Post insulator contamination degree recognition method

Abstract

The invention discloses a post insulator contamination degree recognition method. The post insulator contamination degree recognition method comprises the following steps of 1 periodically monitoring and storing a leakage current amplitude of a post insulator and temperature, humidity and rainfall of an environment; 2 selecting multiple leakage current amplitude data and multiple environment humidity data in an effective time period, substituting the data into a model formula (shown in the description) and obtaining a first characteristic coefficient a and a second characteristic coefficient b through model formula fitting, wherein Im represents the leakage current amplitude, RH represents environment humidity, the first characteristic coefficient a is greater than 0, and the second characteristic coefficient b is greater than 0; 3 substituting the second characteristic coefficient b into a pre-equivalent salt deposit density prediction model and a contamination degree prediction model to obtain the equivalent salt deposit density and the contamination degree of the surface of the insulator corresponding to the second characteristic coefficient b. By means of the post insulator contamination degree recognition method, accuracy is high, a monitoring device is simple, real-time online monitoring can be achieved, reduction of power system working amount is facilitated, and contamination flashover risk is reduced.

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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