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Method for identifying lightning stroke fault and non-lightning stroke fault of transmission line

A lightning strike fault and transmission line technology, applied in the fault location, measuring electrical variables, measuring current/voltage, etc., can solve the problems of line load current, line length and transition resistance, which are not easy to implement, and affect the reliability of transmission lines. , to achieve the effect of simple and easy-to-implement waveform analysis and judgment process

Active Publication Date: 2015-03-18
GUANGDONG ELECTRIC POWER SCI RES INST ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the lack of effective technical means to identify the cause of the fault, and the quality of the line-hunting work is sometimes difficult to control, it is difficult to find the real cause of some accidents
This restricts the improvement of the operation and maintenance level of the transmission line, and directly affects the reliability of the safe operation of the transmission line.
[0004] The previous method of using power frequency voltage to identify lightning strikes and non-lightning strike fault types is easily affected by line load current, line length and transition resistance, and the criteria are complex and difficult to implement

Method used

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  • Method for identifying lightning stroke fault and non-lightning stroke fault of transmission line
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  • Method for identifying lightning stroke fault and non-lightning stroke fault of transmission line

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Embodiment Construction

[0019] see figure 1 , figure 1 It is a flow chart of steps in an embodiment of a method for distinguishing lightning strike faults and non-lightning strike faults of transmission lines based on high-frequency traveling wave currents in the present invention.

[0020] The identification method includes the following steps:

[0021] S-1, Real-time sampling and recording: install high-speed acquisition equipment to conduct real-time sampling and recording of the three-phase transient current on the transmission line;

[0022] In this step, a high-speed sampling device with a sampling frequency of 10 MHz is used to sample and record the current on the transmission line in real time to obtain the three-phase transient current of the transmission line.

[0023] S-2, judge the fault phase;

[0024] In this step, compare the maximum magnitude of the three-phase transient current recorded at the same observation point ,and , the one with the largest amplitude is the fault phase;...

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Abstract

The invention discloses a method for identifying a lightning stroke fault and a non-lightning stroke fault of a transmission line. The method comprises the following steps of utilizing a high-speed data acquiring device to sample and record three-phase transient current on a transmission line in real time, comparing the maximum amplitude of the three-phase transient current at the same observation point, identifying the fault phase, analyzing the starting time and wave tail time of the fault phase current, calculating the wave tail time, and comparing the wave tail time with a set threshold value, and identifying whether the fault is a lightning stroke fault or a non-lightning stroke fault. In the past, the method for identifying the fault type by utilizing a power frequency voltage is usually influenced by the load current, line length and transition resistance. Based on the fault high frequency transient signal, the method provided by the invention has the characteristics of being free from the influences of the line load current, line length and transition resistance, and moreover, the method has the advantages of simple criterion and easiness in realizing.

Description

technical field [0001] The invention relates to a method for distinguishing types of lightning strike faults and non-lightning strike faults of transmission lines, in particular to a method for distinguishing transmission line lightning strike faults and non-lightning strike faults based on high-frequency traveling wave current. Background technique [0002] The transmission line is an important part of the power grid and an indispensable connecting element of the power system. Due to the complex and changeable natural conditions such as geological conditions and meteorological conditions in the areas it passes through, there are many factors that may cause faults, so most of the faults in the power system occur on the transmission line. Once a fault occurs, it will not only cause direct damage to the electrical equipment, affect the power supply of the system, but also often directly threaten the stability of the system. [0003] After a fault occurs on a high-voltage...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08G01R19/00
Inventor 彭向阳李鑫钱冠军
Owner GUANGDONG ELECTRIC POWER SCI RES INST ENERGY TECH CO LTD
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