FERC-725X, Mandatory Reliability Standards: Voltage and Reactive (VAR) Standards

NERC established the Voltage and Reactive (“VAR”) group of Reliability Standards, which consists of two continent-wide Reliability Standards, VAR-001-4.2 and VAR-002-4.1. These two standards were designed to maintain voltage stability on the Bulk-Power System, protect transmission, generation, distribution, and customer equipment, and support the reliable operation of the Bulk-Power System. Voltage stability is the ability of a power system to maintain acceptable voltage levels throughout the system under normal operating conditions and following a disturbance. Failure to maintain acceptable voltage levels (i.e., voltage levels become too high or too low) may cause violations of System Operating Limits (“SOLs”) and Interconnection Reliability Operating Limits (“IROLs”), resulting in damage to Bulk-Power System equipment, and thereby threaten the reliable operation of the Bulk-Power System.

The latest form for FERC-725X, Mandatory Reliability Standards: Voltage and Reactive (VAR) Standards expires 2021-06-30 and can be found here.

VAR-001-4.2 Reliability Standard

Federal Enterprise Architecture: Energy - Energy Conservation and Preparedness