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Cloud-theory-based power transformer insulation state evaluation method

A technology for power transformers and insulation status, which is applied in the field of power transformer insulation status assessment based on cloud theory, and can solve problems such as difficult transformer assessment.

Inactive Publication Date: 2019-03-19
GUANGXI POWER GRID CO LTD NANNING POWER SUPPLY BUREAU
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The above researches only pass a single factor to evaluate the state of the transformer, and it is difficult to make an accurate evaluation of the transformer with a complex fault mechanism.

Method used

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  • Cloud-theory-based power transformer insulation state evaluation method
  • Cloud-theory-based power transformer insulation state evaluation method
  • Cloud-theory-based power transformer insulation state evaluation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0077] For a 220kV power transformer in a substation, the test data records are shown in Table 3 and Table 4. The operation and maintenance records of the transformer are: there is oil leakage, and it has undergone a periodical overhaul.

[0078] Table 3 oil chromatographic analysis data (×10 -6 )

[0079]

[0080] Table 4 preventive test data

[0081]

[0082] According to Table 1 and related data, the relative gas production rate of total hydrocarbons and the absolute gas production rate of CO can be calculated. The constant weight value of the index shown in the original oil chromatographic analysis is w (1) =[0.495 3, 0.139 1, 0.223 0, 0.142 6], w is obtained by changing the weight 1 =[0.575 0, 0.161 5, 0.258 9, 0.004 6]. Similarly, according to the electrical test and transformer oil test data in Table 1 and Table 2, the variable weights of the indicators calculated by the variable weight formula are respectively w 2 =[0.125 0, 0.099 5, 0.155 0, 0.477 1, 0.1433...

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Abstract

The invention discloses a cloud-theory-based power transformer insulation state evaluation method and belongs to the technical field of power transformer fault diagnosis. According to the method, an insulation state index system of a transformer is established, and a cloud-model-based insulation state evaluation method is provided for judging the fault type of the transformer according to the definition of the relative deterioration degree on the basis of grade division of the insulation state and the dynamic adjustment of index weights. By constructing a membership cloud model, the subjectivity and randomness of artificial determination of a membership function are reduced, and a reliability criterion is introduced to determine the insulation state of the transformer, so that a corresponding state maintenance strategy is obtained.

Description

technical field [0001] The invention belongs to the technical field of electrical equipment fault diagnosis methods, and in particular relates to a method for evaluating the insulation state of a power transformer based on cloud theory. Background technique [0002] The power transformer is one of the most important electrical equipment in the power system, and its operating status directly affects the safety level of the system. Therefore, how to improve the reliability of transformer operation has always been an important issue in transformer operation detection. At present, insulation failure has become one of the main causes of transformer failure. Therefore, it is of great significance to ensure the stable operation of the power grid to correctly evaluate the insulation state of the transformer, accurately find the fault defect of the transformer, and repair the transformer in time. Domestic research on transformer state evaluation points out that state evaluation is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
CPCG01R31/12
Inventor 唐小峰苏郑予希崔林丽陈芃何金梅
Owner GUANGXI POWER GRID CO LTD NANNING POWER SUPPLY BUREAU
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