High-precision measurement method for zero-sequence capacitance of EHV/UHV four-circuit transmission lines on the same tower

Abstract

The invention discloses a high precision method for measuring zero sequence capacitance of super / extra high voltage same-tower quadruple power transmission lines. The method comprises steps specifically: after power failure of the same-tower quadruple lines to be measured, three-phase short circuit of a head end of one line of the four lines is carried out, voltage enforcement is carried out, three-phase short circuit hanging of a tail end of the one line is carried out, and three-phase short circuit grounding processing on head ends and tail ends of other lines is respectively carried out; time synchronization technology of a global positioning system (GPS) is further utilized, data of zero sequence voltage and zero sequence current of the head ends and the tail ends of the quadruple lines is simultaneously acquired; and zero sequence self-capacitance and zero sequence mutual capacitance of the four power transmission lines can be acquired by utilizing a calculation method and a zero sequence capacitance correction coefficient provided by the invention. According to the method, a super / extra high voltage same-tower quadruple power transmission line model is established, the high precision method for measuring zero sequence capacitance of the super / extra high voltage same-tower quadruple power transmission lines is provided, and the method has important engineering application values.

Description

technical field [0001] The invention relates to a high-precision measurement method for the zero-sequence capacitance of a super / ultra-high voltage four-circuit transmission line on the same tower. Background technique [0002] At present, EHV / UHV transmission lines have the characteristics of high voltage level and long transmission distance, and there are multiple lines erected on the same tower. The equivalent error of using traditional line centralized parameters is relatively large, while the power flow calculation, relay The setting of the protection, the calculation of the short-circuit current and the selection of the system operation mode are all closely related to the line parameters, so the accuracy of the measurement of the transmission line parameters must be guaranteed. [0003] At present, there are many methods to calculate line parameters, and corresponding line measuring instruments have been developed. In short-distance transmission lines, such as the cap...

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Problems solved by technology

[0002] At present, EHV / UHV transmission lines have the characteristics of high voltage level and long transmission distance, and there are multiple lines erected on the same tower. The equivalent error of using traditional line centralized parameters is relatively large, while the power flow calculation, relay The setting of the protection, the calculation of the short-circuit current and the selection of the system operation mode are all closely related to the line parameters, so the accuracy of the transmission line parameter measurement must be guaranteed

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