resistor, and the current transformer is connected to the resistor cabinet, and the current transformer uses the self-inductance of the inductor to obtain the current value of the current flowing out from the neutral point, and the current transformer is electrically connected to the resistor cabinet; the temperature sensor monitoring module is electrically connected to the temperature sensor, and the temperature sensor monitoring module is used to provide an abnormal reminder when the temperature sensor fails.

[0005] In this way, by utilizing redundant and associated current transformers, voltage sensors, and temperature sensors and monitoring the status of the temperature sensor through a temperature sensor monitoring model, deviations in monitoring results due to temperature sensor failures can be avoided. There is no need to disconnect the neutral point grounding resistor cabinet from the power grid, and no power outage is required. In addition, the status of the temperature sensor can be monitored in real time to avoid misjudgment caused by damage to the temperature sensor, and neutral point grounding resistor failures can be discovered in time to avoid electrical fires.

[0006] In an optional implementation, the aforementioned device further includes: a bidirectional breakdown diode electrically connected to the voltage sensor, wherein the bidirectional breakdown diode is disposed between the voltage sensor and the second grounding position.

[0007] The surge voltage is shunted and clamped to protect the components in the circuit from being damaged by the instantaneous surge pulse voltage.

[0008] In an optional implementation, the aforementioned device further includes: a current transformer monitoring module electrically connected to the current transformer, and the current transformer monitoring module is used to issue an abnormal reminder when the current transformer fails.

[0009] In this way, by monitoring the status of the current transformer through the current transformer monitoring module, the deviation of the monitoring result caused by the current transformer failure can be avoided; in addition, the status of the current transformer can be monitored in real time to avoid misjudgment caused by damage to the current transformer, and the neutral point grounding resistance failure can be discovered in time to avoid the occurrence of electrical fires.

[0010] In an optional implementation, the aforementioned device further includes: a voltage sensor monitoring module electrically connected to the voltage sensor, and the voltage sensor monitoring module is used to issue an abnormal reminder when the voltage sensor fails.

[0011] By monitoring the status of the voltage sensor through the voltage sensor monitoring module, the deviation of the monitoring result caused by the failure of the voltage sensor can be avoided. In addition, the status of the voltage sensor can be monitored in real time to avoid misjudgment caused by damage to the voltage sensor, and the neutral point grounding resistance failure can be discovered in time to avoid the occurrence of electrical fires.

[0012] In an optional embodiment, the aforementioned device also includes: a neutral point resistor circuit break monitoring module, which is electrically connected to the neutral point resistor, and the neutral point resistor circuit break monitoring module is used to provide a neutral point resistor circuit break abnormality reminder when the neutral point resistor is in a circuit break state.

[0013] By judging whether the neutral point resistor is disconnected through the neutral point disconnection monitoring module, the neutral point grounding resistor disconnection fault can be discovered in time to avoid the occurrence of electrical fires.

[0014] In an optional embodiment, the aforementioned device also includes: a neutral point resistance low value monitoring module, which is electrically connected to the neutral point resistance, and the neutral point resistance low value monitoring module is used to provide a neutral point resistance low value abnormality reminder when the neutral point resistance is lower than the resistance low value coefficient.

[0015] It can monitor the neutral point resistance in real time, accurately identify the type of neutral point resistance fault, and ensure the normal operation of the power system.

[0016] In an optional embodiment, the aforementioned device also includes: a neutral point resistance high value monitoring module, which is electrically connected to the neutral point resistance, and the neutral point resistance high value monitoring module is used to issue a neutral point resistance high value abnormality reminder when the neutral point resistance is higher than the resistance high value coefficient.

[0017] It can monitor the neutral point resistance in real time, accurately identify the type of neutral point resistance fault, and ensure the normal operation of the power system.

[0018] In the second aspect, the utility model provides a resistor cabinet, which includes: a resistor cabinet body; the aforementioned device for monitoring the neutral point grounding resistor cabinet, which is independently established outside the resistor cabinet body, wherein a temperature sensor is electrically connected to the resistor cabinet body; a current transformer is electrically connected to the resistor cabinet body; and a voltage sensor is electrically connected to the resistor cabinet body.

