Study on Shunt Protection Gap Design of 35 kV Line Arrester
35 kV lines generally equip no overhead grounding wire and often encounter direct lightning,resulting in over-load and failure of line lightning arresters.In this paper,the parallel gap structure of 35 kV line arrester is proposed.The parallel gap structure and distance parameters are obtained through equivalent current calculation and gap discharge test.When the lightning current amplitude is higher than the threshold value of protection action,the residual pressure of the arrester breaks down the parallel discharge gap to prevent lightning overload damage.The impact discharge test and field application of 35 kV arrester show that the parallel clearance can reduce the lightning damage probability of 35 kV line ar-rester to a certain extent.
line arresterlightning over loadparallel clearanceshock discharge test
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