| Bus is the important part in power plant and transformer substation, thesecurity of bus working will touch the running of power system safely and steadily.Distributed digital bus protection will be the major development trend of digital busprotection, but it has to solve the problems of rapid communication and synchronoussampling. Based on this, this text put forward a new optic-fiber double-loop communicatednetwork which adopts token-ring type communication standard. Besides, this text adopts asoftware-hardware synchronous time project. This communicated network has highcommunication speed and simple structure, and this communicated network's security andcapability are good, and precision of synchronous sampling is high. Based on these, thiscommunicated network can completely satisfy the need of distributed digital bus protection.And do distributed bus protection's hardware designing, software programming and hardwaredebugging.
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