Intelligent insulation monitoring control device and method for direct current system

Abstract

The invention discloses an intelligent insulation monitoring control device and method for a direct current system, and relates to the technical field of power systems and equipment, and the device comprises a power management module, an MCU mainboard, a switching value output, a man-machine interaction display screen, an upward communication interface and a downward communication interface. The power manager is connected with positive and negative electrodes of the bus; the downward communication interface is responsible for collecting data information to the MCU mainboard; and the MCU main board judges whether the direct current system is grounded or not according to the collected data information, performs line selection operation on the intelligent line selection switch according to the branch leakage current data, and sends out an alarm signal after determining a grounded feeder line. Full-automatic operation of feeder line direct-current grounding fault line selection is achieved, and the novel line selection method reduces the false alarm rate of direct-current grounding fault line selection. The DC grounding fault can be quickly isolated, and the operation risk caused by the fault operation of the DC system is reduced. The direct-current air switch tripping reclosing function is achieved, quick trial closing can be achieved after an air switch trips accidentally, and the fault processing time is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems and equipment, and in particular to a direct current system intelligent insulation monitoring and control device and method. Background Art

[0002] The DC power supply system of the substation is a floating system, that is, an ungrounded system. If a DC grounding occurs, it must be handled as soon as possible, otherwise the risk of the protection device operation will increase. The existing DC insulation monitoring device has a single function and can only monitor the insulation condition of the system to the ground. When it detects that the insulation of the system feeder branch is reduced, an alarm signal is issued. The DC feeder grounding fault cannot be handled in time, and can only wait for the maintenance personnel to arrive at the site for post-processing. For unmanned stations, this undoubtedly increases the operating risk of substation equipment. In addition, even if the maintenance personnel arrive at the site, it will take a long time to find and handle the DC grounding fault. Sometimes it may take several days to find the grounding point. If another grounding point occurs during this period, it may cause protection malfunction, refusal to operate, and power circuit breaker tripping, etc., which will bring major safety hazards to the safe operation of the substation. In response to the above problems, this patent proposes an intelligent insulation monitoring and control device and method, which can realize automatic line selection when a DC system grounds a fault. After determining the feeder branch, the faulty feeder branch can be quickly isolated, and the operational risk of DC grounding fault can be eliminated in time, giving operation and maintenance personnel sufficient maintenance time, eliminating the operational risks caused by DC grounding in time, and ensuring the safe and reliable operation of the DC system when a grounding fault occurs. Summary of the invention

[0003] In view of the above-mentioned problems, the present invention is proposed.

[0004] Therefore, the technical problem solved by the present invention is to solve the problem that the existing DC insulation monitoring device has a single function and cannot handle the DC feeder grounding fault in time, thereby improving the operating safety and efficiency of the substation equipment.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a DC system intelligent insulation monitoring and control device, which comprises the following steps:

[0006] Power management module, MCU mainboard, switch output, human-computer interaction display screen, upward communication interface and downward communication interface; the power manager is connected to the positive and negative poles of the bus to provide working power for the device; the downward communication interface is responsible for collecting data information of the DC system to the MCU mainboard for data processing; the data information includes bus voltage data, bus-to-ground voltage data, branch leakage current data, and intelligent line selection switch information; the MCU mainboard determines whether the DC system is grounded based on the collected data information, and performs line selection operation on the intelligent line selection switch based on the branch leakage current data. After determining the grounded feeder, an alarm signal is sent to the background monitoring system through the switch output or the upward communication interface.

[0007] As a preferred solution of the intelligent insulation monitoring and control device for a DC system described in the present invention, monitoring and control are performed through the intelligent insulation monitoring and control device, the intelligent line selection switch component and the feeder leakage current CT.

[0008] The downward communication interface is connected to the intelligent line selection switch component, is responsible for communicating with the intelligent line selection switch component, is responsible for real-time monitoring of the insulation state of the DC system, and collects the position of the feeder circuit breaker and the feeder CT leakage current information sent by the intelligent line selection switch component.

[0009] The upward communication port is connected to the background monitoring system of the substation and is responsible for sending the operation data and alarm information of the DC power supply system to the background monitoring system.

[0010] As a preferred solution of the intelligent insulation monitoring and control device of a DC system described in the present invention, the intelligent line selection switch component is composed of a main circuit breaker, a secondary circuit breaker, a feeder CT and an electrical locking circuit, wherein the main circuit breaker is connected to the DC system bus of the station, the secondary circuit breaker is connected to the secondary bus, the operating power supply of the circuit breaker is connected to the corresponding DC bus, the circuit breaker communication interface is connected to the communication interface of the intelligent insulation monitoring and control device, and after the main and secondary circuit breaker outlet terminals are connected in parallel, the feeder passes through the leakage current CT to the feeder terminal block.

