Patent ID: 7230809

Claim:
A synchronization system for checking synchronization of AC voltage sources on power transmission lines, said synchronization system comprising: a first and second circuit breaker for opening and closing an AC circuit associated with the power transmission lines, a first and second voltage transformer wherein said first and second voltage transformers transmit voltage attributes of the AC circuit associated with said first circuit breaker and second circuit breaker, respectively, a first and second protective relay individually communicating with said first and second voltage transformers, respectively, wherein said first and second protective relays are adapted to exchange the voltage attributes transmitted by said first and second voltage transformers, a bidirectional communications link connecting said first and second protective relays, wherein said first and second protective relays are adapted to exchange the voltage attributes transmitted by said first and second voltage transformers via said bidirectional communications link, said first and second protective relay each further comprising a sync-check function for comparing the voltage attributes transmitted by said first and second voltage transformers.