Industry Reports


A Technical Reference Paper - Fault- Induced Delayed Voltage Recovery Version 1.2

The North American Electric Reliability Corporation (NERC) is a not-for-profit international regulatory authority whose mission is to assure the reliability and security of the bulk power system in North America. NERC develops and enforces Reliability Standards; annually assesses seasonal and long‐term reliability; monitors the bulk power system through system awareness; and educates, trains, and certifies industry personnel.
Since Fault Induced Delayed Voltage Recovery (FIDVR) may have a significant impact at all levels of the electric power system, it is necessary to raise the awareness of the PAC community in order to help our industry develop and implement solutions that will reduce the probability for FIDVR events or reduce its impact when they occur. The goal of this industry report is to introduce to our readers the NERC technical paper, so PAC specialists can address the challenges and look for the most efficient solutions.

 A Delayed Voltage Recovery event, or more popularly today, a Fault Induced Delayed Voltage Recovery (FIDVR), is the phenomenon whereby system voltage remains at significantly reduced levels for several seconds after a transmission, subtransmission, or distribution fault has been cleared. Significant load loss due to motor protective device action can result, as can significant loss of generation, with a potential secondary effect of high system voltage due to load loss. A severe event can result in fast voltage collapse. More

Relion advanced protection & control.
BeijingSifang June 2016