Topic:"Grid Modernization" in M03232

NON-CONFIDENTIAL 1 Response IR-1: (cont'd) 2 3 The database of relays contains all mechanical relays in the system. A number of those 4 relays are no longer in service because they have been replaced with newer digital relays, 5 or parts o...

AI summary The response discusses the database of relays in NSPI's system, noting that many mechanical relays have been replaced by digital ones or removed due to system retirements and upgrades for renewable energy integration. Testing of relays is conducted according to a 3-year program and NPCC requirements, with one relay not tested due to the significant impact of its removal.

NSPI's Relay Testing Report 2009 - P-401.32/ Matter No.: M03232 The Board has reviewed Nova Scotia Power Inc.'s ("NSPI") Relay Testing Report for 2009 received by the Board on June 3, 2010. Board staff requested additional information with...

AI summary The Board reviewed NSPI's 2009 relay testing report, noting a 2% failure rate and approving a 6-year testing cycle for 69 kV/138 kV systems instead of NSPI's requested 10-year cycle. NSPI argued that extended cycles were cost-effective due to low failure rates, but the Board emphasized continued monitoring.