Error evaluation method and system for non-stationary output voltage transformer

Abstract

The invention discloses an error evaluation method and system for a non-stationary output voltage transformer. The method comprises the following steps: representing an evaluation parameter of an error state of the voltage transformer through employing a differential process under a non-stationary output condition; evaluating the evaluation parameters of the error state of the voltage transformerin real time in combination with a high-dimensional random matrix and an M-P law, and evaluating the error state of the voltage transformer, wherein the error state comprises an error normal state andan error abnormal state; and if the voltage transformer is in the error abnormal state, judging the error polarity of the voltage transformer in the error abnormal state based on the correlation between in-phase voltage signals. Real-time evaluation of the error state and the error polarity can be realized only according to the non-stable output data of the voltage transformer, so that the evaluation cost can be greatly reduced, and the operation and maintenance level of the voltage transformer can be enhanced. Compared with a circular ring law, the M-P law adopted in the high-dimensional random matrix has the following advantages: the eigenvalue distribution is easier to solve, and the evaluation index sensitivity is higher.

Description

technical field [0001] The invention belongs to the field of state evaluation and fault diagnosis of power transmission and distribution equipment, and more specifically relates to an error evaluation method and system for a voltage transformer with non-stationary output. Background technique [0002] Voltage transformer is a voltage measurement device widely used in substations, mainly including electromagnetic voltage transformer (PT), capacitive voltage transformer (CVT), electronic voltage transformer (EVT) using the principle of voltage division and based on The optical voltage transformer (OVT) based on the optical effect principle is the data starting point for relay protection and electric energy measurement and trade settlement. Its measurement accuracy is related to the safety, stability and economic operation of the entire power grid. [0003] According to the verification regulations of power transformers, voltage transformers must periodically detect errors to e...

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Problems solved by technology

[0006] Aiming at the defects of the prior art, the purpose of the present invention is to solve the technical problems that the existing high-dimensional random matrix error state evaluation method requires a smooth output, the reliability of the evaluation index is low, and the error polarity cannot be judged

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