TOP-008-1: Response to Transmission Limit Violations

Purpose
To ensure Transmission Operators take actions to mitigate SOL and IROL  violations.

Applicability
Transmission Operators.

Effective Date
January 1, 2007

Requirements
R1. The Transmission Operator experiencing or contributing to an IROL or SOL violation shall  take immediate steps to relieve the condition, which may include shedding firm load.

R2. Each Transmission Operator shall operate to prevent the likelihood that a disturbance, action,  or inaction will result in an IROL or SOL violation in its area or another area of the  Interconnection.  In instances where there is a difference in derived operating limits, the Transmission Operator shall always operate the Bulk Electric System to the most limiting parameter.

R3. The Transmission Operator shall disconnect the affected facility if the overload on a transmission facility or abnormal voltage or reactive condition persists and equipment is endangered.  In doing so, the Transmission Operator shall notify its Reliability Coordinator and all neighboring Transmission Operators impacted by the disconnection prior to switching, if time permits, otherwise, immediately thereafter.

R4. The Transmission Operator shall have sufficient information and analysis tools to determine the cause(s) of SOL violations.  This analysis shall be conducted in all operating timeframes.  The Transmission Operator shall use the results of these analyses to immediately mitigate the SOL violation.

Measures
M1. The Transmission Operator involved in an SOL or IROL violation shall have and provide upon  request evidence that could include, but is not limited to, operator logs, voice recordings, electronic communications, alarm program printouts, or other equivalent evidence that will be used to determine if it took immediate steps to relieve the condition. (Requirement 1)

M2. The Transmission Operator that disconnects an overloaded facility shall have and provide upon  request evidence that could include, but is not limited to, operator logs, voice recordings, electronic communications, alarm program print outs, or other equivalent evidence that will be used to determine if it disconnected an overloaded facility in accordance with Requirement 3 Part 1

M3. The Transmission Operator that disconnects an overloaded facility shall have and provide upon request evidence that could include, but is not limited to, operator logs, voice recordings or transcripts of voice recordings, electronic communications, or other equivalent evidence that will be used to determine if it notified its Reliability Coordinator and all neighboring  Transmission Operators impacted by the disconnection prior to switching, if time permitted,  otherwise, immediately thereafter. (Requirement 3 Part 2)

M4. The Transmission Operator shall have and provide upon request evidence that could include,  but is not limited to, computer facilities documents, computer printouts, training documents, copies of analysis program results, operator logs or other equivalent evidence that will be used to confirm that it has sufficient information and analysis tools to determine the cause(s) of SOL violations. (Requirement 4 Part 1)

M5. The Transmission Operator that violates an SOL shall have and provide upon request evidence that could include, but is not limited to, operator logs, voice recordings or transcripts of voice recordings, electronic communications, or other equivalent evidence that will be used to confirm that it used the results of these analyses to immediately mitigate the SOL violation. (Requirement 4 Part 3)


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