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State evaluation method for power transformer based on fuzzy mathematics

A technology for power transformers and state assessment, which is applied in the fields of instrumentation, informatics, electrical digital data processing, etc., can solve the problems that the state assessment system cannot be accurately assessed, and achieve the effect of a reliable and accurate state assessment system.

Inactive Publication Date: 2017-01-04
STATE GRID CORP OF CHINA +2
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The present invention proposes a state evaluation method for power transformers based on fuzzy mathematics in order to solve the problem that the existing state evaluation system cannot accurately evaluate

Method used

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  • State evaluation method for power transformer based on fuzzy mathematics
  • State evaluation method for power transformer based on fuzzy mathematics
  • State evaluation method for power transformer based on fuzzy mathematics

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specific Embodiment approach 1

[0013] Specific implementation mode one: as figure 1 As shown, a power transformer state assessment method based on fuzzy mathematics includes the following steps:

[0014] The invention reflects various test items of oil-immersed power transformers of different voltage levels through analysis, and preprocesses the pressure test data of the transformer body and bushing and the oil test data of the body according to fuzzy mathematics. Find out the fault type according to the processing and analysis results, and make a comprehensive evaluation of the transformer status.

[0015] Step 1: Preprocessing the transformer body, bushing pressure test data and oil test data of the transformer body;

[0016] Step 2: Determine the membership function according to Step 1;

[0017] Step 3: Obtain the fault type of the power transformer according to Step 2;

[0018] Step 4: Comprehensive assessment of the state of the power transformer.

specific Embodiment approach 2

[0019] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the preprocessing of the transformer body, the bushing pressure test data and the oil test data of the transformer body in the step 1 includes the fuzzification of the electrical test data and Improved Fuzzy Comprehensive Processing of Dissolved Gas in Oil as Characteristic Quantities.

[0020] Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0021] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the fuzzification of the electrical test data includes the fuzzification of the high voltage test data of the power transformer and the fuzzification of the test data of the oil jacket withstand voltage. Quantitative analysis of fuzzy phenomena, fuzzy language and combinations of power transformers by mathematical methods.

[0022] Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention relates to a state evaluation method for a power transformer based on fuzzy mathematics. The state evaluation method for the power transformer based on fuzzy mathematics provided by the invention is used for solving the problem that the present state evaluation system cannot accurately evaluate. The method comprises the following steps: 1) preprocessing the transformer body, the casing pressure test data and the oil test data of transformer body; 2) confirming a membership function according to the step 1); 3) acquiring the fault type of the power transformer according to the step 2); 4) comprehensively evaluating the state of the power transformer. According to the invention, on the basis of the test requirement for the substation, a fuzzy mathematic theory is adopted for processing the high-pressure test data and oil test data of the transformer, the membership function of local test data is confirmed, the fault type is confirmed according to the processing and analyzing result and the transformer state is comprehensively evaluated. The state evaluation method is applied to the field of evaluation for the state of the power transformer.

Description

technical field [0001] The invention relates to a state evaluation method of a power transformer based on fuzzy mathematics. Background technique [0002] Power transformers are responsible for various functions such as power transmission, distribution and voltage conversion, and are one of the key components of power equipment. Power transformers provide multiple services for power systems. Whether the transformer is running well or not directly affects the safety and reliability of the power network. [0003] The condition assessment of power transformers is the basis of condition-based maintenance, and the effective assessment of the operating health status of power transformers is a research hotspot. The key to state evaluation is to establish a reasonable state index evaluation model based on non-destructive quantities obtained from preventive tests to judge the operating state of the transformer. Although research on condition assessment technology has been carried o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 陈洪涛吴刚单小东孟祥辰陈艳孙振胜张海明李伟李军韩显华李冬梅黄树春赵强李一凡韩兆婷
Owner STATE GRID CORP OF CHINA
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