Abstract: The reformation scheme of lightning protection system for weak current system of Wuxijiang Hydroelectric Power Station was presented, the reformation process of lightning protection system for H9000 computer monitoring system and automation equipment was described in detail. After the reformation, the system went through many times shutting down and starting up operation and several times thunder strike, and there is no equipment damaged by over-voltage. This show that the lightning protection effect of the reformed system is better.

Key words: lightning protection system for weak current system, reformation scheme, reformation measures, reformation effect