IEEE Std C37.30.5-2018 pdf download – IEEE Standard for Defnitions for AC High-Voltage Air Switches Rated Above 1000 V.
moving contact: A conducting part that bears a contact surface arranged for movement to and from the stationary contact. nonenclosed switches, indoor or outdoor: Mechanical switching devices designed for service without a housing restricting heat transfer to the external medium. offset (outboard) bearing (air switch): A component of a switch-operating mechanism designed to provide support for a torsional operating member and a crank that provides reciprocating motion for switch operation. open operation (of a switching device): The movement of the contacts from the normally closed to the normally open position. opening operating time (of a switch): The interval of time it takes during switch operation to move from the fully closed to the fully open position. opening operation (of a switching device): See: open operation (of a switching device). outrigger (of a switching device terminal): An attachment that is fastened to or adjacent to the terminal pad of a switching device to maintain electrical clearance between the conductor and other parts or, when fastened adjacent, to relieve mechanical strain on the terminal, or both. overhead line charging current: Current supplied to an unloaded overhead line. phase spacing (of a switching device): The distance between center-lines of the current carrying parts of the adjacent poles of the switching device.
sleet hood (of a switch): A cover for the contacts to minimize the possibility of sleet or ice interfering with successful operation of the switch. stationary contact member: A conducting part having a contact surface that remains substantially stationary. stick (hook) operation: Manual operation of a switching device by means of an insulated switch (hook) stick. switch stick (switch hook): A device with an insulated handle and a hook or other means for performing stick operation of a switching device. switching device (switch) non-mechanical switching device, mechanical switching device: A device designed to close or open, or both, one or more electric circuits. NOTE—The term switch in international (IEC) practice refers to a mechanical switching device capable of opening and closing rated continuous load current. terminal pad: A usually fat conducting part of a device to which a terminal connector is fastened. tilting-insulator switch: A mechanical switching device in which the opening and closing travel of the blade is accomplished by a tilting movement of one or more of the insulators supporting the conducting parts of the switch. torsional mechanism: An operating mechanism that transfers rotary motion from the operating means through a pipe or shaft to open or close the switching device.