Method for measuring inter-phase mutual capacitances of long-distance extra-high voltage double-circuit lines on same tower

Abstract

The invention discloses a method for measuring inter-phase mutual capacitances of long-distance extra-high voltage double-circuit lines on a same tower. The method is suitable for measuring the inter-phase mutual capacitances of the double power transmission lines on the same tower at the frequency of 50 Hz, wherein the distance between the power transmission lines is more than 240 kilometers, and the method is also suitable for measuring the inter-phase mutual capacitances of the short-distance lines. The method includes the steps that firstly, inter-phase mutual capacitance values at two frequencies are acquired, wherein up-down absolute error values of the two frequencies are equal with the frequency of 50Hz as the midpoint; the two inter-phase mutual capacitance values are added and then are divided by two, and then the inter-phase mutual capacitance mean value at the two frequencies is obtained, wherein the mean value is the inter-phase mutual capacitance at the frequency of 50 Hz. Compared with the prior art, the method has the following advantages that a traditional measurement method is changed, the influence of the lines on ground capacitances and interference of power frequency are taken into account in the wiring mode and algorithms, errors of the inter-phase capacitances measured through the method are reduced especially in the long-distance power transmission lines, and the engineering requirement is met.

Description

technical field [0001] The invention belongs to power transmission and transformation testing, and particularly relates to a method for measuring the mutual capacitance between phases of long-distance ultra-high voltage double-circuit lines on the same tower. The influence of mutual capacitance can realize accurate measurement of mutual capacitance between long-distance double-circuit lines on the same tower. Background technique [0002] For the measurement of mutual capacitance between long-distance UHV double-circuit transmission lines on the same tower, the traditional measurement method often produces large errors because the wiring method and algorithm do not consider the influence of the line to ground capacitance and the existence of power frequency interference. The longer the error is, the greater the error may be intolerable in engineering applications. Contents of the invention [0003] The purpose of the present invention is to propose a method for measuring ...

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Problems solved by technology

[0003] The purpose of the present invention is to propose a method for measuring the mutual capacitance between long-distance ultra-high voltage double-circuit lines on the same tower. The equation group algorithm overcomes the influence of the capacitance of the phase wires to the ground on the measurement of the mutual capacitance between the phases. This method is especially suitable for the measurement of the mutual capacitance between the long-distance lines and also suitable for the measurement of the mutual capacitance between the short-distance lines.

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