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Can some one please explain briefly use of SOE (sequence of event) in power plant control loop.
Also what variables of Power plant are assigned as SOE.

The application for SOE is in the analysis of "what happened to cause a trip" or shutdown. Electric power distribution has a series of protective relays to prevent overload of distribution lines and to limit the load on generation equipment. In a complex distribution network, overload trips are automatic and sequential. When one overloaded circuit trips (the protective relay opens) the load often shifts to other circuits that are tripped in turn if they are overloaded. The only way to analyze exactly the sequence of trips after the fact, is to examine the trip log for the exact time of each trip. This is called a "post-mortem analysis." It is generally regarded that the trip time must be recorded to an accuracy of + or - 1 millisecond to determine the correct sequence - but only if all clocks are synchronized to the same time base.

Dick Caro
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