[0011] Another object of the present invention is to provide an intelligent insulation monitoring and control method for a DC system, which can quickly and accurately locate and handle DC feeder grounding faults through functions such as automatic line selection, fault isolation and real-time monitoring, thereby solving the problem that existing monitoring devices can only issue alarms but cannot handle faults in a timely manner.

[0012] In order to solve the above technical problems, the present invention provides the following technical solutions: a DC system intelligent insulation monitoring and control method, comprising:

[0013] The intelligent insulation monitoring and control device monitors the operating status of the DC system in real time through the CT acquisition bus and the circuit breaker control bus, collects the DC bus voltage, the DC positive bus voltage to ground, the DC negative bus voltage to ground, the circuit breaker position signal, and collects the leakage current of the branch through each feeder leakage current CT; when a ground fault occurs in the DC system, the intelligent insulation monitoring and control device detects that the DC voltage to ground is unbalanced, and the absolute value of the voltage difference between the positive and negative bus voltages to ground is greater than the set value, and starts the automatic line selection and fault isolation program according to the leakage current of each branch; when the program determines that the DC ground fault feeder branch is isolated from the system, the DC ground fault signal is sent to the background monitoring system; when a branch circuit breaker trips unexpectedly during operation, the tripped circuit breaker is reclosed.

[0014] As a preferred solution of the intelligent insulation monitoring and control method for a DC system described in the present invention, the automatic line selection and fault isolation program includes a normal line selection program and a special line selection program.

[0015] As a preferred scheme of the intelligent insulation monitoring and control method of a DC system described in the present invention, the normal line selection program includes: during normal operation, the main circuit breaker is in the closed position and the auxiliary circuit breaker is in the open position. When a DC grounding fault is detected, the corresponding intelligent line selection switch component is controlled according to the branch leakage current situation, starting from the branch number with the largest leakage current, that is, the auxiliary circuit breaker of the corresponding component is closed first, and the main circuit breaker is disconnected. First, it is detected whether the auxiliary bus voltage rises to the main bus voltage. If the voltage rises, the main circuit breaker is kept in the disconnected state, and the operation is directly jumped to the next branch with leakage current. When it is detected that the bus voltage to ground is restored to balance and the DC grounding fault phenomenon disappears, it is considered that the corresponding feeder branch has a grounding fault, the auxiliary circuit breaker is kept in the closed position, the main circuit breaker is kept in the open position, and the corresponding branch DC grounding signal is sent to the background monitoring. The control program continues to restore the non-fault feeder with a loop to the main bus operation mode, and the program ends.

[0016] As a preferred embodiment of the intelligent insulation monitoring and control method for a DC system described in the present invention, the special line selection program includes: if no grounding branch is found after switching all feeder branches with leakage current, the line selection switch components are controlled in sequence starting from the first branch, that is, the secondary circuit breaker of the corresponding component is closed first, and the main circuit breaker is disconnected. First, it is detected whether the secondary bus voltage rises to the main bus voltage. If the voltage rises, the main circuit breaker is kept disconnected, and the next branch is directly jumped to operate. If there is no loop, the ground voltage condition is judged. When it is detected that the bus voltage to ground is restored to balance and the DC grounding fault phenomenon disappears, it is considered that the corresponding feeder branch has a grounding fault, the secondary circuit breaker is kept in the closed position, and the main circuit breaker is kept in the disconnected position, and the corresponding branch DC grounding signal is sent to the background monitoring. The control program continues to restore the non-fault feeder with a loop to the main bus operation mode, and the program ends.

[0017] As a preferred solution of the intelligent insulation monitoring and control method of a DC system described in the present invention, the reclosing operation includes: if the circuit breaker trips accidentally during operation, a trial reclosing of the tripped circuit breaker is conducted; if the reclosing is successful, the program is terminated; if the reclosing is unsuccessful, the program is terminated after sending a circuit breaker fault tripping signal.

[0018] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above-mentioned intelligent insulation monitoring and control device for a DC system when executing the computer program.

[0019] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the above-mentioned intelligent insulation monitoring and control device for a DC system.

