IEEE C37.250-2020 IEEE Guide for Engineering, Implementaton, and Management of System Integrity Protecton Schemes.
The need for a SIPS and the actions it is intended to take are typically determined through system planning studies such as power fow, stability, and/or other modeling of the power system as part of the transmission operations function. For example, in North America, the system planning engineer typically models the contingencies specifed in the North American Electric Reliability Corporation (NERC) standard TPL-001. 9 System studies identify conditions when system performance is not acceptable. Although this process is not described here in signifcant detail, it is vital to recognize that this process identifes intent, high-level monitoring elements, and performance requirements for the scheme and is the basis for an engineering solution to implement the particular SIPS. System studies also assist in general understanding of monitoring and set points, arming and alarming elements to be engineered during the scheme design. The general objectives of this planning process are as follows: —Identify all critical single- or multiple-system contingencies that result in unacceptable system conditions. Usually these involve the unplanned unavailability or incorrect operation of one or more elements resulting in unanticipated system conditions from which the system may not be able to recover. Mitigation will result in a stable system that avoids prolonged stress to any portion of the system that would lead to further problems. —Identify the power system problem that results from the contingencies of concern. This problem is generally a violation of performance standards or other applicable planning or operating criteria. SIPS are typically designed to mitigate the effects of one or a limited set of specifc contingencies that result in unacceptable system conditions. —Identify any system confguration or system load or generation conditions that would make the system vulnerable to the critical contingencies.
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