Abstract: In the original design of failure automatic transfer device for standby auxiliary power source in Meizhouwan Power Plant, the transfer was realized by the auxiliary connects of working power source switch which connected to the closing circuit of standby power source. The auxiliary loads outage faults were occurred repeatedly during automatic transfer process due to the long transfer time of the auxiliary power source. The features of auxiliary power supply transfer circuit of Meizhouwan Power Plant were introduced. The experience of transfer circuit technical reformation, which was realized by adding ABB SUE3000 fast transfer device, was analyzed and summarized. The experiment and transfer waveform after reformation show that the auxiliary power supply transfer speed increased remarkably after reformation.

Key words: auxiliary power fast transfer, transfer waveform, ABB SUE3000, parallel transfer