An early warning method for out-of-tolerance risks of capacitive voltage transformers

Abstract

The present invention provides an out-of-tolerance risk early warning method for a capacitive voltage transformer. The method includes: firstly, collecting historical transformer error estimated value data and transformer error long-term and short-term prediction values, and analyzing and obtaining the transformer error long-term and short-term prediction values reliability index. Then, according to the estimated value data of the historical transformer error, the stability index of the measurement error of the transformer is obtained. Finally, based on the reliability index of the long-term short-term error prediction value of the transformer and the stability index of the measurement error of the transformer, the fuzzy comprehensive evaluation method is used to evaluate the out-of-tolerance risk of the transformer. By collecting the estimated value data of historical transformer errors and the long-term and short-term prediction values ​​of transformer errors, the reliability index of long-term and short-term prediction values ​​of transformer errors and the stability index of measurement errors of transformers are obtained through analysis, and based on this, the fuzzy comprehensive evaluation method is used to realize Future risk prediction and early warning for transformers.

Description

technical field [0001] The invention relates to the technical field of on-line monitoring of electric power metering, in particular to an early warning method for an out-of-tolerance risk of a capacitive voltage transformer. Background technique [0002] As an important part of the electric energy metering device, the accuracy and reliability of the metering performance of the transformer is directly related to the fairness and justice of the electric energy trade settlement. A capacitive voltage transformer (Capacitance type Voltage Transformer, CVT) is divided by series capacitors, and then stepped down and isolated by an electromagnetic transformer. As an instrument for transforming voltage, a capacitive voltage transformer can also couple the carrier frequency To the transmission line for long-distance communication, selective line high-frequency protection, remote control and other functions. Compared with conventional electromagnetic voltage transformers, capacitive v...

AI Technical Summary

Problems solved by technology

The existing technology analyzes the risk of the transformer evaluation system, but there is only a single risk index predicted by the BP artificial neural network algorithm, which cannot fully and accurately realize the risk prediction

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