CN115201645A - Insulation monitoring method and device, storage medium and electronic device for power supply system - Google Patents

Abstract

The application relates to an insulation monitoring method and device, a storage medium and an electronic device for a power supply system, wherein the method comprises the steps of injecting pilot frequency auxiliary signals; positioning a ground fault in a power supply system by monitoring the pilot frequency auxiliary signal, wherein an intelligent positioning device is pre-installed in a switch of the power supply system and is used for sensing the pilot frequency auxiliary signal; and determining the position of the ground fault according to the intelligent positioning device. The method and the device realize accurate positioning by taking the injection signal as a criterion. And this application can also real-time supervision power supply system's insulating state to report an emergency and ask for help or increased vigilance when insulating reduction.

Description

Insulation monitoring method and device, storage medium and electronic device for power supply system

technical field

The present application relates to the field of insulation monitoring of power supply systems, and in particular, to insulation monitoring methods and devices, storage media, and electronic devices for power supply systems.

Background technique

Ground faults will occur in the power supply system for a long time, but when ground faults occur, they are usually monitored passively, which cannot meet the needs of active monitoring of ground faults.

There is a need for a power supply system insulation monitoring and fault diagnosis system for converting passive monitoring based on capacitive current criteria into active monitoring.

SUMMARY OF THE INVENTION

The main purpose of the present application is to provide an insulation monitoring method, device, storage medium, and electronic device for a power supply system, so as to solve the problem that the demand for active monitoring of ground faults cannot be met.

In order to achieve the above object, according to an aspect of the present application, an insulation monitoring method for a power supply system is provided.

An insulation monitoring method for a power supply system according to the present application includes: an insulation monitoring method for a power supply system, the method comprising: injecting an auxiliary signal of different frequencies; and locating a ground fault in the power supply system by monitoring the auxiliary signal of different frequencies , an intelligent positioning device is pre-installed in the switch of the power supply system, and the intelligent positioning device is used for sensing the inter-frequency auxiliary signal; according to the intelligent positioning device, the location of the ground fault is determined.

In some embodiments, the method further comprises: monitoring the insulation state of the power supply system in real time, and giving an alarm when the insulation is lowered.

In some embodiments, the determining the location where the ground fault occurs according to the intelligent positioning device includes:

When the intelligent positioning device senses the real-time information of the inter-frequency auxiliary signal, the real-time information of the inter-frequency auxiliary signal is shared through the ring network to determine the position of the switch;

According to the position of the switch, the location of the ground fault is determined.

In some embodiments, the switch includes a plurality of switches, and the plurality of switches form an area network, and determining the location where the ground fault occurs according to the location of the switch includes:

According to the cascade relationship between the upper and lower levels of multiple switches, the switch closest to the fault point is used as the target switch;

Determine the location of the ground fault based on the target switch and trip to remove the ground line.

In some embodiments, the method further includes: implementing information sharing of the intelligent positioning device based on Ethernet.

In some embodiments, the method further includes: automatically adjusting the frequency of the injected inter-frequency auxiliary signal at 0-50 Hz.

In some embodiments, the injecting the inter-frequency auxiliary signal further includes: when a single-phase grounding fault occurs in the power supply system, the zero-sequence voltage of the power supply system becomes larger, triggering the short-term switching of the inter-frequency signal source, and injecting all the auxiliary signals into the power supply circuit. The inter-frequency auxiliary signal.

In order to achieve the above object, according to another aspect of the present application, there is provided an insulation monitoring device for a power supply system, the device includes: an injection module for injecting an auxiliary signal of different frequencies; a monitoring module for passing through the monitoring system The inter-frequency auxiliary signal is used to locate the ground fault in the power supply system, and an intelligent positioning device is pre-installed in the switch of the power supply system, and the intelligent positioning device is used to sense the inter-frequency auxiliary signal; Intelligent positioning device to determine the location of the ground fault.

In order to achieve the above object, according to another aspect of the present application, a storage medium is also provided, where a computer program is stored in the storage medium, wherein the computer program is configured to execute any one of the above method embodiments when running steps in .

In order to achieve the above object, according to a further aspect of the present application, there is also provided an electronic device, comprising a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to run the computer program to execute Steps in any one of the above method embodiments.