[0020] Beneficial effects of the present invention: The feeder DC grounding fault line selection is fully automatic, and the new line selection method greatly reduces the false alarm rate of DC grounding fault line selection. The DC grounding fault can be quickly isolated, greatly reducing the operating risk caused by the DC system running with a fault. It has a DC circuit breaker tripping and reclosing function, and can be quickly tried after the circuit breaker accidentally trips, without the need for operating personnel to go to the site for retrying, shortening the fault handling time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0022] Figure 1A basic structural diagram of a DC system intelligent insulation monitoring and control device provided for the first embodiment of the present invention.

[0023] Figure 2 A control diagram of a DC system intelligent insulation monitoring and control device provided in the first embodiment of the present invention.

[0024] Figure 3 An electrical interlock diagram for the operation of an intelligent line selection switch assembly in an intelligent insulation monitoring and control device for a DC system provided in the first embodiment of the present invention.

[0025] Figure 4 A main line diagram of an intelligent line selection switch component in an intelligent insulation monitoring and control device for a DC system provided in the first embodiment of the present invention.

[0026] Figure 5 A normal line selection procedure of a DC system intelligent insulation monitoring and control method provided in the second embodiment of the present invention.

[0027] Figure 6 A special line selection program of a DC system intelligent insulation monitoring and control method provided in the second embodiment of the present invention.

[0028] Figure 7 A circuit breaker reclosing program of a DC system intelligent insulation monitoring and control method is provided in accordance with the second embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0030] Example 1, reference Figure 1 to Figure 4 , is an embodiment of the present invention, and provides a DC system intelligent insulation monitoring and control device, characterized in that:

[0031] S1: Figure 1 As shown, a DC system intelligent insulation monitoring and control device includes a power management module, an MCU mainboard, a switch output, a human-computer interaction display screen, an upward communication interface, and a downward communication interface.

[0032] The power manager is connected to the positive and negative poles of the bus to provide working power for the device.

[0033] The lower communication interface is responsible for collecting data information of the DC system to the MCU mainboard for data processing;

[0034] The data information includes bus voltage data, bus-to-ground voltage data, branch leakage current data, and intelligent line selection switch information.

[0035] The MCU mainboard determines whether the DC system is grounded through the collected data information, and performs line selection operation on the intelligent line selection switch according to the branch leakage current data. After determining the grounded feeder, it sends an alarm signal to the background monitoring system through the switch output (hard contact) or the upper communication interface (soft message).

[0036] S2: Figure 2 As shown, monitoring and control are performed through an intelligent insulation monitoring and control device, an intelligent line selection switch component and a feeder leakage current CT.

[0037] The downward communication port is connected to the intelligent line selection switch component and is responsible for communicating with the intelligent line selection switch component. Its function is to monitor the insulation status of the DC system in real time and collect information such as the position of the feeder circuit breaker and the leakage current of the feeder CT sent by the intelligent line selection switch component. The upward communication port is connected to the background monitoring system of the substation and is responsible for sending the operating data and alarm information of the DC power supply system to the background monitoring system. In normal operation, in addition to the control of the feeder circuit breaker through the program software, an electrical interlocking circuit is also added, such as Figure 3 As shown, the purpose of this interlock is to prevent the DC load from losing power during switching. For example, if the auxiliary circuit breaker is not closed (closing failure or other reasons), if the main circuit breaker is disconnected at this time, the DC load will lose voltage. The circuit breaker must be in the closed position before another circuit breaker can be operated. Otherwise, the operating mechanism is locked and no operation is allowed.

[0038] S3: Figure 4 As shown, the intelligent line selection switch component consists of a main circuit breaker, a secondary circuit breaker, a feeder CT and an electrical locking circuit, wherein the main circuit breaker is connected to the DC system bus of the station, the secondary circuit breaker is connected to the secondary bus, the operating power supply of the circuit breaker is connected to the corresponding DC bus, the circuit breaker communication interface is connected to the communication interface of the intelligent insulation monitoring and control device, and after the main and secondary circuit breaker outlets are connected in parallel, the feeder passes through the leakage current CT to the feeder terminal block.

