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Sequential tripping strategy for a transmission network back-up protection expert system

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6 Author(s)
J. C. Tan ; Manitoba Univ., Winnipeg, Man., Canada ; P. A. Crossley ; P. G. McLaren ; I. Hall
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This paper describes a sequential tripping strategy used in a wide area back-up protection expert system (BPES) to combat situations in which protection relays have maloperated or information is missing. The BPES is an innovative back-up protection scheme designed to prevent the occurrence of widespread blackouts. The BPES evaluates the certainty that transmission lines are likely to be affected by the fault and uses a sequential tripping strategy to isolate the fault if a firm decision is not available due to maloperated relays and/or missing information. The mode of analysis and the sequential tripping strategy ensures that the BPES will clear a fault at minimum risk to the network. An example is included to demonstrate how the certainty factor based sequential tripping strategy is employed by the BPES to clear a fault which occurred on the South Western part of the UK National Grid System

Published in:

IEEE Transactions on Power Delivery  (Volume:17 ,  Issue: 1 )