In the insulation monitoring method and device, storage medium, and electronic device used in the power supply system in the embodiments of the present application, firstly inject an auxiliary signal with different frequencies, then locate the ground fault in the power supply system by monitoring the auxiliary signal with different frequencies, and finally according to The intelligent positioning device determines the location where the ground fault occurs. The effect of accurate positioning based on the injection signal is realized.

Description of drawings

The accompanying drawings, which constitute a part of this application, are used to provide a further understanding of the application and make other features, objects and advantages of the application more apparent. The accompanying drawings and descriptions of the exemplary embodiments of the present application are used to explain the present application, and do not constitute an improper limitation of the present application. In the attached image:

1 is a schematic diagram of an insulation monitoring method for a power supply system according to an embodiment of the present application;

2 is a schematic diagram of an insulation monitoring device for a power supply system according to an embodiment of the present application;

FIG. 3 is a schematic diagram of the implementation principle of an insulation monitoring method for a power supply system according to an embodiment of the present application.

Detailed ways

In order to make those skilled in the art better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only The embodiments are part of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the scope of protection of the present application.

It should be noted that the terms "first", "second", etc. in the description and claims of the present application and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances for the embodiments of the application described herein. Furthermore, the terms "comprising" and "having" and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those expressly listed Rather, those steps or units may include other steps or units not expressly listed or inherent to these processes, methods, products or devices.

In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", The orientation or positional relationship indicated by "vertical", "horizontal", "horizontal", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings. These terms are primarily used to better describe the present application and its embodiments, and are not intended to limit the fact that the indicated device, element, or component must have a particular orientation, or be constructed and operated in a particular orientation.

In addition, some of the above-mentioned terms may be used to express other meanings besides orientation or positional relationship. For example, the term "on" may also be used to express a certain attachment or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present application can be understood according to specific situations.

Furthermore, the terms "installed", "set up", "provided with", "connected", "connected", "socketed" should be construed broadly. For example, it may be a fixed connection, a detachable connection, or a unitary structure; it may be a mechanical connection, or an electrical connection; it may be directly connected, or indirectly connected through an intermediary, or between two devices, elements, or components. internal communication. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

It should be noted that the embodiments in the present application and the features of the embodiments may be combined with each other in the case of no conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

As shown in FIG. 1 , the insulation monitoring method for a power supply system in the embodiment of the present application specifically includes the following steps:

Step S110, injecting an auxiliary signal of different frequencies.

Using injection signal and intelligent positioning technology, when a ground fault occurs, it can effectively avoid the influence of arc suppression coils, frequency converters, etc., and change passive monitoring (based on capacitive current criterion) to active positioning (based on injection signal).

For example, when a single-phase ground fault occurs, the zero-sequence voltage in the power supply system increases, which will trigger a short-term switching of the inter-frequency signal source, and inject a signal of a special frequency into the power supply circuit of the power supply system. At the same time, the injected signal flows back to the signal source from the power supply loop-ground point-earth, thus forming a unique signal loop.

In step S120, the ground fault in the power supply system is located by monitoring the inter-frequency auxiliary signal, and an intelligent positioning device is pre-installed in the switch of the power supply system, and the intelligent positioning device is used for sensing the inter-frequency auxiliary signal.

The switches of the power supply system are used to control different power supply circuits, and an intelligent positioning device is pre-installed in the switches. It can be understood that the intelligent positioning device may be a passive or active tag. As shown in Figure 3, the intelligent positioning device is sensitive to the injected signal. After detecting the injected signal, the intelligent positioning devices share real-time information through the ring network. According to the shared information, #103, #105, #107 switches The area network is automatically formed. The #103, #105, and #107 switches determine that the #107 switch is closest to the fault point according to their respective upper and lower cascade relationships, and the #107 switch trips to remove the grounding line.

Step S130, according to the intelligent positioning device, determine the location where the ground fault occurs.

According to the intelligent positioning device, the relative position of the ground fault can be further determined. For example, which switch is close to, etc., so as to control the switch to operate. For another example, which switch is associated with, etc., so as to control the switch to operate.

