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Method for measuring positive sequence parameters of ultra-high voltage transmission line based on double end measuring information

A transmission line and measurement information technology, applied in the direction of fault location, etc., can solve the problem of large measurement error

Inactive Publication Date: 2011-07-20
WUHAN UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned technical problems, the purpose of the present invention is to provide a method for measuring the positive sequence parameters of UHV transmission lines based on double-ended measurement information, so as to overcome the existing methods when measuring the positive sequence parameters of EHV and UHV transmission lines. Due to the disadvantage of large measurement errors, a new method for measuring positive sequence parameters of transmission lines is proposed, which realizes accurate measurement of positive sequence parameters of transmission lines

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  • Method for measuring positive sequence parameters of ultra-high voltage transmission line based on double end measuring information
  • Method for measuring positive sequence parameters of ultra-high voltage transmission line based on double end measuring information
  • Method for measuring positive sequence parameters of ultra-high voltage transmission line based on double end measuring information

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Embodiment Construction

[0042] Below in conjunction with accompanying drawing, the present invention will be further described with specific embodiment:

[0043] The method for measuring positive sequence parameters of UHV transmission lines based on double-terminal measurement information provided by the present invention adopts the following steps:

[0044] Step 1: Power off the transmission line under test.

[0045] Step 2: When measuring the positive sequence impedance of the transmission line, short-circuit the three phases at the end of the transmission line, apply three-phase power frequency voltage at the first end of the transmission line, and measure the wiring as attached figure 1 shown. In the figure, PT is a voltage transformer, and CT is a current transformer. Under the time synchronization of the global satellite positioning system, the measurement system A and the measurement system B arranged at the first and last ends of the transmission line simultaneously measure the three-phase...

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Abstract

The invention relates to the technical field of measuring parameters of a transmission line of a power system, in particular to a method for measuring positive sequence parameters of an ultra-high voltage transmission line based on double end measuring information. The method comprises: measuring positive sequence impedance and positive sequence capacitance of the transmission line; when measuring the positive sequence impedance of the transmission line, cutting off the to-be-measured transmission line, performing three-phase short connection to the tail end of the transmission line, adding athree-phase voltage on the front end of the transmission line; when measuring the positive sequence capacitance of the transmission line, cutting off the to-be-measured transmission line, performing three-phase opening to the tail end of the transmission line, adding the three-phase voltage on the front end of the transmission line; using a global satellite positioning system technology to simultaneously measure the three-phase voltage on two ends of the transmission line and the three-phase current on two ends of the transmission line, and synchronously sampling the three-phase voltage and three-phase current. The method in the invention solves the influence of the distributed capacitance on the transmission line to the positive sequence parameters measurement so as to greatly increase the precision of the positive sequence parameters measuring result of the transmission line.

Description

technical field [0001] The invention relates to the technical field of parameter measurement of power system transmission lines, in particular to a method for measuring positive sequence parameters of UHV transmission lines based on double-terminal measurement information. Background technique [0002] The transmission line is the carrier of power transmission and one of the main components of the power system, which plays an extremely important role in the power system. The power frequency parameters of transmission lines mainly include positive-sequence impedance, positive-sequence capacitance, zero-sequence impedance, zero-sequence capacitance, and mutual inductance between multi-circuit mutual inductance lines. The accuracy of protection setting calculation and selection of power system operation mode is directly related to the accuracy of these calculation results. Accurately obtaining the parameters of transmission lines is of great significance to the power system, e...

Claims

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Application Information

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IPC IPC(8): G01R31/08
Inventor 胡志坚李炜
Owner WUHAN UNIV
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