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Method for measuring zero-sequence parameters of double-circuit transmission lines

A technology of transmission lines and zero-sequence parameters, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as large measurement errors

Active Publication Date: 2012-05-02
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the drawbacks of the existing method in measuring ultra-high voltage and ultra-high voltage mutual inductance line parameters due to ignoring the influence of distributed capacitance, which leads to too large measurement error of line zero-sequence parameters, and proposes a super / special based on distributed parameter model A new method for measuring zero-sequence parameters of high-voltage double-circuit transmission lines

Method used

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  • Method for measuring zero-sequence parameters of double-circuit transmission lines
  • Method for measuring zero-sequence parameters of double-circuit transmission lines
  • Method for measuring zero-sequence parameters of double-circuit transmission lines

Examples

Experimental program
Comparison scheme
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Embodiment

[0053] Embodiment comprises the following steps:

[0054] Step 1, select a double-circuit transmission line for live measurement or power-off measurement, and the double-circuit transmission line is composed of line I and line II.

[0055] When live measurement is selected, four or more of the following six independent measurement methods are arbitrarily selected to measure double-circuit transmission lines;

[0056] (1) Single-phase trip of line I, reclose after 0.5 to 1.0 seconds; line II runs normally with power on;

[0057] (2) Line I runs normally with power on; Line II single-phase trips, and then recloses after 0.5 to 1.0 seconds;

[0058] (3) Make the three-phase load of line I unbalanced; line II runs normally with electricity;

[0059] (4) Line I runs normally with electricity; make the three-phase load of line II unbalanced;

[0060] (5) Line I is powered off, the first end is short-circuited with three phases, single-phase voltage is applied, and the end three-p...

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Abstract

The invention discloses a method for measuring zero-sequence parameters of double-circuit transmission lines. The method comprises the following steps: measuring the zero-sequence parameters of the double-circuit transmission lines in the manner of live line measurement or power cut measurement; by utilizing the global positioning system technology, simultaneously measuring the zero-sequence voltage and the zero-sequence current at the head ends and the tail ends of the double-circuit transmission lines to realize synchronous sampling on the zero-sequence voltage and the zero-sequence current; and then, working out the respective zero-sequence self impedance and zero-sequence self capacitance, and zero-sequence mutual impedance and zero-sequence mutual capacitance between the double-circuit transmission lines. In the method for measuring the zero-sequence parameters of double-circuit transmission lines, the distributed parameter models of the double-circuit transmission lines are established, and the influences of distributed capacitors on measured results are considered, thereby, the accuracy of the measured results of the zero-sequence parameters of the double-circuit transmission lines is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of power system measurement, in particular to a method for measuring zero-sequence parameters of a double-circuit transmission line. Background technique [0002] The transmission line is one of the main components of the power system, and it is also the carrier of power transmission, which plays a great role in the power system. Double-circuit transmission lines are usually erected between power plants or between power plants, that is to say, there are two indirect connection lines from A power plant or substation to B power plant or substation, that is, two transmission lines. [0003] The parameters of transmission lines mainly refer to their power frequency parameters, which include positive sequence impedance, zero sequence impedance, positive sequence capacitance, zero sequence capacitance, coupling capacitance and mutual inductance impedance between multiple circuits, etc. These parameters are mainly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/02G01R27/26G01R31/00
Inventor 胡志坚李传奇
Owner WUHAN UNIV
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