PROTECTIVE SYSTEM ISSUES DURING RESTORATION

This paper is one of a series presented on behalf of the System Operat ion Subcommittee with the intent of focusing industry attention on pow er system restoration issues. Performance of protective systems may be measured by the relative percentages of correct and appropriate relay operations, correct but inappropriate operations, wrong tripping, and failure to trip [1]. The primary reason for ''correct but inappropria te'' operations is attributed to the power system changes. During rest oration, the power system undergoes continual changes and therefore it is subject to ''correct but inappropriate'' relay operations.