Insulation health state evaluation method of dry type transformer for coal mine underground power supply system

Abstract

The invention relates to an insulation health state evaluation method of a dry type transformer for a coal mine underground power supply system. According to the method, evaluation is carried out based on monitoring quantity determining, feature quantity extraction, feature quantity processing, fault diagnosis, health state evaluation, database establishment and state early warning-based multi-information source fusion; the development degree of an insulation local defect is monitored through using the change laws of related feature quantities in a discharge evolution process of the insulation defect; and diagnosis of the risk of the insulation local defect is realized based on a particle swarm optimization algorithm-based support vector machine, so that a comprehensive evaluation result of the overall health state and insulation local deterioration degree of the dry type transformer can be obtained. According to the method of the invention, corresponding variable weight values are assigned for the feature quantities, and therefore, high applicability and high judgment accuracy can be realized, early, accurate and quick prediction of potential faults and identification of fault types can be benefitted, the operating state and possible defect development trend of the transformer can be comprehensively evaluated, and the reliability and continuity of the operation of the transformer can be improved.

Description

technical field [0001] The invention relates to a method for evaluating the health state of a mine dry-type transformer, in particular to a method for evaluating the health state of a mine dry-type transformer based on multi-source information fusion, and belongs to the field of health state diagnosis of large mine power equipment. technical background [0002] As the power center of coal mine underground power supply system, mining dry-type transformer directly affects the reliability and continuity of underground power supply system. However, the underground environment is extremely harsh, and there are many complex and uncertain factors in the work site, resulting in more potential failures during the operation of the transformer, and the related failure rate has also increased significantly. A lot of practical experience shows that the failure of mine dry-type transformers has become one of the main causes of coal mine fire accidents and unplanned power outages, and its ...

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Problems solved by technology

In addition, mine dry-type transformers have been operating in the special environment of coal mines for a long time, so the evaluation method of oil-immersed transformers is not completely suitable for mine dry-type transformers.

At present, mine dry-type transformers operating underground in coal mines can only monitor the safety status of the underground environment or threshold alarm or threshold power failure. For the health status of the transformer, even after the accident, due to the lack of corresponding monitoring and recording means, it is impossible to fully grasp the various state parameters of the transformer before the fault, and it is impossible to quickly and accurately locate the location and cause of the accident

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