A GIS equipment fault rapid location system and method

Abstract

The present invention relates to the field of substation equipment fault location, and discloses a GIS equipment fault rapid location system and method. The system includes a signal acquisition module, a protection action behavior analysis and diagnosis module, and an ultra-high frequency partial discharge online monitoring module. The present invention analyzes and diagnoses the tripping information of the equipment in the station, outputs the GIS fault time, phase difference and location range information to the GIS ultra-high frequency online monitoring system, and retrieves the amplitude and discharge rate signals of the GIS ultra-high frequency sensor within the corresponding time, corresponding phase and corresponding location range through a dual-mode synchronous clock module. The GIS gas chamber with the greatest possibility of fault is determined by a signal strength amplitude location method. On the one hand, the number of GIS ultra-high frequency sensors retrieved is reduced, and on the other hand, the influence of interference signals is avoided, which significantly improves the positioning accuracy and efficiency of GIS equipment.

Description

Technical Field

[0001] The present invention relates to the field of substation equipment fault location, and in particular to a GIS equipment fault rapid location system and method. Background Art

[0002] At present, GIS (Gas Insulated Switchgear) combination electrical appliances are widely used in UHV AC stations due to their compact structure, small footprint, high operating reliability, no influence from the external environment, and convenient maintenance. However, GIS equipment manufacturing, transportation, on-site assembly, and lightning and operating overvoltage during operation may cause GIS insulation failure.

[0003] When a UHV GIS device fails, the fault can be located in a single gas chamber of the specific GIS device through SF6 component analysis. However, testing numerous gas chambers is labor-intensive and time-consuming, which is not conducive to the rapid recovery of GIS equipment and seriously affects the safe and stable operation of 1000kV UHV substations.

[0004] At present, the fault location of GIS equipment in the power system is mainly carried out by ultrasonic positioning method. The signal collected by the external ultrasonic sensor is connected to the oscilloscope for display or the corresponding central processing equipment for processing and analysis through wired transmission. However, the ultrasonic partial discharge positioning system is mainly used in GIS AC withstand voltage test, with a short application time and limited deployment range, and cannot effectively locate faults that occur during the operation of GIS equipment. Summary of the invention

[0005] The purpose of the present invention is to provide a system and method for quickly locating a fault of a GIS device, which can quickly locate the point where the fault of the GIS device occurs.

[0006] In order to achieve the above object, in one aspect, the present invention provides a GIS equipment fault rapid location system, comprising:

[0007] A signal acquisition module, used for collecting tripping signals;

[0008] The protection action behavior analysis and diagnosis module obtains the tripping signal and diagnoses and analyzes whether it is a GIS equipment failure in the station based on the tripping protection action status and the fault distance measurement information;

[0009] If it is determined that the GIS equipment in the station is faulty, the trip signal is associated with the primary equipment in the station, and the GIS fault time, phase difference and positioning range information are uploaded to the host computer control platform;

[0010] The UHF partial discharge online monitoring module is used to obtain the UHF sensor signal strength amplitude and discharge rate signal within the corresponding time, corresponding phase and corresponding positioning range through the synchronous clock module according to the GIS fault time, phase difference and positioning range information sent by the host computer main control platform, calculate the comprehensive index of the fault rate of each UHF sensor, determine the position of the faulty gas chamber according to the size of the comprehensive index of the fault rate, and upload the result to the host computer main control platform.

[0011] Preferably, the trip signal acquired by the protection action behavior analysis and diagnosis module is a trip signal after protocol conversion.

[0012] Preferably, the primary equipment in the associated station includes:

[0013] The reactive protection range is determined by the primary main wiring, and within the reactive protection range, the primary equipment wiring diagram is matched with the busbar, main transformer and line of the actual protection device.

[0014] Preferably, it also includes a fault range analysis module, which can narrow the fault location range according to the protection action of the differential protection devices of the busbar, main transformer and line when a fault occurs in the GIS station.

[0015] Preferably, the narrowing of the fault location range according to the protection action of the differential protection devices of the busbar, the main transformer and the line includes:

[0016] When two differential protection devices of the busbar, main transformer and line are in protection action at the same time, it is judged that the fault point is located at the intersection of the protection ranges of the two differential protection devices;

[0017] When the differential protection device of the line or main transformer is activated and the differential protection device of the busbar is not activated, it is judged that the fault point is located in the line earthing knife, isolation knife and earthing knife combination or the outlet bushing gas chamber;

[0018] When the differential protection device of the busbar is in action, but the differential protection devices of the main transformer and the line are not in action, it is determined that the fault point is located in the busbar gas chamber.