[0019] In this way, by utilizing redundant and associated current transformers, voltage sensors and temperature sensors, as well as a current transformer monitoring module corresponding to the current transformer, a voltage sensor monitoring module corresponding to the voltage sensor, and a temperature sensor monitoring module corresponding to the temperature sensor, it is possible to avoid monitoring result deviations caused by individual sensor failures and achieve real-time monitoring; through the neutral point resistance open circuit monitoring module, the neutral point resistance low value monitoring module and the neutral point resistance high value monitoring module, the neutral point grounding resistance failure can be discovered in time, and the fault type of the neutral point grounding resistance can be identified to avoid electrical fires. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic structural diagram of a device for monitoring a neutral point grounding resistance cabinet provided in this embodiment is shown. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0023] The monitoring of the neutral point grounding resistor cabinet in the related technology requires disconnecting the neutral point grounding resistor cabinet from the power grid, and connecting the test pen of the multimeter to the two terminals of the neutral point grounding resistor cabinet respectively; before measuring, the grounding switch inside the neutral point grounding resistor cabinet needs to be turned off to prevent multiple groundings between the grounding conductor inside the grounding resistor cabinet and the ground; turn on the resistance range of the multimeter, and adjust the range to the appropriate range according to the selected multimeter; record the measurement results. If the result is too large, the length of the grounding conductor can be appropriately shortened or replaced; if the result is too small, the length of the grounding conductor can be appropriately increased. In this process, it should be noted that before measuring, it is necessary to ensure that the connection between the neutral point grounding resistor cabinet and the power grid has been cut off. At the same time, safety should be paid attention to during the measurement process to avoid dangers such as electric shock.

[0024] In the related art, the monitoring of the neutral point grounding resistor cabinet requires disconnecting the neutral point grounding resistor cabinet from the power grid, which requires a power outage and has an adverse effect on the related construction process. Secondly, the neutral point grounding resistor cabinet cannot be monitored in real time, and there is a risk that the grounding resistor cabinet will burn out, and the system connected to the resistor cabinet will become an ungrounded system, posing a fire safety hazard.

[0025] This embodiment provides a device for monitoring a neutral point grounding resistor cabinet. Figure 1 FIG. 4 shows a schematic diagram of a structure of a device for monitoring a neutral point grounding resistance cabinet provided in this embodiment, such as Figure 1As shown, the device for monitoring the neutral point grounding resistor cabinet is applied to the resistor cabinet and is independently set up outside the resistor cabinet, including: a neutral point resistor 11, a temperature sensor 12, a current transformer 13, a voltage sensor 14 and a temperature sensor monitoring module; the neutral point resistor 11 is electrically connected to the neutral point 16, the temperature sensor 12 is arranged at the neutral point resistor 11, the temperature sensor 12 is used to obtain the temperature value of the neutral point resistor 11, the first current flowing out of the neutral point 16 flows from the neutral point 16 through the neutral point resistor 11 to the first grounding position, and the temperature sensor 12 is electrically connected to the resistor cabinet; the voltage sensor 14 is electrically connected to the neutral point 16 is connected, the second current flowing out from the neutral point 16 flows from the neutral point 16 through the voltage sensor 14, and flows to the second grounding position. The voltage sensor 14 is electrically connected to the resistor cabinet; the current transformer 13 is arranged at the cable connecting the neutral point 16 and the neutral point resistor 11, the current transformer 13 is connected to the resistor cabinet, the current transformer 13 uses the self-inductance of the inductor to obtain the current value of the current flowing out from the neutral point 16, and the current transformer 13 is electrically connected to the resistor cabinet; the temperature sensor monitoring module is electrically connected to the temperature sensor 12, and the temperature sensor monitoring module is used to provide an abnormal reminder when the temperature sensor 12 fails.

[0026] In this embodiment, the neutral point is a common point in the three-phase power supply or three-phase load in a star-connected state. When the neutral point of the three-phase star-connected load is connected to the neutral point of the power supply by a wire or a neutral line, the potentials of the two neutral points are basically the same, the voltages of the three-phase loads are symmetrical, and the loads of each phase operate normally. If the neutral line is disconnected, the voltage of the three-phase load will be asymmetrical, with some phases rising and some phases falling, affecting the normal operation of each load.

[0027] The neutral point current transformer is an electrical component used to measure current in power systems. Its main function is to reduce the voltage of the high-voltage side current signal and provide it to low-voltage equipment for use, while protecting the integrity and safety of the high-voltage side circuit. The basic principle is to use the self-inductance of the inductor so that the high-voltage side current signal can be reduced in voltage and transmitted to the low-voltage side equipment through the neutral point current transformer for measurement.

