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.
CN101290336AActive Publication Date: 2008-10-22KUNMING UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
KUNMING UNIV OF SCI & TECH
Publication Date
2008-10-22

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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.
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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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