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Method for realizing single-end fault range finding by utilizing long-line equation

A long-term equation and fault location technology, applied in the field of power system

Active Publication Date: 2006-10-25
BEIJING SIFANG JIBAO AUTOMATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The present invention proposes a new algorithm aiming at the calculation of fault distance measurement in the protection of UHV and long lines, which can better solve the problem of the impedance measured by the single-ended fault data with the increase of the line length and the voltage level. increase the error

Method used

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  • Method for realizing single-end fault range finding by utilizing long-line equation
  • Method for realizing single-end fault range finding by utilizing long-line equation
  • Method for realizing single-end fault range finding by utilizing long-line equation

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Embodiment Construction

[0030] specific implementation plan

[0031] The invention relates to a method for distance measurement of relay protection faults in the field of power systems. Disclosed is a method for fault distance measurement through single-end voltage and current. If there is a shunt reactor in the high-voltage line, the installation place of the shunt reactor can be set as a reference point k (such as figure 1 , taking the m terminal as an example, the calculation method of the n terminal is the same), by comparing the impedance measured at the protection installation with the impedance from the protection installation to the reference point k, if the measured impedance is greater than the impedance from the protection installation to the reference point k , then use the long-term equation to protect the measured voltage at the installation place electric current Convert the voltage to the reference point k by means of phasor calculation electric current , the current Subtra...

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Abstract

The present invention discloses fault range measuring method through single end voltage and current. Said invention first utilizes the end voltage and current to calculate the impedance, if the result is positive, it meaning the protective calculated impedance being greater than the impedance from installation place to reference point, using formula to calculate the real distance, if the result is negative, it meaning the trouble point being the middle place, the reference point should be less than 400k, said method is not influence by circuit distribution capacitance.

Description

technical field [0001] The invention relates to the field of power systems, and more particularly relates to a new method for realizing single-end fault distance measurement by using single-end quantities in relay protection. Background technique [0002] The transmission distance of high-voltage transmission lines is long, and the terrain environment is complicated, so the occurrence of faults is basically inevitable. When a fault occurs on a transmission line, it is necessary to quickly find out the fault and eliminate it in time or find and deal with it as soon as possible, because the time for troubleshooting directly affects the guarantee of power transmission and the safe operation of the system. The longer the exclusion time, the greater the loss caused by the power outage, and the greater the impact on the stable operation of the entire system. Therefore, to eliminate or deal with transmission line faults as soon as possible is not only crucial to repairing lines in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 徐振宇杜兆强黄少锋魏会利张效宇
Owner BEIJING SIFANG JIBAO AUTOMATION
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