[0028] The temperature sensor monitoring module is electrically connected to the current transformer; the temperature sensor monitoring module is electrically connected to the voltage sensor; the temperature sensor monitoring module includes: a signal acquisition and processing circuit. The signal acquisition and processing circuit obtains the current value of the current transformer, the voltage value of the voltage sensor, and the temperature value of the temperature sensor; the signal acquisition and processing circuit compares the obtained voltage value with the preset voltage threshold; the signal acquisition and processing circuit obtains the change of the temperature value within the preset time interval; when the signal acquisition and processing circuit compares that the obtained voltage value is greater than the preset voltage threshold, and the current value is normal, and the temperature value does not rise within the preset time interval, the temperature sensor fails, and the temperature sensor monitoring module issues a temperature sensor abnormality reminder.

[0029] In this way, by utilizing redundant and associated current transformers, voltage sensors, and temperature sensors and monitoring the status of the temperature sensor through a temperature sensor monitoring model, deviations in monitoring results due to temperature sensor failures can be avoided. There is no need to disconnect the neutral point grounding resistor cabinet from the power grid, and no power outage is required. In addition, the status of the temperature sensor can be monitored in real time to avoid misjudgment caused by damage to the temperature sensor, and neutral point grounding resistor failures can be discovered in time to avoid electrical fires.

[0030] In some embodiments, the aforementioned device for monitoring a neutral point grounding resistor cabinet further includes: a bidirectional breakdown diode 17 electrically connected to the voltage sensor 14, and the bidirectional breakdown diode 14 is arranged between the voltage sensor 14 and the second grounding position.

[0031] In this embodiment, the bidirectional breakdown diode is used to suppress instantaneous overvoltage. When a surge pulse voltage appears instantaneously in the circuit where the bidirectional breakdown diode is located, the bidirectional breakdown diode can quickly undergo Zener breakdown, changing from a high-resistance state to a low-resistance state, thereby shunting and clamping the surge voltage, thereby protecting the components in the circuit from being damaged by the instantaneous surge pulse voltage.

[0032] In some embodiments, the aforementioned device for monitoring a neutral point grounding resistor cabinet further includes: a current transformer monitoring module electrically connected to the current transformer, and the current transformer monitoring module is used to provide an abnormal reminder when the current transformer fails.

[0033] In this embodiment, the current transformer monitoring module is electrically connected to the voltage sensor, and the current transformer monitoring module is electrically connected to the temperature sensor. The current transformer monitoring module includes: a signal acquisition and processing circuit. The signal acquisition and processing circuit obtains the voltage value of the voltage sensor, the temperature value of the temperature sensor, and the current value of the current transformer; the signal acquisition and processing circuit compares the obtained voltage value with the preset voltage threshold; the signal acquisition and processing circuit obtains the change of the temperature value within the preset time interval; when the signal acquisition and processing circuit compares that the voltage value is greater than the preset voltage threshold, and the temperature value rises within the preset time interval, and the current value is not obtained, the current transformer is faulty, and the current transformer monitoring module issues a current transformer abnormality reminder.

[0034] In this way, by monitoring the status of the current transformer through the current transformer monitoring module, the deviation of the monitoring result caused by the current transformer failure can be avoided; in addition, the status of the current transformer can be monitored in real time to avoid misjudgment caused by damage to the current transformer, and the neutral point grounding resistance failure can be discovered in time to avoid the occurrence of electrical fires.

[0035] In some embodiments, the aforementioned device for monitoring a neutral point grounding resistor cabinet further includes: a voltage sensor monitoring module electrically connected to the voltage sensor, and the voltage sensor monitoring module is used to provide an abnormal reminder when the voltage sensor fails.

[0036] In this embodiment, the voltage sensor monitoring module is electrically connected to the current transformer; the voltage sensor monitoring module is electrically connected to the current sensor; the voltage sensor monitoring module includes: a signal acquisition and processing circuit. The signal acquisition and processing circuit obtains the current value of the current transformer, the temperature value of the temperature sensor, and the voltage value of the voltage sensor; the signal acquisition and processing circuit compares the obtained current value with the preset current threshold; the signal acquisition and processing circuit obtains the change of the temperature value within the preset time interval; when the signal acquisition and processing circuit compares that the current value is greater than the preset current threshold, and the temperature value rises within the preset time interval, and the voltage value is not obtained, the voltage sensor fails, and the voltage sensor monitoring module issues a voltage sensor abnormality reminder.

[0037] By monitoring the status of the voltage sensor through the voltage sensor monitoring module, the deviation of the monitoring result caused by the failure of the voltage sensor can be avoided. In addition, the status of the voltage sensor can be monitored in real time to avoid misjudgment caused by damage to the voltage sensor, and the neutral point grounding resistance failure can be discovered in time to avoid the occurrence of electrical fires.

