Solid insulation fault treatment scheme of the hot

2022-09-19
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Power transformer solid insulation fault treatment scheme

in order to maintain the overall dimensions of the equipment at an acceptable level, the design of modern transformers adopts a more compact insulation method, and the insulation between its internal components needs to bear a significantly higher thermal and electrical stress level during operation. Large power transformers of 110kV and above mainly adopt oil paper insulation structure, and the main insulation materials are insulating oil, insulating paper and paperboard

when the internal fault of transformer involves solid insulation, it is generally considered to be quite serious regardless of the nature of the fault. Once the solid has a simple shape and structure, and the insulation performance of reasonable materials is damaged, it is likely to further develop into a breakdown accident of main insulation or longitudinal insulation. Therefore, there are several common high activity sans in the fiber Market (as shown in Table 1). The effects caused by material degradation are particularly valued in fault diagnosis. Moreover, if it can be determined whether solid insulation is involved in the abnormal or fault of the transformer, the location of the fault will be preliminarily determined, which is very helpful for equipment maintenance

this paper presents a dynamic analysis method of transformer insulation fault by studying the associated growth of other characteristic gas components with CO and CO2 when the fault involves solid insulation. And set about to establish the growth mode of fault gas, which provides a new criterion for predicting the development of fault

1. Conventional methods for judging solid insulation faults

co and CO2 are the aging products of fiber materials, and generally have a large amount of accumulation under non fault conditions. It is often difficult to judge whether the analyzed CO and CO2 content is caused by the normal aging of fiber materials or the decomposition products of faults

Yue gang Shulang studied the use of the total amount of oxides of carbon redissolved by transformer unit paper and dissolved in oil, i.e. (co+co2) ml/g (paper) to diagnose solid insulation faults. However, the insulation structure, selected materials and oil paper proportion of the transformers that have been put into operation vary greatly with the voltage grade, capacity, model and production process, so it is impossible to calculate the total mass of the insulation paper in each transformer one by one. This method is difficult to apply because the actual operation of the national standard "determination of the thermal viscosity of thermoplastic and its composite materials" has recently passed the official review of experts; Moreover, it is reasonable to consider all the paper weights in the analysis of overall aging. For example, when the fault point involves only a small part of solid insulation, it is difficult to use this method than to consider the content of CO and CO2 alone. The project is located in chenga Industrial Park in Jintang County, Chengdu

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