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Anti-interference measurement method for zero sequence impedance of super-high-voltage/ultrahigh-voltage multi-loop power transmission line

A transmission line, zero-sequence impedance technology, applied in the direction of measuring resistance/reactance/impedance, measuring devices, measuring electrical variables, etc., can solve problems such as unreliable results of transmission line parameters, eliminate influence, improve accuracy and precision Effect

Active Publication Date: 2011-07-27
SUZHOU POWER SUPPLY OF JIANGSU ELECTRIC POWER +1
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AI Technical Summary

Problems solved by technology

Especially with the emergence of UHV (750-1000kV) transmission lines in recent years, the results of transmission line parameters measured according to existing measurement methods are even more unreliable

Method used

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  • Anti-interference measurement method for zero sequence impedance of super-high-voltage/ultrahigh-voltage multi-loop power transmission line
  • Anti-interference measurement method for zero sequence impedance of super-high-voltage/ultrahigh-voltage multi-loop power transmission line
  • Anti-interference measurement method for zero sequence impedance of super-high-voltage/ultrahigh-voltage multi-loop power transmission line

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Embodiment Construction

[0033] Below in conjunction with accompanying drawing, preferred specific embodiment of the present invention is described:

[0034] figure 1 What is shown is a transmission line to be tested. The head and end of the transmission line to be tested are respectively connected to the side substations. There are other multiple transmission lines (not shown in the figure) between two adjacent substations. The present invention measures Methods The parameters of the transmission line to be tested are measured under the condition that other multi-channel transmission lines are not powered off.

[0035] The present invention mainly measures the zero-sequence impedance of the transmission line to be tested. In order to measure the zero-sequence impedance, firstly, the transmission line is powered off, and the three-phase short-circuit at the end of the transmission line is grounded, and the three-phase short-circuit at the first end , apply the single-phase AC power frequency voltage ...

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Abstract

The invention provides an anti-interference measurement method for the zero sequence impedance of a super-high-voltage / ultrahigh-voltage multi-loop power transmission line, which comprises the following steps of: firstly powering off the power transmission line; shorting and grounding three phases at the tail end of the line; shorting the three phases at the head end of the line; applying voltageto the head end of the power transmission line by directly using a single-phase power frequency power supply of a transformer substation where a voltage-application point of the power transmission line is located; and measuring zero sequence voltage applied to the head end of the power transmission line and zero sequence current applied to two ends of the power transmission line at the same time.In order to eliminate the influence of power frequency interference, when the zero sequence impedance is measured, harmonic components included in data of the measured zero sequence current and zero sequence voltage are utilized to calculate harmonic zero sequence impedance of the power transmission line, and finally the harmonic zero sequence impedance is converted into power frequency zero sequence impedance of the power transmission line.

Description

[0001] technical field [0002] The invention belongs to the technical field of power system transmission line parameter measurement, and in particular relates to an anti-interference measurement method for transmission line zero-sequence impedance in the case of interference. Background technique [0003] With the development of the scale of the power system, there are more outgoing lines in power plants and substations, and more and more mutual inductance lines. [0004] Transmission line parameters are the basic parameters for short-circuit calculation, relay protection and automatic device setting, correct action of some protection components, and fault analysis and location. Without accurate line parameters, it is difficult to ensure the accuracy of the above calculation results, which will affect the power system. safe, stable and economical operation. [0005] The zero-sequence impedance of the line and the zero-sequence mutual impedance between the lines will affe...

Claims

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Application Information

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IPC IPC(8): G01R27/08
Inventor 汤峻高扬徐建刚陈志勇殷鉴钱杰胡志坚
Owner SUZHOU POWER SUPPLY OF JIANGSU ELECTRIC POWER
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