Double-terminal location method for fault points of electric transmission line

A double-ended ranging, transmission line technology, applied in the fault location, detecting faults according to conductor types, measuring electricity and other directions, can solve problems such as the destruction of the normal working state of the system, the harm of the stable operation of the system, the danger of the fault point, etc., and achieve huge reductions. The effect of economic loss, fast calculation speed and accurate fault location

Inactive Publication Date: 2016-07-27
STATE GRID CORP OF CHINA +2
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Problems solved by technology

[0003] The problem of fault location has been around for a long time. Faults in power systems are generally divided into transient faults and permanent faults; transient faults can generally be removed by automatic reclosing, but there are still certain dangers at the fault point, and there are still faults. Possibly, it is necessary to find the fault point in time to ensure the normal operation of the line; when a permanent fault occurs on the transmission line, the normal working state of the system will be destroyed. At this time, it is necessary to quickly find and eliminate the fault. The greater the harm to the stable operation of the entire system

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Embodiment Construction

[0022] The invention provides a method for double-terminal distance measurement of the fault point of the transmission line, which is characterized in that it is applied in the optical fiber differential protection that appears in pairs, and the specific algorithm operation is realized by the protection device, and the differential protection on both sides The automatic collection of the current and voltage of the lines on both sides can be realized, and the electrical quantity on the opposite side can be transmitted bidirectionally through the optical fiber. The method includes the following steps:

[0023] Step 1. Calculate the electrical quantity after the fault: Assume that the two sides of the power line are the M side and the N side respectively. After the line fails, the zero-sequence current is calculated from the current collected by the TA on the M side of the line. The calculation formula of the zero-sequence current for: , and transmit the current on the N side to...

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Abstract

The invention discloses a double-terminal location method for fault points of an electric transmission line.The double-terminal location method is applied to optical fiber differential protection appearing in pairs, special algorithm operation is achieved through the protection device, automatic collecting of current and voltage of two-side lines can be achieved through two-side differential protection, and the opposite-side electrical quantities are subjected to two-way transmission through optical fibers.The double-terminal location method includes the following steps that 1, the faulted electrical quantities are calculated; 2, the numerical values of the voltage quantities at the faulting positions are calculated; 3, the values of the current quantities at the faulting positions are calculated; 4, the calculated results in the step 3 and the step 4 and the resistance characteristic of ground resistance are used to obtain the final fault-location result.

Description

technical field [0001] The invention relates to a method for performing double-terminal distance measurement on fault points of transmission lines. Background technique [0002] With the continuous development of industry, electric energy, as a clean secondary energy, has an increasing proportion in current energy applications, and has become an important guarantee for human normal life and production. The high-voltage transmission line is the lifeblood of the power system. As the link of energy transmission, it is an important part of the power system, and it is also the place where the most faults occur in the power system. After the system fails, it is of great significance to quickly find the location of the fault point and discover potential safety hazards in time for the safe and stable operation of the system and reliable power supply. [0003] The problem of fault location has been around for a long time. Faults in power systems are generally divided into transient ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/085G01R31/088
Inventor 印吉景张宇蓉
Owner STATE GRID CORP OF CHINA
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