AI-generated summary
· Application · 10/28/2010
NSEB directs Nova Scotia Power to adopt a six-year relay testing cycle, rejecting NSPI's proposal to extend to ten years
AI summary
- The Board reviewed NSPI's 2009 Relay Testing Report (Matter No. M03232), which covered 325 relays tested during the year, with 10 (3%) replaced or repaired for serious functional failures, 53 (16%) recalibrated, and 259 (80%) found acceptable.
- Over the full three-year cycle (2007–2009), total program costs reached approximately $440,000, with 2009 alone costing $92,200; failure rates across the cycle averaged approximately 2%.
- NSPI requested Board approval to extend its relay testing schedule from a three-year to a ten-year cycle, citing low failure rates, the existence of backup protection for failed units, and the argument that physical testing itself creates single-contingency risks during the testing period.
- The Board accepted that the three-year cycle had served its purpose of establishing relay integrity but was not persuaded that a jump to a ten-year interval was appropriate.
- By letter dated October 28, 2010, the Board directed NSPI to implement a six-year testing cycle for 69 kV and 138 kV system relays, and to continue filing annual reports in the current format; relays classified as Bulk Power System Elements remain subject to a four-year cycle.
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What was filed
Documents filed on this day
- 05589 Board Letter giving directions