Fault heat source detection method for valve side bushing of extra-high voltage converter transformer

Abstract

The invention discloses a fault heat source detection method for a valve side bushing of an extra-high voltage converter transformer, and the method comprises the steps: describing the internal defects of the valve side bushing of the extra-high voltage converter transformer through employing two physical geometric concepts: surface defects and body defects, wherein the defects of the extra-high voltage converter transformer valve side sleeve caused by the working conditions of metal particle mixing, bubble mixing, cracks in the pouring link and capacitive screen breakdown are summarized and approximated from thermal and geometric properties. The method comprises the following steps: by taking valve side sleeves with surface defects and body defects of different sizes as samples, calculating defect fault heat source intensity through surface heat flux obtained by actual measurement of a heat flow sensor through a valve side sleeve internal defect heat source equivalent model; and forming corresponding curve data of detailed defect faults and heating conditions, namely heat source intensity, providing data support for effectively preventing casing pipe faults, and therefore accurate fault heat source detection is achieved.

Description

technical field [0001] The invention relates to the field of UHV fault detection, in particular to a method for detecting a heat source of a UHV converter transformer valve-side casing fault heat source. Background technique [0002] The bushing on the valve side of the converter transformer is the core component of the converter transformer. Its function is to lead the lead wires of the inner winding of the transformer to the outside of the oil tank to realize the connection with the external power grid. An important "bridge" with the valve hall of the converter station. [0003] With the continuous growth of electricity load, the complex operating environment of long distance, high voltage and large capacity puts forward higher requirements for the stable operation of bushings. In recent years, the proportion of transformer outage accidents caused by bushing failures is still relatively high. In the report "Analysis of State Grid Corporation's Operation Situation 2003-201...

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Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, the invention provides a method for detecting the fault heat source of the UHV converter transformer valve-side bushing, which solves the problem of how to accurately detect the fault heat source of the internal defect of the UHV converter transformer valve-side bushing

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