Relay Performance During Stable Power Swings Reliability Standard

The Federal Energy Regulatory Commission proposes to approve Reliability Standard PRC-026-1 (Relay Performance During Stable Power Swings), submitted by the North American Electric Reliability Corporation. The proposed Reliability Standard is designed to ensure that applicable entities use protective relay systems that can differentiate between faults and stable power swings. In addition, the Commission requests comment regarding the potential burden of modifying the applicability of proposed Reliability Standard PRC-026-1 to include relays with a time delay of 15 cycles or greater in instances where either (1) an element has been identified by a Planning Coordinator as potentially susceptible to power swings or (2) an entity becomes aware of a bulk electric system element that tripped in response to a stable or unstable power swing due to the operation of its protective relay(s), even if the element was not previously identified by the planning coordinator.