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Emergency Dispatch Strategy Considering Remaining Lives of Transformers

An emergency dispatch strategy (EDS) is proposed as a power system operational support tool following a transformer malfunction. First, a revised model based on IEEE C57.91 provides a method to calculate the remaining life of a transformer from the data of current load and elapsed life. Second, the life function and the constraints of transformers and the system are constructed to formulate the dispatch model. Finally, a realistic test case based on the Taiwan power system is used to demonstrate the practical applications of the EDS method. The results, when compared with those obtained using the traditional balance loads method (BLM), indicate that the EDS method is beneficial because power operators would have more time to replace a damaged transformer and successfully defer a power outage.