[0038] In some embodiments, the aforementioned device for monitoring the neutral point grounding resistor cabinet also includes: a neutral point resistor circuit break monitoring module, which is electrically connected to the neutral point resistor, and the neutral point resistor circuit break monitoring module is used to provide a neutral point resistor circuit break abnormality reminder when the neutral point resistor is in a circuit break state.

[0039] In this embodiment, the neutral point resistor circuit break monitoring module is electrically connected to the voltage sensor, the neutral point resistor circuit break monitoring module is electrically connected to the current transformer, and the neutral point resistor circuit break monitoring module is electrically connected to the temperature sensor; the neutral point resistor circuit break monitoring module includes: a signal acquisition and processing circuit. The signal acquisition and processing circuit obtains the current value of the current transformer, the temperature value of the temperature sensor, and the voltage value of the voltage sensor; the signal acquisition and processing circuit compares the obtained voltage value with the preset voltage threshold; the signal acquisition and processing circuit compares the obtained current value with the preset current threshold; the signal acquisition and processing circuit compares the obtained temperature value with the preset temperature threshold; when the signal acquisition and processing circuit compares that the voltage value is greater than the preset voltage threshold, and the current value is less than the preset current threshold, and the temperature value is less than the preset temperature threshold, the neutral point resistor is broken, and the neutral point resistor circuit break monitoring module issues a neutral point resistor circuit break abnormality reminder.

[0040] By judging whether the neutral point resistor is disconnected through the neutral point disconnection monitoring module, the neutral point grounding resistor disconnection fault can be discovered in time to avoid the occurrence of electrical fires.

[0041] In some embodiments, the aforementioned device for monitoring the neutral point grounding resistor cabinet also includes: a neutral point resistance low value monitoring module, which is electrically connected to the neutral point resistor. The neutral point resistance low value monitoring module is used to provide a neutral point resistance low value abnormality reminder when the neutral point resistance is lower than the resistance low value coefficient.

[0042] In this embodiment, the neutral point resistance low value monitoring module is electrically connected to the voltage sensor, the neutral point resistance low value monitoring module is electrically connected to the temperature sensor, the neutral point resistance low value monitoring module is electrically connected to the current transformer, and the neutral point resistance low value monitoring module includes: a signal acquisition and processing circuit. The signal acquisition and processing circuit obtains the voltage value of the voltage sensor, the temperature value of the temperature sensor, and the current value of the current transformer; the signal acquisition and processing circuit compares the obtained voltage value with the preset voltage threshold, and the signal acquisition and processing circuit compares the obtained current value with the preset current threshold. The signal acquisition and processing circuit obtains the current resistance value based on the voltage value and the current value, and obtains the resistance coefficient based on the current resistance value and the resistance standard value; when the signal acquisition and processing circuit compares that the voltage value is greater than the preset voltage threshold, and the current value is greater than the preset current threshold, and the temperature value is greater than the preset temperature threshold, and the resistance coefficient is less than the resistance low value coefficient, the neutral point resistance low value monitoring module issues a neutral point resistance abnormal fault alarm. The neutral point resistance can be monitored in real time, the neutral point resistance fault type can be accurately identified, and the normal operation of the power system can be ensured.

[0043] In some embodiments, the aforementioned device for monitoring the neutral point grounding resistor cabinet also includes: a neutral point resistance high value monitoring module, which is electrically connected to the neutral point resistor, and the neutral point resistance high value monitoring module is used to provide a neutral point resistance high value abnormality reminder when the neutral point resistance is higher than the resistance high value coefficient.

[0044] In this embodiment, the neutral point resistance high value monitoring module is electrically connected to the voltage sensor, the neutral point resistance high value monitoring module is electrically connected to the temperature sensor, the neutral point high value and low value monitoring module is electrically connected to the current transformer, and the neutral point resistance high value monitoring module includes: a signal acquisition and processing circuit. The signal acquisition and processing circuit obtains the voltage value of the voltage sensor, the temperature value of the temperature sensor, and the current value of the current transformer; the signal acquisition and processing circuit compares the obtained voltage value with the preset voltage threshold, and the signal acquisition and processing circuit compares the obtained current value with the preset current threshold. The signal acquisition and processing circuit obtains the current resistance value based on the voltage value and the current value, and obtains the resistance coefficient based on the current resistance value and the resistance standard value; when the signal acquisition and processing circuit compares that the voltage value is greater than the preset voltage threshold, and the current value is greater than the preset current threshold, and the temperature value is greater than the preset temperature threshold, and the resistance coefficient is greater than the resistance high value coefficient, the neutral point resistance high value monitoring module issues a neutral point resistance abnormal fault alarm. The neutral point resistance can be monitored in real time, the neutral point resistance fault type can be accurately identified, and the normal operation of the power system can be ensured.

