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Method for evaluating oil paper insulation ageing state based on local discharge characteristic parameter

A partial discharge and characteristic parameter technology, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve problems such as unobtained aging status, and achieve the effect of realizing online accurate evaluation and simplifying the evaluation model

Inactive Publication Date: 2009-04-15
CHONGQING UNIV
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Problems solved by technology

The existing methods for evaluating the aging state of oil-paper insulation based on partial discharge, no matter from the perspective of time-domain waveform characteristics or spectrum characteristics, have not obtained a method that can reliably evaluate its aging state

Method used

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  • Method for evaluating oil paper insulation ageing state based on local discharge characteristic parameter
  • Method for evaluating oil paper insulation ageing state based on local discharge characteristic parameter
  • Method for evaluating oil paper insulation ageing state based on local discharge characteristic parameter

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Embodiment Construction

[0031] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0032] Connect the input end of the partial discharge signal sensor to the oil-paper insulated electrode of the power transformer as an aging sample, and connect the output end to the data processing device, so that the partial discharge signal of the oil-paper insulation can be obtained and transmitted to the data processing device; the partial discharge signal sensor can be The Rogowski coil is selected, the partial discharge signal is collected by the traditional pulse current method, and the data processing device can be an intelligent oscilloscope.

[0033] see figure 1 , the method for evaluating the aging state of oil-paper insulation based on partial discharge characteristic parameters in this embodiment includes the following steps:

[0034] 1) The partial discharge signal sensor collects the partial discharge signal of the oil...

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Abstract

The invention provides a new method for evaluating the state of paper oil insulation ageing and realizes the on-line evaluation of the paper oil insulation ageing state of a power transformer. The method includes the following steps: 1) a local discharge signal transducer acquires a local discharge signal of paper oil insulation and transmitted the signal to a data processing device; 2) the processing device analyzes the local discharge signal, obtaining the local discharge feature parameter; 3) the processing device extracts main constituent factor from the local discharge feature parameter; 4) the processing device utilizes the main constituent factor obtained in step 3) and constructs a paper oil insulation ageing evaluation model through an artificial neural net to gain the ageing state of paper oil insulation. By implementing data analysis for the local discharge signal in the paper oil insulation ageing process, the invention extracts the local discharge feature parameter capable of reflecting the insulation ageing, conducts further data mining on the parameter and on the basis, constructs a reasonable mathematics model to evaluate the ageing state of paper oil insulation.

Description

technical field [0001] The invention belongs to the field of insulation aging and life prediction of electric equipment, and in particular relates to an evaluation method for the oil-paper insulation aging state of an oil-immersed power transformer. Background technique [0002] The power transformer is the core of electric energy conversion and transmission, and is the most important and critical equipment in the power grid. Currently, a significant portion of transformers in the power industry around the world have reached the end of their design life. Transformer aging assessment and life prediction technology has been concerned by many scholars at home and abroad. The main form of the internal insulation of large-capacity power transformers is the insulating oil-fiber paper composite insulation system, which gradually ages due to multiple factors such as electricity, heat, and machinery during operation, and is attacked by external factors such as lightning and system s...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01R31/12
Inventor 廖瑞金杨丽君周湶李剑杜林陈伟根张晓星孙才新汪可周天春
Owner CHONGQING UNIV
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