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T-type electric transmission line positive sequence capacitance measuring method

A technology of transmission lines and positive sequence capacitors, which is applied to measuring devices, measuring electrical variables, measuring resistance/reactance/impedance, etc., can solve problems such as affecting the normal operation of the power system, lack of accurate line parameters, and inability to ensure the correct operation of the device.

Inactive Publication Date: 2013-07-24
DEZHOU POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[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 used for power system faults Analysis, power flow calculation, short-circuit current calculation, relay protection setting calculation, and selection of power system operation mode, etc. These line parameters are necessary parameters for establishing a mathematical model of the power system before work. Without accurate line parameters, it is difficult to guarantee the above calculations. If it is correct, the correct action of the device cannot be guaranteed, which will affect the normal operation of the power system

Method used

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  • T-type electric transmission line positive sequence capacitance measuring method
  • T-type electric transmission line positive sequence capacitance measuring method
  • T-type electric transmission line positive sequence capacitance measuring method

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Experimental program
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Embodiment

[0038] Embodiment comprises the following steps:

[0039] Step 1: Select a T-shaped transmission line to be tested for blackout measurement, and the T-shaped transmission line is composed of a first line, a second line and a third line.

[0040] The measurement method is as follows:

[0041] 1) The ends of the second line and the third line of the T-shaped transmission line are three-phase open circuit respectively, and a three-phase positive-sequence test voltage source is added to the first end of the first line to measure the positive-sequence voltage and positive-sequence current at the first end of the first line respectively;

[0042] 2) The ends of the first line and the third line of the T-shaped transmission line are three-phase open circuit respectively, and a three-phase positive-sequence test voltage source is added to the first end of the second line to measure the positive-sequence voltage and positive-sequence current at the first end of the second line respecti...

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Abstract

The invention discloses a T-type electric transmission line positive sequence capacitance measuring method. The method specifically comprises the steps: a T-type electric transmission line to be measured is disconnected with electricity, positive sequence voltage is sequentially exerted on the head ends of three branch lines of the T-type electric transmission line, the rest tail ends of the branch lines without the voltage are opened in a three-phase mode, a positive sequence fundamental wave voltage phasor and a positive sequence fundamental wave current phasor are obtained through a Fourier algorithm by positive sequence voltage data and positive sequence current data obtained at the voltage exerting ends, and a positive sequence capacitance parameter of each branch line of the T-type electric transmission line is calculated through a relational expression of the positive sequence fundamental wave voltage phasor and the positive sequence fundamental wave current phasor. The T-type electric transmission line positive sequence capacitance measuring method overcomes shortages of an existing measuring method and improves accuracy of a measuring result of the T-type electric transmission line positive sequence capacitance parameters.

Description

technical field [0001] The invention belongs to the technical field of power system measurement, in particular to a method for measuring positive sequence capacitance of a T-shaped 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. [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 used for power system faults Analysis, power flow calculation, short-circuit current calculation, relay protection setting calculation, and selection of power system operation mode, etc. These line parameters are necessary parameters for establishing a ma...

Claims

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Application Information

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IPC IPC(8): G01R27/26
Inventor 张源森崔德民曹清涛柴永强刘鹏李晓博胡志坚张承学李传奇王晶陈世纯
Owner DEZHOU POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER
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