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CN-121476810-B - Method and device for detecting internal faults of insulating oil filled power equipment

CN121476810BCN 121476810 BCN121476810 BCN 121476810BCN-121476810-B

Abstract

The application discloses a method and a device for detecting internal faults of insulating oil filled power equipment, which relate to the technical field of power equipment state monitoring and calculate the volume percentage of each characteristic gas in an insulating oil sample in total characteristic gas; two characteristic gases are selected from the three characteristic gases and used as a first gas and a second gas respectively, a rectangular coordinate system taking the volume percentage of the first gas as a horizontal axis variable and the volume percentage of the second gas as a vertical axis variable is constructed, a target area in the rectangular coordinate system is determined to be a fault diagnosis space, the target area is divided into a plurality of fault areas which are not overlapped with each other according to a fault classification rule, the volume percentage of the first gas is used as an abscissa, the volume percentage of the second gas is used as an ordinate, a target coordinate point is obtained, and a target fault type is determined according to the fault area where the target coordinate point is located. Thus, the detection accuracy is ensured and the detection efficiency is improved.

Inventors

  • LI YUNGE
  • TANG ZIZHUO
  • HAN YANHUA

Assignees

  • 国网陕西省电力有限公司电力科学研究院

Dates

Publication Date
20260508
Application Date
20260108

Claims (9)

