A Method for Pollution Identification of Post Insulators

Abstract

The invention discloses a method for identifying the pollution degree of post insulators, which comprises the following steps: step 1, periodically monitoring the leakage current amplitude of post insulators, ambient temperature, humidity and rainfall, and storing them; step 2, selecting the effective time period Multiple leakage current amplitude data and multiple environmental humidity data are substituted into the model formula: Obtain the first characteristic coefficient a and the second characteristic coefficient by model formula fitting, wherein, I m is the amplitude of the leakage current, RH is the ambient humidity, the first characteristic parameter a > 0, and the second characteristic coefficient b > 0; step 3, the second characteristic coefficient b is substituted into the pre-equivalent salt density prediction model and The pollution degree prediction model obtains the equivalent salt density and pollution degree level of the insulator surface corresponding to the second characteristic coefficient b. The implementation of the present invention has the advantages of high accuracy, simple monitoring equipment, and real-time online monitoring, which is conducive to reducing the workload of the power system and reducing the risk of pollution flashover.

Description

technical field [0001] The invention belongs to the technical field of on-line monitoring of polluted external insulation of substations. In particular, it relates to a method for identifying the pollution degree of post insulators. Background technique [0002] Since the post insulators are operated in the outdoor environment for a long time, they are easy to accumulate pollution and be affected by moisture, resulting in frequent failures such as insulation strength reduction and pollution flashover. In order to ensure reliable power supply, frequent power outages for cleaning are not allowed. In the prior art, in order to effectively prevent pollution flashover accidents, it is necessary to make timely and accurate judgments on the pollution status of insulators through online monitoring means, so as to clean up in time before the danger comes. [0003] So far, leakage current detection is the most suitable method for on-line monitoring. However, in addition to being af...

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Problems solved by technology

[0002] Since post insulators have been operated in the outdoor environment for a long time, they are easy to accumulate pollution and be affected by moisture, resulting in frequent failures such as insulation strength reduction and pollution flashover

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