Method and device based on neutral point grounding resistance device

Abstract

The invention discloses a control method and device based on a neutral point grounding resistance device, and the method is applied to a power supply side, and comprises the steps: obtaining a grounding current signal and a state signal of the power supply side; based on the grounding current signal and the state signal, it is determined that first target equipment is grounded, and the power supply side comprises multiple pieces of equipment capable of being grounded. According to the invention, through automatic switching of the grounding devices, it is ensured that only one grounding device in the power supply side is in a grounding state under any condition, the problem of current shunting caused by grounding of multiple positions can be effectively avoided, the sensitivity and accuracy of the grounding protection device are ensured, and thus the grounding safety of the whole system is improved.

Description

Technical Field

[0001] This application relates to the field of grounding system technology, and in particular to a method and apparatus based on a neutral point grounding resistance device. Background Technology

[0002] In recent years, many domestic and international cement companies, in order to achieve energy conservation and environmental protection goals, maximize their long-term electricity needs, reduce external electricity purchases, lower cement production costs, and improve economic efficiency, have been utilizing waste heat from cement kiln precalciner systems for power generation and expanding their self-consumed waste heat power plants. Typically, waste heat power plants operate connected to the external power grid. However, in areas with poor power supply reliability, waste heat power plants need to operate offline, independently powering a portion of the cement production line's load. This shift from grid-connected to offline operation leads to changes in the neutral grounding method on the cement company's power supply side.

[0003] On the power supply side, there should only be one grounding point in the same location. If there are multiple grounding points, the grounding current will be diverted when a single-phase ground fault occurs, resulting in a decrease in the sensitivity of the grounding protection, which is unacceptable.

[0004] After a cement plant expands its self-contained power station or waste heat power station, the load side will include multiple generators for self-consumption. If the neutral point is not grounded by a resistor, and the step-down transformer fails or is disconnected from the grid for other reasons, the self-contained power station will operate in islanded mode. In this case, the power supply side will lose its grounding point and become an ungrounded system, requiring significant adjustments to the settings of the original ground fault relay protection device. Therefore, the neutral point of the system should be equipped with a resistor grounding, and the grounding device should have an automatic switching function.

[0005] To address the issue of multiple neutral point grounding devices, a new technical solution is needed. Summary of the Invention

[0006] The purpose of this application is to provide a method based on a neutral point grounding resistor device, the method comprising:

[0007] Acquire the grounding current signal and status signal of the power supply side;

[0008] Based on the grounding current signal and the status signal, the grounding of the first target device is determined, wherein the power supply side includes multiple devices that can be grounded.

[0009] As an optional embodiment, obtaining the status signal of the power supply side includes the following:

[0010] Obtain the position status signals of each grounding device in the power supply side;

[0011] Obtain the position status signal of the neutral point grounding isolation of the step-down transformer on the power supply side;

[0012] Obtain the position status signal of the grounding isolation of each neutral point in the power supply side;

[0013] Obtain the status signal of the incoming switch of the step-down transformer on the power supply side;

[0014] Obtain the status signal of the generator circuit breaker on the power supply side.

[0015] As an optional embodiment, the method further includes:

[0016] If the grounding current signal is determined to be abnormal, disconnect the grounding of the first target device;

[0017] The grounding of the second target device is re-determined among the plurality of groundable devices.

[0018] As an optional embodiment, the method further includes:

[0019] A backup device is identified from the plurality of groundable devices;

[0020] If the first target device is found to be abnormal, the backup device is switched to ground, wherein only one device is in the grounding state at any given time.

[0021] As an optional embodiment, the power supply side includes a step-down transformer, a generator, and a control cabinet, and the method further includes:

[0022] If the status signal of the step-down transformer is determined to be normal, the neutral point of the step-down transformer is grounded, and the neutral point of the generator is simultaneously disconnected from the ground.

[0023] If the status signal of the step-down transformer is found to be abnormal, the neutral point of any operating generator is determined to be grounded.