  1. 1. An insulating oil filled power equipment internal fault detection method, characterized by comprising: Acquiring an insulating oil sample of insulating oil filled power equipment in an operating state; detecting the volume concentrations of three characteristic gases in the insulating oil sample; Normalizing the volume concentration of the characteristic gas to obtain the volume percentage of each characteristic gas in the total characteristic gas; Two characteristic gases are selected from the three characteristic gases and are respectively used as a first gas and a second gas, and a rectangular coordinate system with the volume percentage of the first gas as a horizontal axis variable and the volume percentage of the second gas as a vertical axis variable is constructed; Determining a target area in the rectangular coordinate system as a fault diagnosis space, wherein the target area is an isosceles rectangular triangle, a coordinate origin is a right-angle vertex of the isosceles rectangular triangle, a right transverse half shaft is a first right-angle side, an upper longitudinal half shaft is a second right-angle side, and the lengths of the first right-angle side and the second right-angle side are 100; Dividing the target area into a plurality of non-overlapping fault areas according to a fault classification rule, wherein each fault area corresponds to one fault type; taking the volume percentage of the first gas as an abscissa and the volume percentage of the second gas as an ordinate to obtain a target coordinate point; determining a target fault type according to the fault area where the target coordinate point is located; Outputting the target fault type; Wherein, under the condition that the three characteristic gases are acetylene, ethylene and methane, the fault region comprises a partial discharge PD region, a low heat fault T1 region, a medium heat fault T2 region, a high heat fault T3 region, a low energy discharge D1 region, a high energy discharge D2 region and a mixed fault DT region, wherein the high energy discharge D2 region comprises a first high energy discharge subarea and a second high energy discharge subarea, and the mixed fault DT region comprises a first mixed fault subarea, a second mixed fault subarea and a third mixed fault subarea; the partial discharge PD region has a region range in which the sum of the volume percentages of the acetylene and the ethylene is not more than 2; The area range of the low-heat fault T1 area is that the volume percentage of acetylene is not more than 4, the volume percentage of ethylene is not more than 20, and the sum of the volume percentages of acetylene and ethylene is more than 2; The area range of the medium heat fault T2 area is that the volume percentage of acetylene is not more than 4, and the volume percentage of ethylene is not less than 20 and not more than 50; the area range of the high heat fault T3 area is that the volume percentage of acetylene is not more than 15, the volume percentage of ethylene is more than 50, and the sum of the volume percentages of acetylene and ethylene is not more than 100; the area range of the low-energy discharge D1 area is that the volume percentage of acetylene is more than 13, the volume percentage of ethylene is not more than 23, and the sum of the volume percentages of acetylene and ethylene is not more than 100; the area range of the first high-energy discharge subarea is that the volume percentage of acetylene is more than 13 and not more than 29, and the volume percentage of ethylene is more than 23 and not more than 40; the area range of the second high-energy discharge subarea is that the volume percentage of acetylene is more than 29, the volume percentage of ethylene is more than 23, and the sum of the volume percentages of acetylene and ethylene is not more than 100; The area range of the first mixed fault subarea is that the volume percentage of acetylene is more than 4 and not more than 13, and the volume percentage of ethylene is not more than 40; The area range of the second mixed fault sub-area is that the volume percentage of acetylene is more than 4 and not more than 29, and the volume percentage of ethylene is not less than 40 and not more than 50; The area range of the third mixed fault sub-area is that the volume percentage of acetylene is more than 15 and not more than 29, the volume percentage of ethylene is more than 50, and the sum of the volume percentages of acetylene and ethylene is not more than 100.
  2. 2. The method for detecting an internal fault of an insulating oil filled power device according to claim 1, wherein preset fault classification rules corresponding to different types of insulating oil filled power devices are different.
  3. 3. The method for detecting an internal fault of an insulating oil filled power device according to claim 1, wherein the three kinds of characteristic gases include the first gas, the second gas and the third gas, and the normalizing the volume concentration of the characteristic gases to obtain the volume percentage of each characteristic gas in the total characteristic gases includes: respectively carrying out normalization treatment on the volume concentrations of the first gas and the second gas to obtain the volume percentages of the first gas and the second gas in the total characteristic gas; and calculating the volume percentage of the third gas in the total characteristic gas based on the following formula: ; Wherein, the Represents the volume percent of the third gas in the total characteristic gas, Representing the volume percent of the first gas in the total characteristic gas, Representing the volume percent of the second gas in the total characteristic gas.
  4. 4. The method for detecting an internal fault of an insulating oil filled power apparatus according to claim 1, wherein the fault classification rule is IEC 60599 standard determined by a dewall equilateral triangle pattern tool.
  5. 5. The method for detecting an internal fault of an insulating oil filled power device according to claim 4, wherein the dividing the target area into a plurality of fault areas that do not overlap each other according to a fault classification rule comprises: acquiring volume percentage thresholds of gases corresponding to different fault types based on the IEC 60599 standard; Converting the volume percentage threshold of the gas into a linear boundary corresponding to the fault type; dividing the target area into a plurality of fault areas which are not overlapped with each other according to the linear boundary.
  6. 6. An insulating oil filled power equipment internal fault detection device, characterized by comprising: the first acquisition module is used for acquiring an insulating oil sample of insulating oil filling power equipment in an operating state; the detection module is used for detecting the volume concentration of three characteristic gases in the insulating oil sample; The normalization processing module is used for carrying out normalization processing on the volume concentration of the characteristic gas to obtain the volume percentage of each characteristic gas in the total characteristic gas; The construction module is used for selecting two characteristic gases from the three characteristic gases, respectively serving as a first gas and a second gas, and constructing a rectangular coordinate system with the volume percentage of the first gas as a horizontal axis variable and the volume percentage of the second gas as a vertical axis variable; The first determining module is used for determining a target area in the rectangular coordinate system as a fault diagnosis space, wherein the target area is an isosceles right triangle, a coordinate origin is a right-angle vertex of the isosceles right triangle, a right transverse half shaft is a first right-angle side, an upper longitudinal half shaft is a second right-angle side, and the lengths of the first right-angle side and the second right-angle side are 100; The dividing module is used for dividing the target area into a plurality of non-overlapping fault areas according to a fault classification rule, wherein each fault area corresponds to one fault type; the second acquisition module is used for obtaining a target coordinate point by taking the volume percentage of the first gas as an abscissa and the volume percentage of the second gas as an ordinate; the second determining module is used for determining a target fault type according to the fault area where the target coordinate point is located; the output module is used for outputting the target fault type; Wherein, under the condition that the three characteristic gases are acetylene, ethylene and methane, the fault region comprises a partial discharge PD region, a low heat fault T1 region, a medium heat fault T2 region, a high heat fault T3 region, a low energy discharge D1 region, a high energy discharge D2 region and a mixed fault DT region, wherein the high energy discharge D2 region comprises a first high energy discharge subarea and a second high energy discharge subarea, and the mixed fault DT region comprises a first mixed fault subarea, a second mixed fault subarea and a third mixed fault subarea; the partial discharge PD region has a region range in which the sum of the volume percentages of the acetylene and the ethylene is not more than 2; The area range of the low-heat fault T1 area is that the volume percentage of acetylene is not more than 4, the volume percentage of ethylene is not more than 20, and the sum of the volume percentages of acetylene and ethylene is more than 2; The area range of the medium heat fault T2 area is that the volume percentage of acetylene is not more than 4, and the volume percentage of ethylene is not less than 20 and not more than 50; the area range of the high heat fault T3 area is that the volume percentage of acetylene is not more than 15, the volume percentage of ethylene is more than 50, and the sum of the volume percentages of acetylene and ethylene is not more than 100; the area range of the low-energy discharge D1 area is that the volume percentage of acetylene is more than 13, the volume percentage of ethylene is not more than 23, and the sum of the volume percentages of acetylene and ethylene is not more than 100; the area range of the first high-energy discharge subarea is that the volume percentage of acetylene is more than 13 and not more than 29, and the volume percentage of ethylene is more than 23 and not more than 40; the area range of the second high-energy discharge subarea is that the volume percentage of acetylene is more than 29, the volume percentage of ethylene is more than 23, and the sum of the volume percentages of acetylene and ethylene is not more than 100; The area range of the first mixed fault subarea is that the volume percentage of acetylene is more than 4 and not more than 13, and the volume percentage of ethylene is not more than 40; The area range of the second mixed fault sub-area is that the volume percentage of acetylene is more than 4 and not more than 29, and the volume percentage of ethylene is not less than 40 and not more than 50; The area range of the third mixed fault sub-area is that the volume percentage of acetylene is more than 15 and not more than 29, the volume percentage of ethylene is more than 50, and the sum of the volume percentages of acetylene and ethylene is not more than 100.
  7. 7. An electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the method of detecting an internal fault of an insulating oil filled electrical device according to any one of claims 1 to 5 when the computer program is executed by the processor.
  8. 8. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program which, when executed by a processor, implements the insulating oil filled power apparatus internal fault detection method of any one of claims 1 to 5.
  9. 9. A computer program product comprising computer instructions which, when executed by a processor, implement the insulating oil filled electrical equipment internal fault detection method of any one of claims 1-5.

