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The Study on the Lightning Protection Performance of Double Circuit for 220kV Transmission Line

Author: YanXiPing
Tutor: LiJingLu
School: Changsha University of Science and Technology
Course: High Voltage and Insulation Technology
Keywords: double-circuit transmission line back striking shielding failure lightning protection performance aimability transformation measure
CLC: TM862
Type: Master's thesis
Year: 2009
Downloads: 486
Quote: 7
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Abstract


In recent years, with our country’s rapid economic development, electric power load demand is getting increased day by day. Using the same tower double-circuit extra-high voltage(EHV) transmission line such as 220kV, 500kV or higher voltage for long distance power transmission has become a necessity. These programs can greatly reduce transmission line corridors. However, the breakdown accident often occurred by lightning strike. So it has important significance and applied value for profound analysis of lightning protection performance in accordance with the various mechanism of breakdown accidents caused by lightning strike.Based on the wide collection and summarizing of running conditions of 220kV transmission lines in Chizhou, Anhui, the current lightning protection situation is analyzed. Choosing 220kV chiguan #2886 line、guanju #2850 line as research objects, systematic study is made on the lightning protection performance of 220kV double-circuit transmission line by ATP-EMTP and strack distrance method. The main problems of Chizhou 220kV double-circuit transmission line are summarized and modification measures based on the region topography of Chizhou are suggested as following:1. Reverse phase arrangement can effectively decrease the simultaneously rate of flashover should.2. Multi-pole-reclosing can effectively limit the harm of power system from simultaneity flashover should.3. It is still one of the most effective method to reduce the rate of lightning back striking on double-circuit transmission line by decreasing grounding resistance of tower.4. The installation of anti-flashover should lateral-lightning rod is one of the effective method of anti-around hit.5. The installation of line arrester is a very good remedy measure in few regions where is big across, has high rate resistance of soil which is difficult to reduce and furthermore, the effect of shielding operation is very unsatisfactory by existing measure.6. Reducing the shielding angle of lightning shield line can reduce the occurrence of shielding failure lightning accident. 7. Erecting coupling-groundwire along the whole line can do inhibitory effect to shielding failure and back striking.8. Reinforced insulation is the most effective and economical method of decreasing the rate of lightning back striking.9. Taking feasible method to decrease the galloping of ground wire and the moving speed of thundercloud can effectively reduce accidents caused by lightning.10. For new lines, methods should be taken such as adding a lightning shield line and optimizing design of the tower head to improve the level of resistance-lightning of 220kV transmission line.The results of this paper will propose practical reference value and important theory basis for the design and operation work of lightning-prevention of 220kV double-circuit transmission line, then it can be extended rectifying and reforming of lightning-prevention in other areas, so it has important reference meaning. The thesis has practical application value and direct economical and social benefit also.

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CLC: > Industrial Technology > Electrotechnical > High Voltage Engineering > Overvoltage and Its Protection > Over-voltage protection devices
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