[0024] As an optional embodiment, determining that the ground current signal is abnormal includes:

[0025] The acquired ground current signal is compared with the preset target ground current signal;

[0026] Based on the comparison results, the state of the grounding current signal is determined.

[0027] As an optional embodiment, the method further includes:

[0028] If the target device is found to be malfunctioning and its grounding has not been disconnected, an alarm signal is issued.

[0029] As an optional embodiment, the method further includes:

[0030] Record the operating data of the power supply side, including grounding current, grounding status, and operating history;

[0031] Analyze the operational data to optimize the operation and maintenance strategy of the neutral point grounding resistor device.

[0032] The purpose of this application is to provide a neutral point grounding resistor device, applied on the power supply side, including:

[0033] The acquisition module is configured to acquire the grounding current signal and status signal of the power supply side;

[0034] The determination module is configured to determine the grounding of a first target device based on the grounding current signal and the status signal, wherein the power supply side includes multiple devices that can be grounded.

[0035] The purpose of this application is to provide a neutral point grounding resistor device, including a busbar connected to a high-voltage disconnector, the high-voltage disconnector connected to a high-voltage contactor, a grounding resistor connected to a current transformer and a PLC control cabinet, and the high-voltage contactor and the current transformer connected to the PLC control cabinet respectively.

[0036] The beneficial effects of the embodiments of this application are as follows:

[0037] This application ensures that only one grounding device on the power supply side is in a grounded state under any circumstances by automatically switching grounding devices. This can effectively avoid the current diversion problem caused by multiple groundings, ensure the sensitivity and accuracy of the grounding protection device, and thus improve the overall grounding safety of the system.

[0038] Because the automatic switching grounding device can maintain grounding under different conditions, the settings of the original ground fault relay protection device do not need to be adjusted frequently, thereby simplifying the equipment maintenance and management process, reducing manual intervention, and improving system operating efficiency. Attached Figure Description

[0039] Figure 1 This is a flowchart of a method according to an embodiment of this application;

[0040] Figure 2 This is a flowchart of method S3 in an embodiment of this application;

[0041] Figure 3 This is a flowchart of method S4 in an embodiment of this application;

[0042] Figure 4 This is a flowchart of method S30 in an embodiment of this application;

[0043] Figure 5 This is a structural block diagram of the device according to an embodiment of this application;

[0044] Figure 6 This is a circuit diagram of a device according to an embodiment of this application.

[0045] The components include: 1. Busbar; 2. High-voltage disconnect switch; 3. High-voltage contactor; 4. Resistor; 5. Current transformer; 6. PLC control cabinet. Detailed Implementation

[0046] Various embodiments and features of this application are described herein with reference to the accompanying drawings.

[0047] It should be understood that various modifications can be made to the embodiments described herein. Therefore, the above description should not be considered as limiting, but merely as an example of embodiments. Other modifications within the scope and spirit of this application will be apparent to those skilled in the art.

[0048] The accompanying drawings, which are included in and form part of this specification, illustrate embodiments of the present application and, together with the general description of the present application given above and the detailed description of the embodiments given below, serve to explain the principles of the present application.

[0049] These and other features of this application will become apparent from the following description of preferred forms of embodiments given as non-limiting examples, with reference to the accompanying drawings.

[0050] It should also be understood that although this application has been described with reference to some specific examples, those skilled in the art can certainly implement many other equivalent forms of this application.

[0051] The above and other aspects, features and advantages of this application will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0052] Specific embodiments of this application are described thereafter with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of this application, which can be implemented in various ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that could obscure the application. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely serve as the basis and representative basis for the claims to teach those skilled in the art to use this application in a variety of substantially any suitable detailed structures.

[0053] This specification may use the phrases “in one embodiment,” “in another embodiment,” “in yet another embodiment,” or “in other embodiments,” all of which may refer to one or more of the same or different embodiments according to this application.

