Test methods of mutual impedance and coupling capacitance of transmission lines in parallel

A technology of transmission lines and testing methods, applied in the field of different frequency incremental methods, can solve problems such as wide power outages and strong interference, and achieve the effect of improving detection efficiency and accuracy

Active Publication Date: 2012-08-01
EAST CHINA ELECTRIC POWER TEST & RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the parametric test of parallel transmission lines, especially the coupling parameter test between multiple parallel transmission lines, involves a wide range of outages and strong interference, so it is almost impossible to implement in actual testing

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  • Test methods of mutual impedance and coupling capacitance of transmission lines in parallel
  • Test methods of mutual impedance and coupling capacitance of transmission lines in parallel
  • Test methods of mutual impedance and coupling capacitance of transmission lines in parallel

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Embodiment Construction

[0021] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below taking a double-circuit transmission line as an example.

[0022] In the test method of the present invention, the parallel double-circuit transmission line includes a test line and an operating line, wherein the test line includes a phase A test line, a B phase test line and a C phase test line, and the operating line includes an A phase operating line, a B phase Running line and Phase C running line. The A-phase test line corresponds to the A-phase operating line, the B-phase test line corresponds to the B-phase operating line, and the C-phase test line corresponds to the C-phase operating line.

[0023] Taking the mutual impedance test between the B-phase test line and the B-phase operating line in the double-circuit transmission line as an example, the method for testing the mutual impedance of the parallel...

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Abstract

The invention relates to test methods of mutual impedance and coupling capacitance of transmission lines in parallel. The test method of mutual impedance comprises the following steps that: a head end of one phase test line in a test line accesses a pilot frequency testing voltage and the end of the phase test line is grounded; the head end voltage, the head end current and the end current of the phase test line are tested and a voltage power frequency component and a current pilot frequency component are calculated; a head end voltage and a head end current of one phase operation line in an operation line are tested and a voltage pilot frequency component and a current power frequency component are calculated; and according to the current pilot frequency component and the voltage pilot frequency component, the mutual impedance between the phase test line and the phase operation line is calculated. According to the test methods provided by the invention, mutual impedance and coupling capacitance of transmission lines in parallel can be accurately tested under the circumstances that the lines are operated and there is no power failure, thereby improving test efficiency and accuracy.

Description

technical field [0001] The invention relates to a different-frequency incremental method for coupling parameters of parallel transmission lines, in particular to a testing method for mutual impedance and coupling capacitance of parallel transmission lines. Background technique [0002] The transmission line is an important part of the power system, and the line parameters of the transmission line need to be measured at the initial stage of the line construction. Moreover, although these parameters will not change for a considerable period of time, the line parameters may change due to the aging of the conductor after long-term operation, changes in soil resistivity, or the influence of climate, environment and geographical factors. Therefore, the power dispatching department requires actual measurement of the power frequency parameters of the transmission line. Power frequency parameters generally include DC resistance, positive sequence impedance, phase-to-phase capacitanc...

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Application Information

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IPC IPC(8): G01R27/08G01R27/26
CPCG01R27/08G01R27/2605
Inventor 傅晨钊黄华
Owner EAST CHINA ELECTRIC POWER TEST & RES INST
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