[0039] Example 2, reference Figure 5-Figure 7 , as an embodiment of the present invention, provides a method for a DC system intelligent insulation monitoring and control device, characterized in that:

[0040] The intelligent insulation monitoring and control device monitors the operation status of the DC system in real time through the CT acquisition bus and the air breaker control bus, collects the DC bus voltage, DC positive bus voltage to ground, DC negative bus voltage to ground, and air breaker position signal, and collects the leakage current of the branch through each feeder leakage current CT. When a ground fault occurs in the DC system, the device detects that the DC voltage to ground is unbalanced, and the absolute value of the voltage difference between the positive and negative bus voltages to ground is greater than the set value (≥15% of the DC nominal voltage). According to the leakage current of each branch, the automatic line selection and fault isolation program is started. When the program determines the DC ground fault feeder branch, the fault of the feeder branch is isolated from the system, and a DC ground fault signal is sent to the background monitoring system. When a branch air breaker trips unexpectedly during operation, a reclosing operation is performed on the tripped air breaker. If the air breaker reclosing fails, the reclosing program is terminated and a fault signal is sent.

[0041] The automatic line selection and fault isolation procedure includes a normal line selection procedure and a special line selection procedure.

[0042] like Figure 5 As shown, the normal line selection program includes: during normal operation, the main circuit breaker is in the closed position and the auxiliary circuit breaker is in the open position. When a DC grounding fault is detected, the corresponding intelligent line selection switch component is controlled and operated starting from the branch number with the largest leakage current according to the branch leakage current situation, that is, the auxiliary circuit breaker of the corresponding component is closed first, and the main circuit breaker is disconnected. First, it is detected whether the auxiliary bus voltage rises to the main bus voltage. If the voltage rises, the main circuit breaker is kept in the disconnected state, and the next branch with leakage current is directly jumped to operate. When it is detected that the bus voltage to ground is restored to balance and the DC grounding fault phenomenon disappears, it is considered that the corresponding feeder branch has a grounding fault, and the auxiliary circuit breaker is kept in the closed position and the main circuit breaker is disconnected. A DC grounding signal of the corresponding branch is sent to the background monitoring, and the control program continues to restore the non-fault feeder with a loop to the main bus operation mode, and the program ends.

[0043] like Figure 6 As shown, the special line selection program includes: if no grounding branch is found after switching all feeder branches with leakage current, the line selection switch components are controlled and operated in sequence starting from the first branch, that is, the auxiliary circuit breaker of the corresponding component is closed first, and the main circuit breaker is disconnected. First, it is detected whether the auxiliary bus voltage rises to the main bus voltage. If the voltage rises, the main circuit breaker is kept disconnected, and the operation is directly jumped to the next branch. If there is no loop, the ground voltage condition is judged. When it is detected that the bus voltage to ground is restored to balance and the DC grounding fault phenomenon disappears, it is considered that the corresponding feeder branch has a grounding fault, the auxiliary circuit breaker is kept in the closed position, the main circuit breaker is kept in the disconnected position, and the corresponding branch DC grounding signal is sent to the background monitoring, and the control program continues to restore the non-fault feeder with a loop to the main bus operation mode, and the program ends.

[0044] like Figure 7As shown, the reclosing operation includes: if the circuit breaker trips unexpectedly during operation, a trial is made to reclose the tripped circuit breaker. If the reclosing is successful, the program ends. If the reclosing is unsuccessful, the program ends after sending a circuit breaker fault tripping signal.

[0045] The comparison between the beneficial effects of the present invention and the existing device technology is shown in Table 1.

[0046] Table 1 Effect comparison

[0047]

[0048] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program code.

[0049] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0050] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0051] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0052] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A DC system intelligent insulation monitoring and control device, characterized in that: include: Power management module, MCU mainboard, switch output, human-computer interaction display screen, upward communication interface and downward communication interface; The power manager is connected to the positive and negative electrodes of the busbar to provide working power for the device; The downward communication interface is responsible for collecting data information of the DC system to the MCU mainboard for data processing; The data information includes bus voltage data, bus-to-ground voltage data, branch leakage current data, and intelligent line selection switch information; The MCU mainboard determines whether the DC system is grounded through the collected data information, and performs line selection operation on the intelligent line selection switch according to the branch leakage current data. After determining the grounded feeder, an alarm signal is sent to the background monitoring system through the switch output or the upper communication interface.

2. A DC system intelligent insulation monitoring and control device as claimed in claim 1, characterized in that: Monitoring and control are performed through the intelligent insulation monitoring and control device, the intelligent line selection switch component and the feeder leakage current CT; The downward communication interface is connected to the intelligent line selection switch component, responsible for communicating with the intelligent line selection switch component, responsible for real-time monitoring of the insulation state of the DC system, and collecting the position of the feeder circuit breaker and the feeder CT leakage current information sent by the intelligent line selection switch component; The upward communication port is connected to the background monitoring system of the substation and is responsible for sending the operation data and alarm information of the DC power supply system to the background monitoring system.