In some embodiments, the method further comprises: monitoring the insulation state of the power supply system in real time, and giving an alarm when the insulation is lowered.

Through online monitoring of the insulation state of the power supply system, an intelligent alarm can be given to the fault, the original waveform data of the operation of the power supply system can be accurately recorded and analyzed after a fault occurs, and the parameters of the monitoring device can be adjusted remotely.

Preferably, fault recording analysis and remote management of setting values are also provided.

Preferably, it is also necessary to ensure the reliability of the operation of the power supply system insulation monitoring and fault diagnosis system software platform through the relevant gateway or system software, and prevent viruses or hackers from being attacked by the current situation of network viruses.

In some embodiments, the determining the location where the ground fault occurs according to the intelligent positioning device includes: when the intelligent positioning device senses the real-time information of the auxiliary signal with different frequencies, sharing the different frequencies through a ring network The real-time information of the auxiliary signal determines the position of the switch; according to the position of the switch, the position of the ground fault is determined.

Through the self-organized network of the intelligent positioning device, when the intelligent positioning device senses the real-time information of the inter-frequency auxiliary signal, it can further determine the position of the switch by sharing the real-time information of the inter-frequency auxiliary signal through the ring network.

In some embodiments, the switch includes a plurality of switches, and the plurality of switches form an area network, and determining the location where the ground fault occurs according to the location of the switch includes: a plurality of switches, according to their respective upper-lower-level cascade relationships, connect the The switch closest to the fault point is used as the target switch; the location of the ground fault is determined according to the target switch, and the grounding line is tripped off.

In some embodiments, the method further includes: implementing information sharing of the intelligent positioning device based on Ethernet.

If the dual power supply is operated separately and the dual power supply is operated in parallel, the effectiveness of signal injection is ensured by adding signal sources and intelligent positioning devices, intelligently monitoring how the positioning devices are adaptive, and automatically build a network to achieve accurate positioning. .

It should be noted that, during information sharing, it is necessary to ensure the real-time and reliability of the information sharing of the intelligent monitoring and positioning device based on Ethernet, for example, the information sharing delay is less than 2ms.

In some embodiments, the method further includes: automatically adjusting the frequency of the injected inter-frequency auxiliary signal at 0-50 Hz.

The frequency of the signal injected by the different frequency auxiliary signal source can be adjusted automatically within the range of 0-50Hz. In view of the fact that after the single-phase grounding fault occurs in the auxiliary signal source of different frequencies, the zero-sequence voltage of the system increases, triggering the short-term switching of the signal source of different frequencies, injecting a special frequency signal into the power supply circuit, and becoming passive based on the capacitive current criterion. Monitoring is active positioning based on the criteria of the injected signal to achieve accurate ground fault positioning.

Preferably, a special generating circuit is designed for the ground fault inter-frequency auxiliary signal.

Preferably, the ground fault inter-frequency auxiliary signal source has an automatic switching function.

Preferably, the solution of multi-signal source linkage blocking is adopted.

In some embodiments, the injecting the inter-frequency auxiliary signal further includes: when a single-phase grounding fault occurs in the power supply system, the zero-sequence voltage of the power supply system becomes larger, triggering the short-term switching of the inter-frequency signal source, and injecting all the auxiliary signals into the power supply circuit. The inter-frequency auxiliary signal.

It should be noted that the steps shown in the flowcharts of the accompanying drawings may be executed in a computer system, such as a set of computer-executable instructions, and, although a logical sequence is shown in the flowcharts, in some cases, Steps shown or described may be performed in an order different from that herein.

According to an embodiment of the present application, an insulation monitoring device for a power supply system for implementing the above method is also provided. As shown in FIG. 2 , the device includes:

The injection module 210 is used for injecting the inter-frequency auxiliary signal;

The monitoring module 220 is used to locate the ground fault in the power supply system by monitoring the inter-frequency auxiliary signal. An intelligent positioning device is pre-installed in the switch of the power supply system, and the intelligent positioning device is used to sense the inter-frequency auxiliary signal. ;

The positioning module 230 is configured to determine the location where the ground fault occurs according to the intelligent positioning device.

