This LiveWire Spotlight article concerns the second draft response to a request by NERC’s System Protection and Control Subcommittee to clarify relay failure scenarios that must be evaluated during contingency planning. It addresses FERC’s concern in Order 754 that complex protection schemes are inadequately evaluated – citing the Westwing outage as an example.

The second draft of the interpretation of TPL-003/004 has been posted for industry stakeholder review and a concurrent ballot. Clients have until December 5, 2012 to return comments and to vote on the initiative.