A method for measuring mutual capacitance between phases of long-distance UHV double-circuit lines on the same tower

Abstract

The invention discloses a method for measuring the mutual capacitance between phases of a long-distance ultra-high voltage double-circuit line on the same tower, which is a method for measuring the mutual capacitance between phases of a double-circuit transmission line on the same tower over two hundred and forty kilometers at a frequency of 50 Hz, and is also applicable to short-distance lines To measure the mutual capacitance between phases, the first step: obtain the mutual capacitance value between the two frequencies with the upper and lower absolute error values ​​equal to the 50Hz frequency as the midpoint; the second step: add the two mutual capacitance values ​​between the phases and divide by two, The average value of the mutual capacitance between phases at two frequencies is obtained, and the average value is the mutual capacitance between phases at a frequency of 50 Hz. Compared with the prior art, the present invention has the following advantages: the present invention changes the traditional measurement method, and considers the influence of the line to ground capacitance and the existence of power frequency interference in the wiring mode and algorithm, especially in long-distance transmission lines, using The phase-to-phase capacitance measured by the method of the invention reduces errors and satisfies engineering needs.

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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