[0019] Preferably, the UHF sensor comprises a high pass filter with a lower cut-off frequency of 6000 MHz.

[0020] Preferably, the synchronous clock module is a Beidou + GPS dual-mode synchronous clock module.

[0021] Preferably, the calculation of the comprehensive index of the failure rate of each UHF sensor includes:

[0022] Determine transient characteristic frequency band based on GIS partial discharge characteristics;

[0023] Iterate the transient characteristic frequency band to each UHF sensor signal strength amplitude and discharge rate signal to form a two-dimensional function;

[0024] Through the EMD algorithm, singular data are obtained to form a comprehensive index of the failure rate of each UHF sensor.

[0025] On the other hand, the present invention discloses a method for quickly locating a GIS equipment fault, which is applied to the above-mentioned GIS equipment fault quickly locating system, comprising:

[0026] Determine whether the fault is caused by the GIS equipment in the station based on the tripping protection action and fault distance information;

[0027] If it is determined that the GIS equipment in the station is faulty, the fault occurrence time is determined based on the tripping protection action behavior, and the fault location range is narrowed;

[0028] Retrieve the time scale amplitude and discharge rate information corresponding to each UHF sensor within the positioning range;

[0029] The comprehensive index of the failure rate of each UHF sensor is obtained through the EMD algorithm;

[0030] The position of the faulty air chamber is outputted according to the magnitude relationship of the comprehensive index of the fault rate.

[0031] Preferably, the method for calculating the comprehensive failure rate index includes:

[0032] Determine the fault transient characteristic frequency band according to the GIS partial discharge characteristics, and construct the characteristic function s(w,v);

[0033] Read the discharge rate signal and signal strength amplitude of each UHF sensor to form the partial discharge function x(w,v);

[0034] The characteristic functions constructed by the characteristic frequency bands are respectively superimposed and subtracted from the partial discharge function to obtain D1(w,v) and D2(w,v);

[0035] Perform EMD decomposition on D1(w,v) and D2(w,v) to obtain D1'(w,v) and D2'(w,v);

[0036] Take the average of D1'(w,v) and D2'(w,v) to obtain the characteristic waveform x'(w,v);

[0037] Perform singular decomposition on x'(w,v);

[0038] Output the comprehensive index of failure rate of each UHF sensor.

[0039] Through the above technical solution, faults occurring during the operation of GIS equipment can be effectively located, the time for finding the fault point can be shortened, the faulty equipment can be isolated as soon as possible, and the purpose of quickly restoring power supply to the power-off equipment can be achieved, which is of great significance to the safe and stable operation of the power grid.

[0040] The present invention analyzes and diagnoses the tripping information of equipment in the station, outputs the GIS fault time, phase and positioning range information to the GIS UHF online monitoring system, and calls the GIS UHF sensor amplitude and discharge rate signal within the corresponding time, phase and positioning range through a dual-mode synchronous clock module. The GIS air chamber with the highest possibility of fault is determined by a positioning method based on signal strength amplitude. On the one hand, the number of GIS UHF sensors called is reduced, and on the other hand, the influence of interference signals is avoided, thereby significantly improving the positioning accuracy and efficiency of GIS equipment.

[0041] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0043] Figure 1 A schematic diagram of the structure of a GIS equipment fault rapid location system according to an embodiment of the present invention is shown;

[0044] Figure 2 A flow chart showing a method for quickly locating a GIS equipment fault according to an embodiment of the present invention is shown;

[0045] Figure 3 A flowchart for calculating a comprehensive index of a fault rate in a method for quickly locating a fault of a GIS device according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0046] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0047] Figure 1 The schematic diagram of the structure of the GIS equipment fault rapid location system according to one embodiment of the present invention is shown. Figure 1 , a GIS equipment fault rapid location system, including a signal acquisition module, a protection action behavior analysis and diagnosis module and a UHF partial discharge online monitoring module.

