Alternating-current powerline thunderbolt shielding failure and counterattack recognition method

An identification method and transmission line technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as lightning strike faults that need to be further studied, and achieve clear physical concepts, easy implementation, and intuitive theoretical basis.

Active Publication Date: 2008-10-22
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

With the in-depth research on traveling wave protection and transient protection, some researchers have paid attention to the distinction between lightning faults and non-lightning faults, and have achieved certain results [7-14] , but the distinction between shielding and counterattack in lightning faults needs further study

Method used

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  • Alternating-current powerline thunderbolt shielding failure and counterattack recognition method
  • Alternating-current powerline thunderbolt shielding failure and counterattack recognition method
  • Alternating-current powerline thunderbolt shielding failure and counterattack recognition method

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Embodiment Construction

[0048] When a lightning strike fault occurs on an AC transmission line, the above principles can be used to correctly identify lightning shielding faults and counterattack faults. The specific implementation process is as follows Figure 14 shown.

[0049] Specific steps are as follows:

[0050] 1) When the sudden change of any phase current |i(n+1)-i(n)|-|i(n)-i(n-1)| is greater than the setting value, the high-speed data acquisition with a sampling frequency of 1MHz and The wave recording device starts and records the current traveling wave waveform 10ms after the fault;

[0051] 2) Calculate the current traveling wave zero-mode component U using the Karenbauer transformation matrix 0 (t) and the line mode component U α (t), U β (t), as shown in formula (1):

[0052] U 0 ( t ) ...

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Abstract

The invention relates to a method for recognizing lighting shielding failure and counterattack of an AC transmission line. The different theories generated by the electromagnetic transient component of the lighting shielding failure and the counterattack of the high-voltage DC transmission line and different paths of transmission of the thunderbolt electromagnetic transient component on the circuit cause that the energy distribution of different frequency bands of the generated current transient state signals are different greatly. Therefore, in a travelling wave analysis and high-speed acquisition system at the protective installation position, the small wave analysis is adopted to extract the energy of the zero modulus current in different frequency bands. The shielding failure and the counterattack are differentiated according to the property of the energy distribution. A large amount of emulations show that the method is reliable and effective and can recognize accurately the shielding failure and the counterattack of the AC transmission line. The method has intuitive theory base and clear physical concepts, thereby being easy to implement, being widely applied to an AC system protective device, providing important data for the lightening protection design of the AC transmission line and providing reference for the operation and maintenance of the transmission line.

Description

technical field [0001] The invention relates to an identification method for lightning shielding and counterattack of an AC transmission line, and belongs to the technical field of lightning electromagnetic transient monitoring in electric power systems. Background technique [0002] When thundercloud discharges, lightning overvoltage is formed on the wire or electrical equipment, which can be divided into direct lightning strike and induced lightning overvoltage [1] . The overvoltage caused by direct lightning may reach a large amplitude. Even for UHV transmission lines with high insulation strength, lightning tripping accidents will still be caused by the flashover of insulators. Direct lightning strike faults are divided into two types: shielding strike and counterattack. The shielding strike is that the lightning bypasses the lightning protection line and directly hits the transmission line, while the counterattack is the lightning strike directly on the lightning prote...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01R31/08
Inventor 束洪春张广斌王永治程春和孙涛彭仕欣张加贝朱子钊朱盛强
Owner KUNMING UNIV OF SCI & TECH
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