A Calculation Method of Stray Capacitance of Capacitive Voltage Transformer

Abstract

The invention discloses a capacitance voltage transformer stray capacitance calculation method. According to the method, a capacitive voltage divider is divided into a plurality of units; the potential coefficient matrix of the capacitive voltage divider is obtained by using a charge simulation method; and the inverse matrix of the potential coefficient matrix of the capacitive voltage divider is further calculated, so that the capacitance coefficient matrix of the capacitive voltage divider can be obtained; the stray capacitance to earth and stray capacitance to high-voltage end of the capacitive voltage divider at different heights can be obtained; and thus, the stray capacitance of the capacitive voltage divider can be known accurately, influence on the measurement accuracy of a capacitive voltage transformer which is caused by a condition that the stray capacitance of a capacitive voltage divider is adopted as a constant numerical value at present can be eliminated. The method has the advantages of simple principle and convenient calculation.

Description

technical field [0001] The invention relates to the technical field of power equipment operation status monitoring, in particular to a method for calculating the stray capacitance of a capacitive voltage transformer. Background technique [0002] With the continuous improvement of the voltage level of the power system, the capacitive voltage transformer is used more and more widely in the power system as an important equipment for monitoring and metering in the power grid. The accuracy of its measurement is of great importance to the safe, reliable and economical operation of the power system. Tremendous influence. The capacitive voltage transformer is mainly composed of a capacitive voltage divider and a medium-voltage transformer. Due to the stray capacitance of the capacitive voltage divider, its own voltage distribution will be uneven, which will affect the output voltage of the medium-voltage arm, and then affect the capacitive voltage. The measurement accuracy of the ...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to calculate the stray capacitance to the ground and the stray capacitance to the high voltage end at different heights of the capacitive voltage divider. The problem that the stray capacitance of the capacitive voltage divider is taken as a fixed value affects the measurement accuracy of the capacitive voltage transformer

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