[0054] This application provides a control method based on a neutral point grounding resistor device, such as... Figure 1As shown, it is applied to the power supply side and includes:

[0055] S10. Obtain the grounding current signal and status signal of the power supply side;

[0056] S20. Based on the grounding current signal and the status signal, determine that the first target device is grounded, wherein the power supply side includes multiple devices that can be grounded.

[0057] In this embodiment, the ground current signal is obtained from a current transformer and is used to monitor the current flowing through the grounding path. Under normal conditions, the ground current should be very small or close to zero. If a ground fault occurs, this current will increase significantly. The status signal indicates the operating status of various devices (such as transformers, generators, switches, etc.), such as whether they are running, whether they are in a closed or open state, etc.

[0058] On the power supply side, there may be multiple devices that can be grounded, but based on the system's operating status and safety requirements, the most suitable device needs to be selected for grounding. The first target device refers to the device that is determined to be the priority grounding device among the multiple devices that can be grounded, according to a preset logic or algorithm.

[0059] For example, a power supply system has the following equipment: two generators (G1 and G2), a step-down transformer (T1), and multiple grounding resistors. This system needs to determine which equipment should be grounded first.

[0060] When the system starts running, the PLC control cabinet obtains the grounding current signal from the current transformer and the status signals from each device. The PLC control cabinet analyzes these signals and determines that G1 is the primary target device, requiring priority grounding. The PLC control cabinet issues a command to automatically close the grounding switch of G1 via the high-voltage contactor, grounding G1. After grounding, the system continues to monitor the grounding current and status of G1 to ensure successful grounding and system stability.

[0061] This method allows the power supply system to automatically and intelligently manage grounding status, improving system safety and reliability. It is particularly suitable for complex power supply networks containing multiple groundable devices that require precise control to prevent grounding faults or equipment damage.

[0062] In one embodiment, acquiring the status signal of the power supply side includes the following:

[0063] Obtain the position status signals of each grounding device in the power supply side;

[0064] Obtain the position status signal of the neutral point grounding isolation of the step-down transformer on the power supply side;

[0065] Obtain the position status signal of the grounding isolation of each neutral point in the power supply side;

[0066] Obtain the status signal of the incoming switch of the step-down transformer on the power supply side;

[0067] Obtain the status signal of the generator circuit breaker on the power supply side.

[0068] In this embodiment, acquiring status signals is a crucial step in ensuring the safe operation and effective monitoring of the system. These status signals provide real-time information on whether the equipment is working properly and whether it is in the expected position or state. Specifically:

[0069] Obtain the position status signals of each grounding device on the power supply side:

[0070] Monitor all grounding devices to ensure they are in the correct position, such as whether the grounding switch is closed, to ensure that the equipment is properly grounded when needed.

[0071] Obtain the neutral point grounding isolation status signal of the step-down transformer on the power supply side:

[0072] Monitoring whether the neutral point of the step-down transformer is grounded or isolated is crucial for controlling ground fault current and protecting the system.

[0073] Obtain the position status signal of the grounding isolation of each neutral point on the power supply side:

[0074] The system monitors the grounding isolation status of each neutral point to ensure that the fault area can be properly isolated in the event of a fault.

[0075] Obtain the status signal of the incoming switch of the step-down transformer on the power supply side:

[0076] Monitor whether the incoming switch of the step-down transformer is in the closed state to ensure the normal flow of electrical energy.

[0077] Obtain the status signal of the generator circuit breaker on the power supply side:

[0078] Monitor whether the generator circuit breaker is in the closed state to ensure that the generator can supply power to the grid, or to quickly cut off the power supply to protect the system when needed.

[0079] For example, a power supply system includes two generators (G1 and G2), a step-down transformer (T1), and corresponding grounding devices and control equipment.

