Transformer operating state comprehensive evaluation method based on on-line monitoring

A technology for operating status and comprehensive evaluation, applied in instruments, special data processing applications, electrical digital data processing, etc., can solve problems such as affecting the accuracy of judgment and early warning, difficult to obtain in real time, and difficult to obtain complete relevant data.

Active Publication Date: 2014-03-26
上海迈内能源科技有限公司
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  • Summary
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  • Application Information

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Problems solved by technology

Aiming at the requirements of transformer state assessment, many studies have proposed a variety of transformer state assessment methods, but most of the existing methods are based on the single index of dissolved gas in transformer oil to evaluate the state of transformers
There are some comprehensive analysis and evaluation methods that apply data such as preventive tests, routine inspections, and status monitoring for ana

Method used

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  • Transformer operating state comprehensive evaluation method based on on-line monitoring
  • Transformer operating state comprehensive evaluation method based on on-line monitoring
  • Transformer operating state comprehensive evaluation method based on on-line monitoring

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0130] Example 1: A certain type of power transformer is SFP7-120000 / 220, the online monitoring data in 2009: the gas content in the oil (unit μL / L) is H 2 =57.0×10 -6 ,C 2 h 2 =0.4×10 -6 ,CH 4 =28.0×10 -6 ,C 2 h 4 =23.6×10 -6 ,C 2 h 6 =9.1×10 -6 , the calculated absolute gas production rate of total hydrocarbons is 3.7mL / d, the relative gas production rate of total hydrocarbons is 2.2%, and the absolute gas production rate of CO is 31.2mL / d; the measured water content in oil is 16.6mg / L. The dielectric loss is 0.37%, the partial discharge is 142pC, and the core grounding current is 31mA. The winding temperature is 109°C, and the on-load tap-changer is in good working condition.

[0131] Firstly, the compound whitening fuzzy gray element corresponding to each state level is constructed by constructing the transformer state evaluation single factor index.

[0132] For the measurement value of each single factor index above, according to the formula (7) and the refe...

Embodiment 2

[0144] Example 2: A certain model is SFPSZ1-240000 / 220 power transformer, online monitoring data in 2009: gas content in oil (unit μL / L) is H 2 =92.1×10 -6 ,C 2 h 2 =11.2×10 -6 ,CH 4 =20.8×10 -6 ,C 2 h 4 =61.7×10 -6 ,C 2 h 6 =7.9×10 -6 According to calculation, the absolute gas production rate of total hydrocarbons is 8.1mL / d, the relative gas production rate of total hydrocarbons is 6.2%, and the absolute gas production rate of CO is 63.7L / d; the micro-water content is 22mg / L, and the dielectric loss of capacitance type casing is 0.42% , The partial discharge is 292pC, the core grounding current is 86mA, the winding temperature is 121°C, the on-load tap-changer contacts have carbonized film and creepage traces, and there are abnormal sounds during operation. Similarly, follow the steps in Example 1 to construct the complex whitening fuzzy gray elements corresponding to each state level of the transformer state evaluation single factor index.

[0145] ...

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Abstract

A transformer operating state comprehensive evaluation method based on on-line monitoring comprises the following steps that monitoring various state indexes of a transformer in an on-line mode and conducting quantitative processing; determining the weights of evaluation indexes by combining improved analytic hierarchy process and grey correlation analysis; evaluating the state of the transformer. According to the transformer operating state comprehensive evaluation method based on on-line monitoring, the state of the transformer is combined to evaluate correlation function operation and membership degree process of the indexes, a transformer state comprehensive evaluation model based on combination of combination weighting approach and a fuzzy grey element is established, various on-line detecting state information quantities can be synchronized, the operation state of the transformer can be effectively and accurately judged in a comprehensive mode, an evaluation result is intuitive, and the method is used for instructing practical overhaul arrangement work of the transformer.

Description

technical field [0001] The invention belongs to the technical field of high voltage and insulation, and in particular relates to a method for evaluating the state of power transformer operation based on online monitoring of transformer operation parameters. Background technique [0002] As the key equipment of the power system, the power transformer's operation safety and reliability are directly related to the safety and stability of the power system. For a long time, most of the judgments on the operation status of transformers at home and abroad are based on power failure preventive tests and regular maintenance, and are evaluated according to relevant standards and operating experience. However, in practice, only static evaluation cannot guarantee the safe and reliable operation of transformers. Therefore, it is an inevitable trend to judge the state of the transformer through advanced state online monitoring means and implement the state-of-the-art maintenance of power ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 盛戈皞刘亚东宋辉钱勇胡岳江秀臣
Owner 上海迈内能源科技有限公司
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