[0048] The signal acquisition module is used to collect tripping signals, the protection action behavior analysis and diagnosis module obtains the tripping signals, and diagnoses and analyzes whether it is a GIS equipment failure in the station based on the tripping protection action and the fault distance measurement information; when it is judged that the GIS equipment in the station is faulty, the tripping signal is associated with the primary equipment in the station, and the GIS fault time, phase difference and positioning range information are uploaded to the host computer main control platform. The ultra-high frequency partial discharge online monitoring module is used to obtain the UHF sensor signal strength amplitude and discharge rate signal within the corresponding time, corresponding phase and corresponding positioning range through the synchronous clock module according to the GIS fault time, phase difference and positioning range information issued by the host computer main control platform, calculate the comprehensive fault rate index of each UHF sensor, determine the location of the faulty gas chamber according to the size of the comprehensive fault rate index, and upload the result to the host computer main control platform, where the frequency band of the UHF sensor is 300-1800MHz.

[0049] The trip signal obtained by the protection action behavior analysis and diagnosis module is a trip signal after protocol conversion. Specifically, the trip signal is first uploaded to the integrated data network through the optical fiber, and after the protocol conversion is performed by the integrated data network, the trip signal is uploaded to the protection action behavior analysis and diagnosis module.

[0050] The primary equipment in the associated station is associated by the following method: the reaction protection range is determined by the primary main connection, and within the reaction protection range, the primary equipment wiring diagram is matched with the busbar, main transformer and line of the actual protection device, so as to realize the association between the primary and secondary equipment in the substation.

[0051] In addition, the GIS equipment fault rapid location system also includes a fault range analysis module. When a fault occurs in the GIS station, the fault location range is narrowed according to the protection action of the differential protection devices of the busbar, main transformer and line. The busbar, main transformer and line are important units in the power system grid structure.

[0052] The specific methods to narrow the fault location scope are as follows:

[0053] When two differential protection devices of the busbar, main transformer and line are in protection action at the same time, it is judged that the fault point is located at the intersection of the protection ranges of the two differential protection devices;

[0054] When the differential protection device of the line or main transformer is activated and the differential protection device of the busbar is not activated, it is judged that the fault point is located in the line earthing knife, isolation knife and earthing knife combination or the outlet bushing gas chamber;

[0055] When the differential protection device of the busbar is in action, but the differential protection devices of the main transformer and the line are not in action, it is determined that the fault point is located in the busbar gas chamber.

[0056] The UHF online monitoring system can detect electromagnetic wave signals in the range of 0.3 to 1.5 GHz. When a GIS device fails, it will generate obvious UHF electromagnetic wave signals. This electromagnetic wave signal can propagate far away along the pipe body of the GIS and be collected by UHF sensors installed on different pot-type insulators. Since GIS has many flange-connected pot-type insulators, turning structures and T-joints, disconnectors and circuit breakers and other discontinuous points, the UHF signal will inevitably be attenuated when passing through these structures during the propagation process in the GIS. Therefore, the fault point can be located by comparing the UHF signal amplitude and discharge rate collected by different sensors at the time of the fault. However, due to the large amount of interference on the UHV substation site, the amplitude and discharge rate of the interference signal collected at certain times are even higher than those at the time of the fault. Therefore, a high-pass filter with a lower cutoff frequency of 6000MHz is set in the UHF sensor. By setting the high-pass filter, the signal interference is eliminated, thereby significantly improving the positioning accuracy and efficiency.

[0057] The synchronous clock module is a Beidou + GPS dual-mode synchronous clock module, which can ensure the consistency of the time scale parameters of each UHF sensor and the time scale parameters of the protection action behavior analysis and diagnosis module. In addition, in the UHF partial discharge online monitoring module, the GIS fault time, phase difference and range information are sent from the host computer main control platform to the UHF partial discharge online monitoring module through optical fiber. The UHF partial discharge online monitoring module obtains the amplitude and discharge rate signals of the UHF sensors in the corresponding phase and range at the time of the fault through optical fiber transmission.

[0058] UHV GIS equipment adopts 3 / 2 wiring mode, and the protection configuration of GIS equipment adopts dual configuration. The protection range of the electrical quantity protection of busbar, line and main transformer (main transformer) overlaps. The fault location range can be narrowed to a certain extent according to the protection action behavior, but the narrowed fault location range is still large, and the workload of directly analyzing and locating the SF6 component is large. By analyzing and diagnosing the tripping information of the equipment in the station, the GIS fault time, phase difference and location range information are output to the GIS UHF online monitoring system. Through the synchronous clock module, the amplitude and discharge rate signal of the GIS UHF sensor in the corresponding time, phase difference and location range are retrieved. The GIS gas chamber with the greatest possibility of fault is determined by the signal strength amplitude location method, which reduces the number of UHF sensors to be retrieved.

