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A method for accurate measurement of zero-sequence parameters of double-circuit non-full-line parallel transmission lines

A technology for transmission lines and zero sequence parameters, which is applied to measuring devices, measuring electrical variables, measuring current/voltage, etc., and can solve problems such as the inability to use long-distance transmission lines.

Active Publication Date: 2021-09-03
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method based on the centralized parameter model cannot be applied to long-distance transmission lines, while the method based on the distributed parameter model is currently only applicable to parallel lines on the same tower

Method used

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  • A method for accurate measurement of zero-sequence parameters of double-circuit non-full-line parallel transmission lines
  • A method for accurate measurement of zero-sequence parameters of double-circuit non-full-line parallel transmission lines
  • A method for accurate measurement of zero-sequence parameters of double-circuit non-full-line parallel transmission lines

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Embodiment Construction

[0129] In order to facilitate those of ordinary skill in the art to understand and implement the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the implementation examples described here are only used to illustrate and explain the present invention, and are not intended to limit this invention.

[0130] Combine below Figure 1 to Figure 4 The specific embodiment of the present invention is an accurate measurement method for zero-sequence parameters of a double-circuit non-full-line parallel transmission line, which includes the following steps:

[0131] Step 1: Define the length of each part of the first transmission line and the length of each part of the second transmission line, the first transmission line and the second transmission line are non-full-line parallel transmission lines;

[0132] The first power transmission line and the second power...

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Abstract

The invention discloses a method for accurately measuring zero-sequence parameters of a double-circuit non-full-line parallel transmission line. The invention uses GPS technology to synchronously measure the zero-sequence voltage and zero-sequence current at the first and last ends of the line under different measurement modes. According to the double-circuit non-full-line parallel transmission line model, the transmission matrix of the line is obtained, and then the zero-sequence resistance, zero-sequence inductance, and zero-sequence capacitance of the line to be tested are obtained according to the blackout measurement method or live measurement method and calculation method provided by the present invention. zero sequence parameters. The method of the invention is applicable to any common double-circuit line, has high measurement accuracy and can meet the actual needs of engineering.

Description

technical field [0001] The invention relates to a method for accurately measuring the zero-sequence parameters of a transmission line, in particular to a method for accurately measuring the zero-sequence parameters of a double-circuit non-full-line parallel transmission line. Background technique [0002] Transmission line is an important part of the power system and plays an important role in the transmission of electric energy. The accuracy of transmission line parameters plays an extremely important role in the safe and stable operation of the power grid, especially the setting of relay protection devices and fault location. [0003] With the rapid development of the power industry, the network architecture of the power system is becoming more and more complex. Due to the limitation of geographical environment or the influence of power demand, multiple erection methods of double-circuit transmission lines have been derived. Since there is only partial coupling on the lin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/04G01R19/28
CPCG01R19/28G01R27/04
Inventor 胡志坚高明鑫倪识远陈锦鹏林铭蓉
Owner WUHAN UNIV
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