[0080] When the system starts running, the PLC control cabinet acquires position status signals from each grounding device, such as whether the grounding switch is closed. The PLC control cabinet acquires the neutral point grounding isolation position status signal from T1 to determine whether the neutral point of T1 is grounded or isolated. The PLC control cabinet acquires grounding isolation position status signals from each neutral point in the system to ensure proper isolation of fault areas in the event of a fault. The PLC control cabinet acquires status signals from the incoming line switch sensor of T1 to ensure that electrical energy flows normally from the high-voltage grid to T1. The PLC control cabinet acquires status signals from the circuit breakers of G1 and G2 to ensure that the generator can supply power to the grid or quickly disconnect the power supply when needed.

[0081] By acquiring and analyzing these status signals in real time, the PLC control cabinet can automatically adjust the operating status of the equipment to ensure the safe and stable operation of the power supply system. This method is particularly suitable for automated and intelligent power systems, reducing human error and improving system response speed and reliability.

[0082] In one embodiment, such as Figure 2 As shown, the method further includes:

[0083] S30. If it is determined that the grounding current signal is abnormal, disconnect the grounding of the first target device;

[0084] S31. Re-determine the grounding of the second target device among the plurality of groundable devices.

[0085] In this embodiment, when the system detects an abnormal ground current signal (i.e., the ground current exceeds the normal value, indicating a possible ground fault), it will automatically disconnect the grounding connection of the previously identified first target device. This is done to isolate the faulty device, prevent the fault from spreading to other devices, and protect the system from damage.

[0086] After disconnecting the grounding of the first target device, the system needs to reassess the remaining devices to determine a new grounding target. This step involves selecting the most suitable device from among several possible devices for grounding to maintain stable system operation and grounding protection.

[0087] For example, a power supply system includes three generators (G1, G2 and G3) and a step-down transformer (T1), and all equipment may be grounded.

[0088] During normal system operation, G1 is identified as the primary target device and is already grounded. Suddenly, the PLC control cabinet detects an abnormal grounding current signal from G1, indicating a potential grounding fault. To isolate the fault, the PLC control cabinet automatically issues a command to disconnect the grounding connection of G1.

[0089] After the grounding of G1 is disconnected, the system needs to re-determine a new grounding target to maintain the system's grounding status. The PLC control cabinet analyzes the status signals of G2 and G3, as well as the neutral point grounding isolation status signal of T1. Assuming that the status signal of G2 indicates that it is operating normally and no abnormal grounding current has occurred, the PLC control cabinet will identify G2 as the second target device and automatically issue a command to ground G2.

[0090] Through this process, the power supply system can respond quickly to ground faults, isolate faulty equipment, and ensure continued stable system operation. This approach improves the flexibility and reliability of the power system and reduces the risk of power outages caused by ground faults.

[0091] In one embodiment, such as Figure 3 As shown, the method further includes:

[0092] S40. Determine a backup device from among the plurality of groundable devices;

[0093] S41. If it is determined that the first target device is abnormal, the backup device is switched to ground, wherein only one device is in the grounding state at any given time.

[0094] In this embodiment, in the power system, in addition to the equipment already identified as the primary grounding device, one or more backup devices are pre-selected for use in case the primary grounding device fails or malfunctions. Identifying backup devices is part of the power system redundancy design, aimed at improving system reliability and stability.

[0095] When the primary grounding device (the first target device) malfunctions, the system automatically switches to the backup device for grounding. This ensures that the grounding status of the power system is not interrupted due to the failure of a single device, while maintaining the safe operation of the system. Importantly, to maintain system stability and avoid chaotic grounding currents, only one device can be grounded at any given time.

[0096] For example, a power supply system includes four generators (G1, G2, G3 and G4) and a step-down transformer (T1), and all equipment may be grounded.

[0097] During normal system operation, G1 is designated as the primary grounding device and is already grounded. To improve system reliability, G2 is pre-designated as a backup device. This means that if G1 fails or malfunctions, G2 will be ready to take over the grounding task from G1.

[0098] During operation, the PLC control cabinet detected an abnormal grounding current signal from G1, indicating a potential grounding fault in G1. To isolate the fault and maintain the system's grounding status, the PLC control cabinet automatically issued a command to disconnect the grounding of G1 and switch to the standby device G2 for grounding. During this process, G3, G4, and T1 remain ungrounded, ensuring that only one device (currently G2) is grounded at any given time.

