Setting Calculation Method and Protection Coordination for Relay Protection System in Consideration of Arc Flash

With the development of the power distribution system and equipment diversification, the accuracy of setting values is required to be at a high level to realize well protection coordination for the relay protection system. The inaccurate setting values and defective protections may lead to lots of severe accidents, such as, the arc flash accident, which has been paid more attention recently. In this paper, a relay protection method considering the influence of arc fault is proposed. Then, the electrical engineering software is used to perform a more accurate setting calculation and protection coordination. Also, the arc flash hazard is weakened by the arc flash protection device. Based on the results, the modified configuration of relay protection can protect the power distribution system more effectively.