[0059] Among them, the calculation method of the comprehensive index of the failure rate of the UHF sensor is as follows:

[0060] Determine transient characteristic frequency band based on GIS partial discharge characteristics;

[0061] Iterate the transient characteristic frequency band to each UHF sensor signal strength amplitude and discharge rate signal to form a two-dimensional function;

[0062] Through the EMD algorithm, singular data are obtained to form a comprehensive index of the failure rate of each UHF sensor.

[0063] On the other hand, this embodiment also discloses a method for quickly locating a GIS device fault, which is applied to the above-mentioned GIS device fault quickly locating system, including:

[0064] (1) Determine whether the fault is caused by the GIS equipment in the station based on the tripping protection action and fault distance information;

[0065] For example, when only the line protection is activated and the distance information is greater than 2 kilometers, it is not a GIS equipment failure within the station; when the distance information is less than 2 kilometers, it is a GIS equipment failure within the station.

[0066] (2) If it is determined that the fault is caused by the GIS equipment in the station, the fault occurrence time is determined based on the tripping protection action behavior, and the fault location range is narrowed; the tripping protection action behavior can be the corresponding switch position change action.

[0067] (3) Retrieve the time scale amplitude and discharge rate information corresponding to each UHF sensor within the positioning range. Specifically, according to the GIS fault time, phase difference and positioning range information sent by the host computer main control platform, the corresponding time, corresponding phase difference and UHF sensor signal strength amplitude and discharge rate signal within the corresponding positioning range are retrieved through the synchronous clock module.

[0068] (4) Obtain the comprehensive index of the failure rate of each UHF sensor through the EMD algorithm;

[0069] (5) Output the faulty air chamber location based on the magnitude relationship of the comprehensive failure rate index.

[0070] The methods to narrow the fault location range are as follows:

[0071] When two differential protection devices of the busbar, main transformer and line are in protection action at the same time, it is judged that the fault point is located at the intersection of the protection ranges of the two differential protection devices;

[0072] When the differential protection device of the line or main transformer is activated and the differential protection device of the busbar is not activated, it is judged that the fault point is located in the line earthing knife, isolation knife and earthing knife combination or the outlet bushing gas chamber;

[0073] When the differential protection device of the busbar is in action, but the differential protection devices of the main transformer and the line are not in action, it is determined that the fault point is located in the busbar gas chamber.

[0074] The calculation method of the comprehensive index of failure rate is as follows:

[0075] Determine the fault transient characteristic frequency band according to the GIS partial discharge characteristics, and construct the characteristic function s(w,v);

[0076] Read the discharge rate signal and signal strength amplitude of each UHF sensor to form the partial discharge function x(w,v);

[0077] The characteristic functions constructed by the characteristic frequency bands are superimposed and subtracted from the partial discharge function to obtain D1(w,v) and D2(w,v);

[0078] Perform EMD decomposition on D1(w,v) and D2(w,v) to obtain D1'(w,v) and D2'(w,v);

[0079] Take the average of D1'(w,v) and D2'(w,v) to obtain the characteristic waveform x'(w,v);

[0080] Perform singular decomposition on x'(w,v);

[0081] Output the comprehensive index of failure rate of each UHF sensor.

[0082] The present invention analyzes and diagnoses the tripping information of equipment in the station, outputs the GIS fault time, phase and positioning range information to the GIS UHF online monitoring system, and calls the GIS UHF sensor amplitude and discharge rate signal within the corresponding time, phase and positioning range through a dual-mode synchronous clock module. The GIS air chamber with the highest possibility of fault is determined by a positioning method based on signal strength amplitude. On the one hand, the number of GIS UHF sensors called is reduced, and on the other hand, the influence of interference signals is avoided, thereby significantly improving the positioning accuracy and efficiency of GIS equipment.