[0099] Through this process, the power supply system can respond quickly to ground faults, isolate faulty equipment, and ensure continued stable system operation. This approach improves the flexibility and reliability of the power system and reduces the risk of power outages caused by ground faults.

[0100] In one embodiment, the power supply side includes a step-down transformer, a generator, and a control cabinet, and the method further includes:

[0101] If the status signal of the step-down transformer is determined to be normal, the neutral point of the step-down transformer is grounded, and the neutral point of the generator is simultaneously disconnected from the ground.

[0102] If the status signal of the step-down transformer is found to be abnormal, the neutral point of any operating generator is determined to be grounded.

[0103] This embodiment relates to the grounding management strategy on the power supply side of the power system, particularly the grounding status management of step-down transformers and generators.

[0104] When the system detects that the status signal of the step-down transformer indicates that it is operating normally, it will take action to ground the neutral point of the step-down transformer to ensure system stability and safety. At the same time, in order to maintain a single grounding point, the neutral point grounding of the generator will be disconnected to avoid ground current diversion problems caused by multiple grounding points.

[0105] If the status signal of the step-down transformer shows an abnormality, indicating a possible fault or the need for maintenance, the system will not ground the neutral point of the step-down transformer. Instead, the system will select a running generator and ground its neutral point to ensure that the system remains grounded when the step-down transformer is unavailable, thus maintaining stable system operation.

[0106] For example, a power supply system includes two generators (G1 and G2), a step-down transformer (T1), and a control cabinet.

[0107] Under normal circumstances: The system detects that the status signal of T1 is normal, indicating that T1 is operating stably. According to the control strategy, the control cabinet issues a command to ground the neutral point of T1, and at the same time issues a command to release the neutral point grounding of G1 and G2, ensuring that the system has only one grounding point.

[0108] Abnormal Situation: The system detects an abnormal status signal from T1, possibly due to a fault or the need for maintenance. In this situation, the control cabinet needs to ensure the system remains grounded. The control cabinet analyzes the status signals of G1 and G2 and finds that G1 is running and in normal condition, while G2 is in a shutdown / maintenance state. The control cabinet issues a command to ground the neutral point of G1 to maintain the system's grounding state, while simultaneously keeping the neutral points of T1 and G2 ungrounded.

[0109] This control strategy allows the power supply system to flexibly manage grounding conditions, ensuring safe and stable operation under various circumstances. This approach helps reduce power outages caused by grounding issues and improves the reliability of power supply.

[0110] In one embodiment, such as Figure 4 As shown, determining that the ground current signal is abnormal includes:

[0111] S301. Compare the acquired grounding current signal with the preset target grounding current signal;

[0112] S302. Based on the comparison results, determine the state of the grounding current signal.

[0113] In this embodiment, the process of determining whether a ground current signal is abnormal is used for ground fault detection in a power system. The ground current signal is monitored in real time and compared to a pre-set target ground current signal. The target ground current signal is a safety threshold representing the expected ground current level in the absence of a ground fault. This threshold is typically determined based on system design and safety requirements.

[0114] After comparing the real-time ground current signal with the preset target ground current signal, the system determines the status of the ground current signal based on the comparison result. If the real-time ground current signal exceeds the preset target ground current signal, the system determines the ground current signal to be abnormal, indicating a possible grounding fault. If the real-time ground current signal is within the preset range, the ground current signal is considered normal.

[0115] For example, a power supply system includes a step-down transformer (T1) and a corresponding grounding device.

[0116] The system monitors the grounding current signal of T1 in real time, assuming the preset target grounding current signal is 0.5 amperes. At a certain moment, the system detects a grounding current signal of 1.0 amperes.

