IEEE Std C37.016-2018 pdf download – IEEE Standard for AC High Voltage Circuit Switchers Rated 1 5.5 kV through 245 kV.
3. Definitions For the purposes of this document, the following terms and definitions apply. The IEEE Standards Dictionary Online should be consulted for terms not defined in this clause.6 circuit switcher: A mechanical switching device with an integral interrupter, suitable for making, carrying, and interrupting currents under normal circuit conditions. It is also suitable for interrupting specified primary-bus fault current and transformer-limited fault current that may be less than its rated short-circuit making current and rated short-time withstand current. circuit switcher with isolating disconnect: A circuit switcher with an integrally mounted, isolating disconnect to provide a visible air gap. The disconnect operation and open-close position may be independent of interrupter operation and position or coordinated with the interrupter operation and position. NOTE- A circuit switcher with an isolating disconnect is considered an integrated device including the interrupter and the disconnect. It is referred to as a circuit switcher, and the rating and test apply to the entire device. coordinated disconnect operation: A sequence of operation of a circuit switcher with an isolating disconnect where the disconnect automatically opens after the interrupter opens. Automatic closing of the disconnect may occur before or after the interrupter closes. independent disconnect operation: A sequence of operation of a circuit switcher with an isolating disconnect where the disconnect operation and position are independent of the interrupter operation and position. primary-bus fault current (PBF): The fault current supplied by a system with single or multiple transmission lines connected between the source of the current and the interrupting device. Transformers may also be directly connected in parallel with the lines.
5.6 Rated short-time withstand current (1k) Subclause 5.6 of IEEE Std C37.100.1-2018 is applicable with the following addition: . The rated short-time withstand current shall be equal to or greater than the larger of the rated primary-bus fault breaking current or the corresponding symmetrical current associated with the rated short-circuit making current because of the way circuit switchers can be applied. 5.7 Rated peak withstand current (lp) Subclause 5.7 of IEEE Std C37.100.1-2018 is applicable. 5.8 Rated duration of short-circuit (4) Subclause 5.8 of IEEE Std C37.100.1-2018 is applicable.