6Kumm J J, Weber M S, Schweitzer E O, et al. Philosophies for Testing Protective Relays [ A ]. 20th Annual Western Protective Relay Conference. 1993.19-21.
7Kumm J J,Schweitzer E O, Hou D. Assessing the Effectiveness of Self-tests and Other Monitoring Means in Protective Relays [ A ]. 21st Annual Western Protective Relay Conference. 1994.18-20.
8Kumm J J,Weber M S, Hou D, et al. Predicting the Optimum Routing Test Interval for Protective Relays [ J ].IEEE Trans on Power Delivery, 1995,10.