The injection module 210 in the embodiment of the present application is used for the injection signal and intelligent positioning technology. When a ground fault occurs, the influence of the arc suppression coil, the frequency converter, etc. can be effectively avoided, and the passive monitoring (based on the capacitive current criterion) can be effectively avoided. ) is active positioning (based on the injection signal).

For example, when a single-phase ground fault occurs, the zero-sequence voltage in the power supply system increases, which will trigger a short-term switching of the inter-frequency signal source, and inject a signal of a special frequency into the power supply circuit of the power supply system. At the same time, the injected signal flows back to the signal source from the power supply loop-ground point-earth, thus forming a unique signal loop.

The monitoring module 220 in the embodiment of the present application is used for pre-installing an intelligent positioning device in a switch of the power supply system for controlling different power supply circuits and in the switch. It can be understood that the intelligent positioning device may be a passive or active tag. As shown in Figure 3, the intelligent positioning device is sensitive to the injected signal. After detecting the injected signal, the intelligent positioning devices share real-time information through the ring network. According to the shared information, #103, #105, #107 switches The area network is automatically formed. The #103, #105, and #107 switches determine that the #107 switch is closest to the fault point according to their respective upper and lower cascade relationships, and the #107 switch trips to remove the grounding line.

The positioning module 230 in the embodiment of the present application is configured to further determine the relative position of the ground fault according to the intelligent positioning device. For example, which switch is close to, etc., so as to control the switch to operate. For another example, which switch is associated with, etc., so as to control the switch to operate.

Obviously, those skilled in the art should understand that the above-mentioned modules or steps of the present application can be implemented by a general-purpose computing device, and they can be centralized on a single computing device, or distributed in a network composed of multiple computing devices Alternatively, they can be implemented with program codes executable by a computing device, so that they can be stored in a storage device and executed by the computing device, or they can be made into individual integrated circuit modules, or they can be integrated into The multiple modules or steps are fabricated into a single integrated circuit module. As such, the present application is not limited to any particular combination of hardware and software.

In order to better understand the flow of the above-mentioned insulation monitoring method for a power supply system, the above-mentioned technical solutions are explained below with reference to the preferred embodiments, but are not used to limit the technical solutions of the embodiments of the present invention.

The insulation monitoring method for a power supply system in the embodiment of the present application first injects an inter-frequency auxiliary signal, then locates the ground fault in the power supply system by monitoring the inter-frequency auxiliary signal, and finally determines that a ground fault occurs according to the intelligent positioning device fault location. The effect of accurate positioning based on the injection signal is realized. The present application realizes the generation of inter-frequency auxiliary signal sources, the intelligent ground fault monitoring, the insulation monitoring and fault diagnosis methods of the power supply system based on the Linux operating system.

As shown in FIG. 3 , it is a schematic flowchart of an insulation monitoring method for a power supply system in an embodiment of the present application. The specific process of implementation includes the following steps:

The method of different frequency signal injection and intelligent monitoring and positioning can effectively avoid the influence of arc suppression coils, frequency converters, etc. when a ground fault occurs. The precise positioning is divided into the following three steps from passive monitoring to active positioning:

(1) After a single-phase ground fault occurs, the zero-sequence voltage of the system increases, triggering the short-term switching of the inter-frequency signal source, and injecting a special frequency signal into the power supply circuit.

(2) The injected signal flows back to the signal source from the "power supply loop-ground point-earth", thus forming a unique signal loop.

(3) The intelligent positioning device installed in the switch is sensitive to the injected signal. After detecting the injected signal, the devices share real-time information through the ring network. According to the shared information, #103, #105, #107 switches automatically form an area In the network, switches #103, #105, and #107 determine that the #107 switch is the closest to the fault point according to their respective upper and lower cascade relationships, and the #107 switch trips to remove the grounding line.

Embodiments of the present application further provide a storage medium, where a computer program is stored in the storage medium, wherein the computer program is configured to execute the steps in any one of the above method embodiments when running.

