PRC-022-1: Under-Voltage Load Shedding Program Performance

Purpose
Ensure that Under Voltage Load Shedding (UVLS) programs perform as intended to mitigate the risk of voltage collapse or voltage instability in the Bulk Electric System (BES).

Applicability

Effective Date
May 1, 2006

Requirements  
R1. Each Transmission Operator, Load-Serving Entity, and Distribution Provider that operates a UVLS program to mitigate the risk of voltage collapse or voltage instability in the BES shall analyze and document all UVLS operations and Misoperations. The analysis shall include:

R1.1. A description of the event including initiating conditions.

R1.2. A review of the UVLS set points and tripping times.

R1.3. A simulation of the event, if deemed appropriate by the Regional Reliability  Organization.  For most events, analysis of sequence of events may be sufficient and dynamic simulations may not be needed.

R1.4. A summary of the findings.

R1.5. For any Misoperation, a Corrective Action Plan to avoid future Misoperations of a  similar nature.

R2. Each Transmission Operator, Load-Serving Entity, and Distribution Provider that operates a  UVLS program shall provide documentation of its analysis of UVLS program performance to its Regional Reliability Organization within 90 calendar days of a request.  (Retirement approved by FERC effective January 21, 2014.)

Measures
M1. Each Transmission Operator, Load-Serving Entity, and Distribution Provider that operates a  UVLS program shall have documentation of its analysis of UVLS operations and Misoperations in accordance with Requirement 1.1 through 1.5.

M2. Each Transmission Operator, Load-Serving Entity, and Distribution Provider that operates a UVLS program shall have evidence that it provided documentation of its analysis of UVLS program performance within 90 calendar days of a request by the Regional Reliability Organization.  (Retirement approved by FERC effective January 21, 2014.)


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