3. A DC system intelligent insulation monitoring and control device as claimed in claim 2, characterized in that: The intelligent line selection switch assembly consists of a main circuit breaker, a secondary circuit breaker, a feeder CT and an electrical locking circuit, wherein the main circuit breaker is connected to the DC system bus of the station, the secondary circuit breaker is connected to the secondary bus, the operating power supply of the circuit breaker is connected to the corresponding DC bus, the circuit breaker communication interface is connected to the communication interface of the intelligent insulation monitoring and control device, and after the main and secondary circuit breaker outlets are connected in parallel, the feeder passes through the leakage current CT to the feeder terminal block.

4. A method using a DC system intelligent insulation monitoring and control device as claimed in any one of claims 1 to 3, characterized in that: include: The intelligent insulation monitoring and control device monitors the operation status of the DC system in real time through the CT acquisition bus and the circuit breaker control bus, collects the DC bus voltage, DC positive bus voltage to ground, DC negative bus voltage to ground, circuit breaker position signal, and collects the leakage current of the branch through each feeder leakage current CT; When a ground fault occurs in the DC system, the intelligent insulation monitoring and control device detects that the DC voltage to ground is out of balance, and the absolute value of the voltage difference between the positive and negative busbars to ground is greater than the set value. According to the leakage current of each branch, the automatic line selection and fault isolation program is started; When the program determines that a DC ground fault feeder branch exists, the fault of the feeder branch is isolated from the system and a DC ground fault signal is sent to the background monitoring system; When a circuit breaker of a branch circuit breaker trips unexpectedly during operation, a reclosing operation will be performed on the tripped circuit breaker.

5. A DC system intelligent insulation monitoring and control method as claimed in claim 4, characterized in that: The automatic line selection and fault isolation procedure includes a normal line selection procedure and a special line selection procedure.

6. A DC system intelligent insulation monitoring and control method as claimed in claim 5, characterized in that: The normal line selection program includes: during normal operation, the main circuit breaker is in the closed position and the auxiliary circuit breaker is in the open position. When a DC grounding fault is detected, the corresponding intelligent line selection switch component is controlled and operated starting from the branch number with the largest leakage current according to the branch leakage current situation, that is, the auxiliary circuit breaker of the corresponding component is closed first, and the main circuit breaker is disconnected. First, it is detected whether the auxiliary bus voltage rises to the main bus voltage. If the voltage rises, the main circuit breaker is kept in the disconnected state, and the operation is directly jumped to the next branch with leakage current. When it is detected that the bus voltage to ground is restored to balance and the DC grounding fault phenomenon disappears, it is considered that the corresponding feeder branch has a grounding fault, the auxiliary circuit breaker is kept in the closed position, and the main circuit breaker is kept in the open position, and the corresponding branch DC grounding signal is sent to the background monitoring, and the control program continues to restore the non-fault feeder with a loop to the main bus operation mode, and the program ends.

7. A DC system intelligent insulation monitoring and control method as claimed in claim 6, characterized in that: The special line selection procedure includes: if no grounding branch is found after switching all feeder branches with leakage current, the line selection switch components are controlled and operated in sequence starting from the first branch, that is, the secondary circuit breaker of the corresponding component is closed first, and the main circuit breaker is disconnected. First, it is detected whether the secondary bus voltage rises to the main bus voltage. If the voltage rises, the main circuit breaker is kept disconnected, and the operation is directly jumped to the next branch. If there is no loop, the ground voltage condition is judged. When it is detected that the bus voltage to the ground is restored to balance and the DC grounding fault phenomenon disappears, it is considered that the corresponding feeder branch has a grounding fault, the secondary circuit breaker is kept in the closed position, and the main circuit breaker is kept in the disconnected position, and the corresponding branch DC grounding signal is sent to the background monitoring, and the control program continues to restore the non-fault feeder with a loop to the main bus operation mode, and the program ends.

8. A DC system intelligent insulation monitoring and control method according to claim 7, characterized in that: The reclosing operation includes: if the circuit breaker trips unexpectedly during operation, a reclosing attempt is made to the tripped circuit breaker; if the reclosing is successful, the program ends; if the reclosing is unsuccessful, the program ends after a circuit breaker fault tripping signal is sent.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the intelligent insulation monitoring and control device for a DC system according to any one of claims 1 to 3 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the intelligent insulation monitoring and control device for a DC system described in any one of claims 1 to 3 are implemented.

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