[0117] The system compares the detected ground current signal (1.0 amps) with the preset target ground current signal (0.5 amps). Since 1.0 amps exceeds 0.5 amps, the system determines that the ground current signal is abnormal, indicating that a ground fault may exist.

[0118] Based on this assessment, the system can take further measures, such as isolating the faulty area, issuing alarms, or automatically switching to backup equipment, to ensure the safe and stable operation of the power supply system. This method helps to detect and respond to grounding faults in a timely manner, reducing the impact of faults on the power system.

[0119] In one embodiment, the method further includes:

[0120] If the target device is found to be malfunctioning and its grounding has not been disconnected, an alarm signal is issued.

[0121] In this embodiment, in the handling of power system grounding faults, the actions that the system should take when a target device is determined to be abnormal but its grounding connection has not yet been disconnected.

[0122] During power system monitoring, if an abnormal status signal is detected in a target device (potentially indicating equipment failure or other problems), and this abnormal state has not yet been addressed (i.e., the target device's grounding has not been disconnected), the system will automatically issue an alarm signal. The purpose of this alarm signal is to immediately notify operators or automated systems so that further measures can be taken quickly, such as isolating the faulty device, switching to backup equipment, or performing maintenance, to protect the safe and stable operation of the power system.

[0123] For example, a power supply system includes two generators (G1 and G2) and a step-down transformer (T1), as well as corresponding grounding devices and control cabinets.

[0124] The system compares the real-time ground current signal with the preset target ground current signal to determine that the ground current signal of G1 is abnormal, indicating that G1 may have a ground fault. However, due to some reason (such as a delay or malfunction of the automatic control system), the ground connection of G1 has not yet been disconnected.

[0125] In this situation, the control cabinet will immediately issue an alarm signal. This signal may be an audible and visual alarm, a warning message sent to the control center, or an automatic notification to maintenance personnel. The alarm signal is issued to ensure that operators can quickly become aware of the abnormal state of G1 and take necessary measures to handle the problem, such as manually disconnecting the grounding connection of G1, checking the status of G1, or switching to the backup generator G2 to maintain power supply.

[0126] In this way, the power supply system can respond to potential faults in the first instance, reduce the impact of faults on the system, and ensure the continuity and reliability of power supply.

[0127] In one embodiment, the method further includes:

[0128] Record the operating data of the power supply side, including grounding current, grounding status, and operating history;

[0129] Analyze the operational data to optimize the operation and maintenance strategy of the neutral point grounding resistor device.

[0130] In this embodiment, the system continuously collects and records operational data from the power supply side. This data includes real-time values ​​of grounding current, the grounding status of equipment (e.g., whether the grounding switch is closed or open), and all historical records of grounding-related operations (e.g., when grounding or de-grounding operations were performed). This data is crucial for monitoring system status and analyzing system behavior.

[0131] The purpose of in-depth analysis of the collected operational data is to identify operating patterns, predict potential problems, and optimize the operation and maintenance strategies of the neutral point grounding resistance device accordingly. Through analysis, abnormal patterns in the data can be discovered, equipment failures can be predicted, maintenance plans can be optimized, unexpected power outages can be reduced, and the overall efficiency and reliability of the system can be improved.

[0132] For example, a power supply system includes three generators (G1, G2 and G3), a step-down transformer (T1) and corresponding grounding devices.

[0133] The system records the grounding current, grounding status, and historical records of all grounding operations for T1 and each generator in real time. For example, the system records a sudden increase in the grounding current of G1 at a certain point in time, and the subsequent grounding release operation.

[0134] The maintenance team regularly analyzes this operational data. Through analysis, they discovered that the grounding current of G1 frequently exceeds normal values ​​under specific conditions (such as peak load periods), indicating a potential cyclical load issue or equipment aging problem. Based on these findings, the team decided to perform preventative maintenance before peak load periods and adjust the grounding resistance settings to accommodate the operational requirements under high load conditions.

