A Method for Evaluating the Operating State of a Capacitive Voltage Transformer

Abstract

The invention relates to an operating state assessment method of a capacitor voltage transformer. Data collection of an operating state of the capacitor voltage transformer is performed; collected data are classified and processed and taken as bases for assessing the operating state of the capacitor voltage transformer; the operating state of the capacitor voltage transformer is assessed, and a comprehensive state quantity assessment system of the capacitor voltage transformer is built with an correlation analysis method; the operating state of the capacitor voltage transformer is graded with a single state quantity score calculation method and a capacitor voltage transformer overall score calculation method; constant weight coefficients of each single state quantity and each comprehensive state quantity are provided; and variable weight coefficients of all comprehensive state quantities are calculated; the overall score of the capacitor voltage transformer is calculated according to scores and the variable weight coefficients of all comprehensive state quantities; and then the operating state of the capacitor voltage transformer is judged according to the overall score situation of the capacitor voltage transformer.

Description

technical field [0001] The invention belongs to the technical field of power transmission and transformation equipment, in particular to a method for evaluating the running state of a capacitive voltage transformer. Background technique [0002] The voltage transformer is one of the key equipment in the power system. Improving the operation reliability of the voltage transformer is of great significance to the safe and reliable operation of the entire power grid and to reduce the operating cost of the power grid. In order to improve the maintenance and repair level of the voltage transformer during its operation, it is necessary to scientifically evaluate the operation status of the voltage transformer. In recent years, with the in-depth study of the condition-based maintenance theory, more and more attention has been paid to the condition assessment technology, and the condition assessment methods related to capacitive voltage transformers and coupling capacitors have led t...

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Problems solved by technology

However, the applicant found through research that most of the evaluation methods are focused on the research of method theory, ignoring the analysis of the correlation of each state quantity reflecting the operation state of the capacitor voltage transformer, especially not paying attention to the relationship between various information Intrinsic connection among them, and it is easier to add personal subjective opinions in the process of determining the weight coefficients, thus affecting the accuracy of the final evaluation results

Secondly, the applicant also found that due to the complexity of the failure process of the capacitor voltage transformer, a comprehensive analysis of the measured data reflecting the relationship between the potential defects of the capacitor voltage transformer and its failure probability needs to be carried out, but the existing technology does not have this aspect give the necessary attention

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