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

A dry-type transformer and state-of-health technology, applied in transformer testing, measuring electrical variables, instruments, etc., can solve the problem of low reliability of diagnosis results, inability to fully grasp various state parameters of transformers, and inconsistency in oil-immersed transformer evaluation methods. Fully applicable to problems such as mine dry-type transformers

Active Publication Date: 2016-12-07
TAIYUAN UNIV OF TECH
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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

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

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[0024] The specific implementation of the present invention will be further described below.

[0025] Implement the above-mentioned method for evaluating the insulation health of dry-type transformers for underground coal mine power supply systems provided by the present invention. The evaluation method is to monitor multiple parameters online, extract characteristic values ​​from the monitored quantities, and determine each evaluation parameter using the analytic hierarchy process At the same time, the variable weight theory of the equilibrium function is introduced to realize the correction of the weight of each evaluation parameter, and the fuzzy theory is used to determine the membership function of the relative degradation degree of each evaluation parameter to the operating state of the dry-type transformer. Overall assessment of the operating status of the transformer. By studying the variation law of partial discharge at local insulation defects, the corresponding charact...

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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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Application Information

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IPC IPC(8): G01R31/02G01R31/12
CPCG01R31/1227G01R31/62
Inventor 温敏敏李璐朱晶晶田慕琴宋建成张莎
Owner TAIYUAN UNIV OF TECH
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