[0135] By recording and analyzing data in this way, power supply systems can more effectively manage their operation and maintenance, reduce failures, extend equipment lifespan, and improve power supply reliability. This approach facilitates condition-based maintenance strategies, rather than relying solely on time-based maintenance schedules.

[0136] This application provides a neutral point grounding resistor 4 device, including a busbar 1, the busbar 1 is connected to a high-voltage disconnect switch 2, the high-voltage disconnect switch 2 is connected to a high-voltage contactor 3, the high-voltage contactor 3 is connected to a grounding resistor 4, the grounding resistor 4 is connected to a current transformer 5 and a PLC control cabinet 6 respectively, and the high-voltage contactor 3 and the current transformer 5 are respectively connected to the PLC control cabinet 6.

[0137] In this embodiment, busbar 1 is a conductor used to distribute electrical energy in the power system. It is connected to high-voltage disconnect switch 2 and serves as the starting point of the grounding resistor 4 device. High-voltage disconnect switch 2 is used to isolate the equipment from the power supply when maintenance or repair is required, ensuring safe operation. It connects busbar 1 and high-voltage contactor 3 to control the on / off state of electrical energy.

[0138] The high-voltage contactor 3 is a device used for remotely controlling the switching of circuits. It connects the high-voltage disconnector 2 and the grounding resistor 4. In automatic control systems, the contactor can automatically close or open the circuit. The grounding resistor 4 is a resistor connected to the ground to limit ground fault current and protect the system from damage. It is connected to the high-voltage contactor 3 and provides a grounding path.

[0139] Current transformer 5 is used to measure the current flowing through grounding resistor 4. It is connected to grounding resistor 4 and transmits the measured current signal to PLC control cabinet 6. PLC control cabinet 6 is the control center of the entire grounding resistor 4 device. It receives signals from high-voltage contactor 3 and current transformer 5 and controls the operation of the grounding resistor 4 device according to these signals.

[0140] In this embodiment, when the system needs to be grounded, the PLC control cabinet 6 issues a command to close the high-voltage contactor 3, thereby connecting the grounding resistor 4 to the busbar 1 to achieve grounding. The current transformer 5 monitors the current flowing through the grounding resistor 4 and transmits the data to the PLC control cabinet 6 for real-time monitoring of the grounding current.

[0141] If an abnormal current or a change in system status is detected, the PLC control cabinet 6 can automatically or according to a preset program adjust the status of the grounding resistance 4 device, such as disconnecting the contactor, to protect system safety.

[0142] This grounding resistor 4 device is designed to protect equipment and personnel by limiting fault current in the event of a ground fault, while providing automated grounding control to improve system reliability and safety.

[0143] This application provides a neutral point grounding resistor device, applied to the power supply side, such as... Figure 5 As shown, it includes:

[0144] The acquisition module is configured to acquire the grounding current signal and status signal of the power supply side;

[0145] The determination module is configured to determine the grounding of a first target device based on the grounding current signal and the status signal, wherein the power supply side includes multiple devices that can be grounded.

[0146] It should be noted that the principle of the device provided in the embodiments of this application to solve the technical problem is similar to that of the method provided in the embodiments of this application. Therefore, the implementation of the device provided in the embodiments of this application can refer to the implementation of the method provided in the embodiments of this application, and the repeated parts will not be described again.

[0147] This application provides an electronic device, including a memory and a processor. The memory stores an executable program, and the processor executes the executable program to implement the steps of any of the methods provided in this application.

[0148] The aforementioned processor can be a general-purpose processor, a digital signal processor, an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The aforementioned PLD can be a complex programmable logic device (FPGA), a field-programmable gate array (FPGA), a generic array logic (GAL), or any combination thereof. The general-purpose processor can be a microprocessor or any conventional processor, etc.

[0149] Since the electronic device described in this application embodiment is an electronic device equipped with a memory for implementing the methods disclosed in this application embodiment, those skilled in the art can understand the structure and variations of the electronic device described in this application embodiment based on the methods described in this application embodiment, and therefore will not be repeated here.