Optionally, in this embodiment, the above-mentioned storage medium may be configured to store a computer program for executing the following steps:

S1, inject the auxiliary signal of different frequency;

S2, locate the ground fault in the power supply system by monitoring the inter-frequency auxiliary signal, an intelligent positioning device is pre-installed in the switch of the power supply system, and the intelligent positioning device is used for sensing the inter-frequency auxiliary signal;

S3, according to the intelligent positioning device, determine the location where the ground fault occurs.

Optionally, in this embodiment, the above-mentioned storage medium may include but is not limited to: a USB flash drive, a read-only memory (Read-Only Memory, referred to as ROM), a random access memory (Random Access Memory, referred to as RAM), Various media that can store computer programs, such as removable hard disks, magnetic disks, or optical disks.

Embodiments of the present application further provide an electronic device, including a memory and a processor, where a computer program is stored in the memory, and the processor is configured to run the computer program to execute the steps in any one of the above method embodiments.

Optionally, the above-mentioned electronic device may further include a transmission device and an input-output device, wherein the transmission device is connected to the above-mentioned processor, and the input-output device is connected to the above-mentioned processor.

Optionally, in this embodiment, the above-mentioned processor may be configured to execute the following steps through a computer program:

S1, inject the auxiliary signal of different frequency;

S2, locate the ground fault in the power supply system by monitoring the inter-frequency auxiliary signal, an intelligent positioning device is pre-installed in the switch of the power supply system, and the intelligent positioning device is used for sensing the inter-frequency auxiliary signal;

S3, according to the intelligent positioning device, determine the location where the ground fault occurs.

Optionally, for specific examples in this embodiment, reference may be made to the examples described in the foregoing embodiments and optional implementation manners, and details are not described herein again in this embodiment.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims (10)

1. An insulation monitoring method for a power supply system, wherein the method comprises: Inject different frequency auxiliary signal; By monitoring the inter-frequency auxiliary signal, the ground fault in the power supply system is located, and an intelligent positioning device is pre-installed in the switch of the power supply system, and the intelligent positioning device is used for sensing the inter-frequency auxiliary signal; According to the intelligent positioning device, the location where the ground fault occurs is determined. 2 . The method according to claim 1 , further comprising: monitoring the insulation state of the power supply system in real time, and giving an alarm when the insulation decreases. 3 . 3 . The method according to claim 1 , wherein the determining the location where the ground fault occurs according to the intelligent positioning device comprises: 3 . When the intelligent positioning device senses the real-time information of the inter-frequency auxiliary signal, the real-time information of the inter-frequency auxiliary signal is shared through the ring network to determine the position of the switch; According to the position of the switch, the location of the ground fault is determined. 4 . The method according to claim 3 , wherein the switch comprises a plurality of switches, and the plurality of switches form an area network, and the determining the location where the ground fault occurs according to the location of the switch, comprising: 5 . According to the cascade relationship between the upper and lower levels of multiple switches, the switch closest to the fault point is used as the target switch; Determine the location of the ground fault based on the target switch and trip to remove the ground line. 5 . The method according to claim 1 , further comprising: implementing information sharing of the intelligent positioning device based on Ethernet. 6 . 6 . The method according to claim 1 , further comprising: automatically adjusting the frequency of the injected inter-frequency auxiliary signal at 0-50 Hz. 7 . 7. The method according to claim 1, wherein the injecting the inter-frequency auxiliary signal further comprises: When a single-phase grounding fault occurs in the power supply system, the zero-sequence voltage of the power supply system increases, triggering the short-term switching of the inter-frequency signal source, and injecting the inter-frequency auxiliary signal into the power supply circuit. 8. An insulation monitoring device for a power supply system, wherein the device comprises: The injection module is used to inject different frequency auxiliary signals; a monitoring module for locating the ground fault in the power supply system by monitoring the inter-frequency auxiliary signal, an intelligent positioning device is pre-installed in the switch of the power supply system, and the intelligent positioning device is used for sensing the inter-frequency auxiliary signal; The positioning module is used for determining the location where the ground fault occurs according to the intelligent positioning device. 9. A computer-readable storage medium, characterized in that a computer program is stored in the computer-readable storage medium, wherein the computer program is configured to execute any one of the claims 1 to 7 when running. method described. 10. An electronic device comprising a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to run the computer program to execute any one of claims 1 to 7 the method described.

Images