Description

Method and device for detecting internal faults of insulating oil filled power equipment Technical Field The application relates to the technical field of power equipment state monitoring, in particular to a method and a device for detecting internal faults of insulating oil filled power equipment. Background Electrical equipment such as transformers typically employ insulating oil as a cooling and insulating medium. When the inside of the equipment is overheated and has faults such as discharge, the insulating oil can be cracked under the action of high temperature or electric field to generate hydrogen gas) Methane) The ethane is) Ethylene) Acetylene [ ]) And the like. By analyzing these characteristic gases dissolved in the insulating oil, the type and severity of the fault inside the apparatus can be effectively diagnosed, which is called DGA (dissolved gas analysis ). In the related art, international electrotechnical Commission Standard IEC 60599 (use of mineral oil filled Electrical apparatus in service-guidance ,Mineral oil-filled electrical equipment in service - Guidance on the interpretation of dissolved and free gases analysis） on interpretation of dissolved and free gas analysis suggests a variety of DGA diagnostic methods in which Dewar equilateral triangle method is widely used for its intuitiveness and accuracy、AndThe volume percentages of the three gases are taken as three coordinate axes to divide the interior of the triangle into a plurality of fault areas. However, determining the fault area based on the Dewar equilateral triangle method may have the problems that complicated trigonometric function calculation and coordinate projection transformation are required for fault point visualization, so that software logic is complex, additional hardware resources are required for embedded implementation, and hardware implementation cost is high. Disclosure of Invention In view of the above, the application provides a method and a device for detecting faults in insulating oil filled power equipment, which can improve the detection efficiency while ensuring the detection accuracy. The aim of the application can be achieved by the following technical scheme: The first aspect of the application provides a method for detecting an internal fault of insulating oil filled power equipment, which comprises the following steps: Acquiring an insulating oil sample of insulating oil filled power equipment in an operating state; Detecting the volume concentration of three characteristic gases in an insulating oil sample; Normalizing the volume concentration of the characteristic gases to obtain the volume percentage of each characteristic gas in the total characteristic gases; Two kinds of characteristic gases are selected from the three kinds of characteristic gases and are respectively used as first gas and second gas, and a rectangular coordinate system with the volume percentage of the first gas as a horizontal axis variable and the volume percentage of the second gas as a vertical axis variable is constructed; Determining a target area in a rectangular coordinate system as a fault diagnosis space, wherein the target area is an isosceles right triangle, the origin of coordinates is a right-angle vertex of the isosceles right triangle, a right transverse half shaft is a first right-angle side, an upper longitudinal half shaft is a second right-angle side, and the lengths of the first right-angle side and the second right-angle side are 100; dividing the target area into a plurality of non-overlapping fault areas according to a fault classification rule, wherein each fault area corresponds to one fault type; taking the volume percentage of the first gas as an abscissa and the volume percentage of the second gas as an ordinate to obtain a target coordinate point; Determining a target fault type according to a fault area where the target coordinate point is located; And outputting the target fault type. In an alternative embodiment, the preset fault classification rules corresponding to different types of insulating oil filled power devices are different. In an alternative embodiment, the three kinds of characteristic gases include a first gas, a second gas and a third gas, and the normalizing process is performed on the volume concentration of the characteristic gases to obtain the volume percentage of each characteristic gas in the total characteristic gases, including: respectively carrying out normalization treatment on the volume concentrations of the first gas and the second gas to obtain the volume percentages of the first gas and the second gas in the total characteristic gas; the volume percentage of the third gas in the total characteristic gas is calculated based on the following formula: ; Wherein, the Represents the volume percent of the third gas in the total characteristic gas,Representing the volume percent of the first gas in the total characteristic gas,Representing the volume percent of t