[0083] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0084] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A method for quickly locating GIS equipment faults, characterized in that: include: A positioning system, the positioning system comprising: A signal acquisition module, used for collecting tripping signals; The protection action behavior analysis and diagnosis module obtains the tripping signal and diagnoses and analyzes whether it is a GIS equipment failure in the station based on the tripping protection action status and the fault distance measurement information; If it is determined that the GIS equipment in the station is faulty, the trip signal is associated with the primary equipment in the station, and the GIS fault time, phase difference and positioning range information are uploaded to the host computer control platform; The UHF partial discharge online monitoring module is used to retrieve the UHF sensor signal strength amplitude and discharge rate signal within the corresponding time, corresponding phase and corresponding positioning range through the synchronous clock module according to the GIS fault time, phase difference and positioning range information issued by the host computer main control platform, calculate the comprehensive index of the fault rate of each UHF sensor, determine the position of the faulty air chamber according to the size of the comprehensive index of the fault rate, and upload the result to the host computer main control platform; Determine whether the fault is caused by the GIS equipment in the station based on the tripping protection action and fault distance information; If it is determined that the GIS equipment in the station is faulty, the fault occurrence time is determined based on the tripping protection action behavior, and the fault location range is narrowed; Retrieve the time scale amplitude and discharge rate information corresponding to each UHF sensor within the positioning range; The comprehensive index of the failure rate of each UHF sensor is obtained through the EMD algorithm; Outputting the position of the faulty air chamber according to the magnitude relationship of the comprehensive index of the fault rate; The method for calculating the comprehensive failure rate index includes: Determine the fault transient characteristic frequency band according to the GIS partial discharge characteristics, and construct the characteristic function s (w, v); Read the discharge rate signal and signal strength amplitude of each UHF sensor to form the partial discharge function x(w,v); The characteristic functions constructed by the characteristic frequency bands are respectively superimposed and subtracted from the partial discharge function to obtain D1(w,v) and D2(w,v); Perform EMD decomposition on D1(w,v) and D2(w,v) to obtain D1'(w,v) and D2'(w,v); Take the average of D1'(w,v) and D2'(w,v) to obtain the characteristic waveform x'(w,v); Perform singular decomposition on x'(w,v); Output the comprehensive index of failure rate of each UHF sensor.

2. The method for quickly locating GIS equipment faults according to claim 1, characterized in that: The trip signal acquired by the protection action behavior analysis and diagnosis module is a trip signal after protocol conversion.

3. The method for quickly locating GIS equipment faults according to claim 1, characterized in that: The primary equipment in the associated station includes: The reactive protection range is determined by the primary main wiring, and within the reactive protection range, the primary equipment wiring diagram is matched with the busbar, main transformer and line of the actual protection device.

4. The method for quickly locating GIS equipment faults according to claim 1, characterized in that: It also includes a fault range analysis module. When a fault occurs in a GIS station, the fault location range is narrowed according to the protection action of the differential protection devices of the busbar, main transformer and line.

5. The method for quickly locating GIS equipment faults according to claim 4 is characterized in that: The narrowing of the fault location range according to the protection action of the differential protection devices of the busbar, main transformer and line includes: When two differential protection devices of the busbar, main transformer and line are in protection action at the same time, it is judged that the fault point is located at the intersection of the protection ranges of the two differential protection devices; When the differential protection device of the line or main transformer is activated and the differential protection device of the busbar is not activated, it is judged that the fault point is located in the line earthing knife, isolation knife and earthing knife combination or the outlet bushing gas chamber; When the differential protection device of the busbar is in action, but the differential protection devices of the main transformer and the line are not in action, it is determined that the fault point is located in the busbar gas chamber.

6. The method for quickly locating GIS equipment faults according to claim 1, characterized in that: The UHF sensor includes a high pass filter with a lower cut-off frequency of 6000 MHz.

7. The method for quickly locating GIS equipment faults according to claim 1, characterized in that: The synchronous clock module is a Beidou + GPS dual-mode synchronous clock module.

8. The method for quickly locating GIS equipment faults according to claim 1, characterized in that: The calculation of the comprehensive index of the failure rate of each UHF sensor includes: Determine transient characteristic frequency band based on GIS partial discharge characteristics; Iterate the transient characteristic frequency band to each UHF sensor signal strength amplitude and discharge rate signal to form a two-dimensional function; Through the EMD algorithm, singular data are obtained to form a comprehensive index of the failure rate of each UHF sensor.

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