Background In its original Versions 1 and 2, VAR-001-4.1 Voltage and Reactive Control allowed the TOP to exempt GOPs from operating the AVR in automatic mode. With the onset of Version 3 and later (May 9, 2012), the additional WECC Variance was added taking away the TOP’s discretion to exempt a GOP from the requirement to operate an AVR in automatic mode. Although the discretion of VAR-001-X was not fully transferred to the VAR, 10 stated exclusions were added there to counterbalance that loss. VAR-002-WECC-2 is Less Stringent VAR-001-04.1 requires that AVRs be in operation 100% of the time, unless otherwise exempted via discretionary powers. requires AVRs be in operation 98% of the time, unless otherwise excluded by claiming under a limited universe of exclusions. This makes VAR-002-WECC-2 less stringent than VAR-001-04.1. Thus, reliability is better served under the more stringent approach of VAR-001-04.1. Standard to be Retired VAR-002-WECC-2 Automatic Voltage Regulators VAR-002-WECC-2 Description and Change Addressed in Other Standards Requirement in Approved Standard Justification VAR-002-4 Generator Operation for Maintaining Network Voltage Schedules VAR-002-4 is superior. 100% of all operating hours 98% of all operating hour R1. The Generator Operator shall operate each generator connected to the R1. Generator Operators and The more stringent approach of interconnected transmission system in the automatic voltage control mode (with its Transmission Operators shall have AVR in better serves reliability. automatic voltage regulator (AVR) in service and controlling voltage) or in a service and in automatic voltage control different control mode as instructed by the Transmission Operator unless: 1) the mode 98% of all operating hours for 98% of all operating hours generator is exempted by the Transmission Operator, or 2) the Generator Operator synchronous generators or synchronous
Background In its original Versions 1 and 2, VAR-001-4.1 Voltage and Reactive Control allowed the TOP to exempt GOPs from operating the AVR in automatic mode. With the onset of Version 3 and later (May 9, 2012), the additional WECC Variance was added taking away the TOP’s discretion to exempt a GOP from the requirement to operate an AVR in automatic mode. Although the discretion of VAR-001-X was not fully transferred to the VAR, 10 stated exclusions were added there to counterbalance that loss. VAR-002-WECC-2 is Less Stringent VAR-001-04.1 requires that AVRs be in operation 100% of the time, unless otherwise exempted via discretionary powers. requires AVRs be in operation 98% of the time, unless otherwise excluded by claiming under a limited universe of exclusions. This makes VAR-002-WECC-2 less stringent than VAR-001-04.1. Thus, reliability is better served under the more stringent approach of VAR-001-04.1. Standard to be Retired VAR-002-WECC-2 Automatic Voltage Regulators VAR-002-WECC-2 Requirement in Approved Standard Addressed in Other Standards Description and Change Justification 98% of all operating hour R1. Generator Operators and Transmission Operators shall have AVR in service and in automatic voltage control mode 98% of all operating hours for synchronous generators or synchronous VAR-002-4 Generator Operation for Maintaining Network Voltage Schedules 100% of all operating hours R1. The Generator Operator shall operate each generator connected to the interconnected transmission system in the automatic voltage control mode (with its automatic voltage regulator (AVR) in service and controlling voltage) or in a different control mode as instructed by the Transmission Operator unless: 1) the generator is exempted by the Transmission Operator, or 2) the Generator Operator VAR-002-4 is superior. The more stringent approach of better serves reliability. 98% of all operating hours
WECC-0127%20VAR-002-WECC-2%20Request%20to%20Retire%20Attachment%20F%20Technical%20Justification%20-%20NERC%20Crosswalk%20Template%203-2-2017.doc.docx