Method for jointly evaluating insulation state of oil paper by using multiple statistical parameters

An oil-paper insulation and parameter technology, which is applied in the direction of testing dielectric strength, etc., can solve the problems such as the lack of a clear and effective method for diagnosing the oil-paper insulation state and the remaining life of the oil-paper insulation without the degree of aging.

Active Publication Date: 2011-09-21
STATE GRID HUBEI ELECTRIC POWER RES INST +1
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Problems solved by technology

[0008] (1) At present, there is no ideal method for judging the degree of aging and evaluating the remaining life of oil...

Method used

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  • Method for jointly evaluating insulation state of oil paper by using multiple statistical parameters
  • Method for jointly evaluating insulation state of oil paper by using multiple statistical parameters
  • Method for jointly evaluating insulation state of oil paper by using multiple statistical parameters

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Embodiment Construction

[0062] The specific implementation of the present invention is: through the ultra-wideband partial discharge detection system commonly used in the industry, online partial discharge measurement is carried out on oil-paper insulated power equipment, and seven main statistical parameters of insulating oil-paper partial discharge are obtained: NpSEC, Qmax, Hn_mean, alfa, beta, Hn_Sk, Hqn_Kur; continuously monitor the statistical parameters of partial discharge of oil-paper insulation of power equipment, if it is found that NpSEC, Hn_Sk show a monotonous increasing trend within a period of time, and Qmax, Hn_mean, alfa, beta and Hqn_Kur show a monotonous trend If the trend of decreasing changes, it can be judged that the oil-paper insulation is continuously aging due to the effect of partial discharge; accordingly, the state of the oil-paper insulation is jointly evaluated by multiple statistical parameters.

[0063] In order to prove the viewpoint proposed by the present invention...

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Abstract

The invention relates to a method for jointly evaluating the insulation state of oil paper by using multiple statistical parameters, characterized by comprising the following steps of: using an ultra-wideband partial discharge detection system to perform partial discharge detection on the oil paper insulation in a power device; collecting and extracting the partial discharge statistical parameters of the oil paper insulation; by analyzing the change trends of seven statistical parameters, evaluating the insulation state of the oil paper insulation in the power device; and if NpSEC and Hn_Sk present a monotone increasing trend and the alfa, beta, Qmax, Hn_mean and Hqn_Kur present a monotone decreasing trend, judging that the oil paper insulation in the power device is in a deterioration state. The method can be used for forecasting the hazard degree of the partial discharge before the insulation has fault. The method can be used for preventing the insulation fault and reducing the fault possibility of the power device caused by insulation fault, has high accuracy and low dispersivity, is convenient to realize, and does not influence running of the power device.

Description

technical field [0001] The invention relates to a technology for evaluating the state of electric equipment, in particular to a method for evaluating the state of oil-paper insulation. Background technique [0002] Under the current background of my country's rapid economic development, the whole society has higher and higher requirements for power reliability. Correspondingly, the power system puts forward higher and higher requirements for the safe and reliable operation of power equipment, especially large-scale power equipment. The transition of power system operation and maintenance mode from planned maintenance mode to condition-based maintenance has become an inevitable trend. [0003] At present, a large number of power equipment adopts oil-paper insulation structure, especially the power transformer, as one of the most expensive and most critical pivotal equipment in the power system, its operation status is directly related to the safe operation of the system. Its ...

Claims

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Application Information

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IPC IPC(8): G01R31/12
Inventor 沈煜谢齐家阮羚邓万婷
Owner STATE GRID HUBEI ELECTRIC POWER RES INST
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