[0045] The present embodiment also provides a resistor cabinet 18, comprising: a resistor cabinet body; the aforementioned device for monitoring the neutral point grounding resistor cabinet, the device for monitoring the neutral point grounding resistor cabinet is independently set up outside the resistor cabinet body, wherein the temperature sensor 12 is electrically connected to the resistor cabinet body; the current transformer 13 is electrically connected to the resistor cabinet body; and the voltage sensor 14 is electrically connected to the resistor cabinet body.

[0046] In this way, by utilizing redundant and associated current transformers, voltage sensors and temperature sensors, as well as a current transformer monitoring module corresponding to the current transformer, a voltage sensor monitoring module corresponding to the voltage sensor, and a temperature sensor monitoring module corresponding to the temperature sensor, it is possible to avoid monitoring result deviations caused by individual sensor failures and achieve real-time monitoring; through the neutral point resistance open circuit monitoring module, the neutral point resistance low value monitoring module and the neutral point resistance high value monitoring module, the neutral point grounding resistance failure can be discovered in time, and the fault type of the neutral point grounding resistance can be identified to avoid electrical fires.

[0047] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A device for monitoring a neutral point grounding resistor cabinet, characterized in that: Applied to a resistor cabinet and independently set up outside the resistor cabinet, the device includes: Neutral point resistor, temperature sensor, current transformer, voltage sensor and temperature sensor monitoring module; The neutral point resistor is electrically connected to the neutral point, the temperature sensor is arranged at the neutral point resistor, the temperature sensor is used to obtain the temperature value of the neutral point resistor, the first current flowing out of the neutral point flows from the neutral point through the neutral point resistor to the first grounding position, and the temperature sensor is electrically connected to the resistor cabinet; The voltage sensor is connected to the neutral point, a second current flowing out from the neutral point flows from the neutral point through the voltage sensor to the second grounding position, and the voltage sensor is electrically connected to the resistor cabinet; A current transformer is arranged at the cable connecting the neutral point and the neutral point resistor, the current transformer is connected to the resistor cabinet, the current transformer uses the self-inductance of the inductor to obtain the current value of the current flowing out of the neutral point, and the current transformer is electrically connected to the resistor cabinet; The temperature sensor monitoring module is electrically connected to the temperature sensor, and is used to provide an abnormal reminder when the temperature sensor fails.

2. The device according to claim 1, characterized in that Also includes: The bidirectional breakdown diode is electrically connected to the voltage sensor, and the bidirectional breakdown diode is arranged between the voltage sensor and the second grounding position.

3. The device according to claim 1 or 2, characterized in that: Also includes: A current transformer monitoring module is electrically connected to the current transformer, and is used to provide an abnormal reminder when the current transformer fails.

4. The device according to claim 3, characterized in that Also includes: A voltage sensor monitoring module is electrically connected to the voltage sensor, and the voltage sensor monitoring module is used to provide an abnormal reminder when the voltage sensor fails.

5. The device according to claim 3, characterized in that Also includes: The neutral point resistor circuit break monitoring module is electrically connected to the neutral point resistor, and the neutral point resistor circuit break monitoring module is used to provide a neutral point resistor circuit break abnormality reminder when the neutral point resistor is in a circuit break state.

6. The device according to claim 3, characterized in that Also includes: The neutral point resistance low value monitoring module is electrically connected to the neutral point resistance. The neutral point resistance low value monitoring module is used to provide a neutral point resistance low value abnormality reminder when the neutral point resistance is lower than the resistance low value coefficient.

7. The device according to claim 3, characterized in that Also includes: The neutral point resistance high value monitoring module is electrically connected to the neutral point resistance. The neutral point resistance high value monitoring module is used to provide a neutral point resistance high value abnormality reminder when the neutral point resistance is higher than the resistance high value coefficient.

8. A resistor cabinet, characterized in that: The resistance cabinet comprises: Resistance cabinet body; The device for monitoring a neutral point grounding resistor cabinet as described in any one of claims 1 to 7 is independently established outside the resistor cabinet body, wherein a temperature sensor is electrically connected to the resistor cabinet body; a current transformer is electrically connected to the resistor cabinet body; and a voltage sensor is electrically connected to the resistor cabinet body.

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