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

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...

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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 water, iron core ground current and winding optical fiber temperature measurement at the same time Evaluate the health status of the transformer by monitoring the amount of monitoring to determine the scope of the fault, and dig out the relevant fault rules to provide a planning basis for condition-based maintenance

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