Comprehensive diagnosis method of oil-immersed transformer based on fault tree

An oil-immersed transformer, comprehensive diagnosis technology, applied to instruments, measuring electrical variables, measuring devices, etc., to ensure safe and stable operation

Active Publication Date: 2012-09-12
STATE GRID ELECTRIC POWER RES INST +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the traditional single diagnostic method of oil chromatography, use multiple diagnostic methods to comprehensively diagnose and improve the accuracy of fault diagnosis, and introduce top layer oil temperature, partial discharge, micro wa

Method used

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  • Comprehensive diagnosis method of oil-immersed transformer based on fault tree
  • Comprehensive diagnosis method of oil-immersed transformer based on fault tree
  • Comprehensive diagnosis method of oil-immersed transformer based on fault tree

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Experimental program
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Effect test

specific Embodiment

[0086] (1) First of all, the monitoring device of the type of dissolved gas in the oil, partial discharge, micro water, iron core ground current, top oil temperature, and winding fiber temperature monitoring in important parts of the transformer sends the acquired status information to the status connection through the bus. Enter the gateway machine, and analyze and store it in the corresponding database table.

[0087] (2) Use the sample to calculate the diagnostic accuracy of various fault diagnosis methods using the improved three-ratio method, IEC60599 method, improved electronic research method, no coding method and David triangle method to obtain an initial diagnosis

[0088] Table of correct rate of breaking method. As shown in Table 5:

[0089] Table 5 Correct rate of diagnosis method

[0090]

Fault 1

Fault 2

Fault 3

Fault 4

Fault 5

Fault 6

Fault 7

Fault 8

Diagnostic method 1

70％

86％

76％

72％

80％

-

80％

-

Diagnosis method 2

74％

79％

78％

75...

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Abstract

The invention discloses a comprehensive diagnosis method of an oil-immersed transformer based on a fault tree, which includes steps: (1) collecting correlated condition characteristic parameter values of gas dissolved in oil, moisture in oil, local discharge, iron core grounding current, top oil temperature and winding optical fiber temperature measurement of the transformer in real time, (2) normalizing by aid of diagnosed fault types of gas dissolved in oil, (3) counting fault diagnose accuracy of all diagnose methods, (4) obtaining state quantity of measured gas dissolved in oil for respective diagnose, (5) obtaining a fault confidence digit group, and (6) integrating to obtain a fault diagnose result of the transformer. The comprehensive diagnosis method combines advantages of various oil chromatographic diagnose methods, overcomes defects of a single diagnose method, adopts gas dissolved in oil as a diagnose core, is supplemented by fault tree diagnose, masters operation health conditions of the transformer macroscopically, can achieve fault positioning of devices, and has important practical meaning for finding potential hidden fault danger of devices and ensuring safe and stable operation of an electrical power system.

Description

Technical field [0001] The invention relates to the technical field of fault diagnosis of substation equipment, and specifically relates to a comprehensive diagnosis method of an oil-immersed transformer based on a fault tree. Background technique [0002] Power transformer is the hub of power grid transmission and the main equipment for grid operation. The reliability of its operation is a prerequisite for the safety and stability of the power system. With the increase of generating unit capacity and the increase of transmission voltage level, the The capacity and voltage level have also been correspondingly increased and increased, and higher requirements on the reliability of the transformer have also been put forward. Therefore, it is of great practical significance to discover potential faults early through online monitoring and fault diagnosis of transformers. [0003] Relatively mature online transformer monitoring technologies have been formed at home and abroad, such as p...

Claims

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Application Information

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IPC IPC(8): G01R31/00
Inventor 张声圳林峰李莉李盛盛
Owner STATE GRID ELECTRIC POWER RES INST
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