[0150] This application also provides a computer-readable storage medium storing a computer program thereon, which, when run by a processor, implements the steps of any of the image processing methods provided in this application.

[0151] The storage medium in this embodiment may be included in an electronic device; or it may exist independently and not be assembled into an electronic device. The storage medium carries one or more computer programs, which, when executed, implement the steps of any of the task processing methods provided in the embodiments of this application.

[0152] It should be understood that the various solutions in this embodiment have the same technical effects as those in the above method embodiments, and will not be repeated here.

[0153] According to embodiments of this application, the computer-readable storage medium can be a non-volatile computer-readable storage medium, such as including but not limited to: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. Optionally, specific examples in this embodiment can refer to the examples described in any embodiment of this application, which will not be repeated here. Obviously, those skilled in the art should understand that the various modules or steps of this application described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. Optionally, they can be implemented using computer-executable program code, thereby storing them in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those presented here, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, this application is not limited to any particular hardware and software combination.

[0154] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. A control method based on a neutral point grounding resistance device, applied to the power supply side, characterized in that: include: Acquiring a ground current signal and a status signal of the power supply side; Based on the ground current signal and the state signal, it is determined that the first target device is grounded, wherein the power supply side includes a plurality of devices capable of being grounded.

2. The control method according to claim 1, characterized in that: The obtaining of the status signal of the power supply side comprises the following: Acquiring a position status signal of each grounding device in the power supply side; Acquire a position status signal of neutral point grounding isolation of the step-down transformer in the power supply side; Acquire a position status signal of ground isolation of each neutral point in the power supply side; Obtaining a status signal of an incoming line switch of a step-down transformer in the power supply side; A status signal of a generator circuit breaker in the power supply side is obtained.

3. The control method according to claim 1, characterized in that: The method further comprises: If it is determined that the ground current signal is abnormal, disconnecting the ground of the first target device; A second target device ground is re-determined among the plurality of groundable devices.

4. The control method according to claim 1, characterized in that: The method further comprises: determining a spare device among the plurality of groundable devices; When it is determined that the first target device is abnormal, the backup device is switched to ground, wherein only one device is in a grounded state at a time.

5. The control method according to claim 3, characterized in that: The power supply side includes a step-down transformer, a generator and a control cabinet, and the method further includes: When it is determined that the state signal of the step-down transformer is normal, the neutral point of the step-down transformer is grounded, and the neutral point grounding of the generator is decoupled; When it is determined that the state signal of the step-down transformer is abnormal, it is determined that the neutral point of any operating generator is grounded.

6. The control method according to claim 3, characterized in that: The determining that the ground current signal is abnormal includes: comparing the acquired ground current signal with a preset target ground current signal; According to the comparison result, the state of the ground current signal is determined.

7. The control method according to claim 1, characterized in that: The method further comprises: When it is determined that the target device is abnormal and the grounding of the target device is not disconnected, an alarm signal is issued.

8. The control method according to claim 1, characterized in that: The method further comprises: Recording the operating data of the power supply side, including grounding current, grounding status and operation history; The operating data is analyzed to optimize the operation and maintenance strategy of the neutral point grounding resistor device.

9. A neutral point grounding resistor device, applied to the power supply side, characterized in that: include: An acquisition module, configured to acquire a ground current signal and a state signal of the power supply side; A determination module is configured to determine that a first target device is grounded based on the ground current signal and the state signal, wherein the power supply side includes a plurality of devices capable of being grounded.

10. A neutral point grounding resistor device, characterized in that: The invention comprises a busbar (1), wherein the busbar (1) is connected to a high-voltage isolating switch (2), wherein the high-voltage isolating switch (2) is connected to a high-voltage contactor (3), wherein the high-voltage contactor (3) is connected to a grounding resistor (4), wherein the grounding resistor (4) is respectively connected to a current transformer (5) and a PLC control cabinet (6), and wherein the high-voltage contactor (3) and the current transformer (5) are respectively connected to the PLC control cabinet (6).

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