Requirements and Measures Rationale Blocks will be relocated to the Guidance section when the project is complete. Rationale for Requirement WR1: This is a planning criterion. WR 1 addresses NERC TPL R5 and R6. WR1 is designed to state the base planning criteria the system must meet – unless an individual entity or group of entities has different criteria. WECC Requirements WR2 and WR3 allow for entities to have different criteria. Neither WR2 nor WR3 changes the WR1 default; rather, WR2 and WR3 allow for deviation from the WR1 default. WR2 allows for a more stringent approach without changing the WR1 default. A more stringent approach may be used in accordance with WR2 so long as all the affected parties agree. Similarly, WR3 allows deviation from the default with the additional protection that when used, other Transmission Planners and Planning Coordinators are allowed to use the same criteria on that part of the system for the same category of planning events (e.g., P1 and P2). In the context of Requirement WR1, the word “nominal” carries its common definition and could be, for example, either the base voltage or the operating voltage as established in the entity’s Planning Assessment. This means that nominal may have a varying definition or use from one entity to the next. If an entity does not specify what is nominal, the default use of the term nominal defaults to the kilo-volt class that is specified in the WECC Base Case, with the exception of the 500 kilo-vote class, in which case the default nominal would be specified as 525 kilo-volt. Requirement WR1.1.2 refers to the post automatic equipment adjustment effect prior to manual adjustment. WR1. Each Transmission Planner and Planning Coordinator shall use the following default base planning criteria, unless otherwise specified in accordance with Requirements WR2 and WR3: Steady-state voltages at all applicable Bulk-Electric System (BES) buses shall stay within each of the following limits: 1.1.1 95 percent to 105 percent of nominal for P0 event (system normal contingency event powerflow);
Requirements and Measures Rationale Blocks will be relocated to the Guidance section when the project is complete. Rationale for Requirement WR1: This is a planning criterion. WR 1 addresses NERC TPL R5 and R6. WR1 is designed to state the base planning criteria the system must meet – unless an individual entity or group of entities has different criteria. WECC Requirements WR2 and WR3 allow for entities to have different criteria. Neither WR2 nor WR3 changes the WR1 default; rather, WR2 and WR3 allow for deviation from the WR1 default. WR2 allows for a more stringent approach without changing the WR1 default. A more stringent approach may be used in accordance with WR2 so long as all the affected parties agree. Similarly, WR3 allows deviation from the default with the additional protection that when used, other Transmission Planners and Planning Coordinators are allowed to use the same criteria on that part of the system for the same category of planning events (e.g., P1 and P2). In the context of Requirement WR1, the word “nominal” carries its common definition and could be, for example, either the base voltage or the operating voltage as established in the entity’s Planning Assessment. This means that nominal may have a varying definition or use from one entity to the next. If an entity does not specify what is nominal, the default use of the term nominal defaults to the kilo-volt class that is specified in the WECC Base Case, with the exception of the 500 kilo-vote class, in which case the default nominal would be specified as 525 kilo-volt. Requirement WR1.1.2 refers to the post automatic equipment adjustment effect prior to manual adjustment. WR1. Each Transmission Planner and Planning Coordinator shall use the following default base planning criteria, unless otherwise specified in accordance with Requirements WR2 and WR3: Steady-state voltages at all applicable Bulk-Electric System (BES) buses shall stay within each of the following limits: 1.1.1 95 percent to 105 percent of nominal for P0 event (system normal event powerflow); contingency
WECC-0100%20Posting%205%20TPL-001-WECC-CRT-3%20-%20Clean.docx