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An accurate measurement method for zero-sequence parameters of double-circuit non-common-terminal transmission lines

A transmission line and zero-sequence parameter technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as unable to meet measurement requirements and large parameter measurement errors

Active Publication Date: 2019-05-10
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If it is applied to zero-sequence parameter measurement of double-circuit non-common terminal transmission lines, the parameter measurement error will be very large, which cannot meet the actual engineering measurement needs.

Method used

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  • An accurate measurement method for zero-sequence parameters of double-circuit non-common-terminal transmission lines
  • An accurate measurement method for zero-sequence parameters of double-circuit non-common-terminal transmission lines
  • An accurate measurement method for zero-sequence parameters of double-circuit non-common-terminal transmission lines

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Embodiment

[0056] The technical solution of the present invention will be described in detail below in conjunction with the drawings and embodiments.

[0057] An embodiment of the precise measurement of zero-sequence parameters of a double-circuit non-common terminal transmission line includes the following steps:

[0058] Step 1: Measure the double-circuit non-common-terminal transmission line during power failure. In order to obtain the zero-sequence parameters of the line, it is necessary to short the three phases at the beginning and end of the line. The pressurization method of the present invention is to apply a single-phase zero-sequence power supply, and hanging in the air means that the three-phase is short-circuited and open-circuited.

[0059] The line connection method is as follows:

[0060] Measurement method I: the first end of line 1 is pressurized, and the end is grounded; the first end of line 2 is suspended, and the end is grounded.

[0061] Measurement method II: th...

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Abstract

The invention discloses double-circuit non-cotermintal transmission line zero sequence parameter precise measurement method. Using stopping power measurement methods, the end of first three-phase transmission line short sub, applying a single phase power supply on the circuit, at the same time measuring zero sequence voltage and zero sequence current at the beginning and ending of the transmission line, using GPS synchronous timing function guaranteeing strictly synchronous sampling data. Basing on the distributing line parameter model, port characteristics equation of double-circuit non-cotermintal transmission line is obtained, the zero sequence resistance, zero sequence inductance and zero sequence capacitance of the line under test together nine zero sequence parameters are obtained according to measuring and calculating in the invention. The method is suitable for the double-circuit non-cotermintal transmission line zero sequence parameter measurement; the measuring accuracy is high enough to meet the requirements of actual engineering measurement.

Description

technical field [0001] The invention relates to a method for accurately measuring zero-sequence parameters, in particular to a method for accurately measuring zero-sequence parameters of a double-circuit non-common terminal line. Background technique [0002] The transmission line is an important part of the power system and the carrier of electric energy transmission. Transmission line parameters are important parameters for power flow calculation and short circuit calculation, as well as relay protection setting and fault location. Obtaining high-precision line parameter data is of great significance to the safe and stable operation of the power grid. [0003] With the continuous development of the power system, a large number of new lines have been constructed and put into use. Since the new line needs to occupy a large amount of land resources as a transmission corridor. In areas with narrow transmission corridors, in order to meet the demand of the load, the original...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00G01R27/26G01R27/08
CPCG01R27/08G01R27/26G01R31/00
Inventor 胡志坚倪识远
Owner WUHAN UNIV
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