IEEE PC37.30.5-2017 pdf free download – PC37.30.5TM/D1.2 Draft Standard for Definitions for AC High-Voltage Air Switches Rated Above 1000 V.
1.1 Scope
The terms and definitions in this standard cover all high-voltage enclosed and non-enclosed, indoor and outdoor air switches rated in excess of 1000 V used primarily in connection with generation, transmission, distribution, and conversion of electric power. This includes such switch types as disconnect, horn-gap, fault-initiation, and ground for manual or power operation. The following switch types are not covered by this standard: interrupter switches, distribution cutouts ftted with disconnecting blades, and switches used in metal-enclosed and pad-mounted switchgear. This standard also does not apply to load-break separable insulated connectors, circuit-breakers, circuit-switchers, or reclosers.
1.2 Purpose
The definitions of terms and explanatory notes relating thereto contained in this standard are not intended to encompass all possible meanings of the terms. They are intended for the sole purpose of establishing only those meanings of terms used in standards for switchgear assemblies. They do not purport to encompass other meanings that the terms may properly have when used in connection with other subjects.
In some instances, terms and deinitions that are not identical to those in this standard have been developed by other branches of induty. Where this situation exists, the definitions in this standard shall be used for AC Higb-Voltage Air Swithes Rated Above 1000 V covered by the C37 series of standards.
2. Definitions
For the purposes of this document, the fllowing terms and definitins apply.
The IEEE Slandards Dictionary Online should be consulted for terms not defined in this clause.
accessories: Devices that perform a secondary or minor duty as an adjumnet or refinement to the primary or major duty ofa unit of equipment. air switch: A switching device designed 40 closse and open one or more eletie ciruts by means of guided scparable contacts that separate in air.
are reach: The distance from a point midway between the are extremities to the most remote point of the are at the time of its maximum length.
arcing horn: Ome of a pair of diverging electrodes on which an arc is extended 10 the point of extinction after the main contacts of the switching device have parted.
attachments: Accessories 1o be atached 10 switchgear ppratus, as distinguished from auilaries
bell crank: A lever with two arms placed at an angle diverging from a given point, thus changing the diection of motion of a mechanism.
bell crank hanger: A support for a bell crank. blade (disconneeting blade) (of a switching device);: The moving contact member that enters or embraces the contact clips. blade guide (sw itch): An atachment lo help assist in proper alignment of the blade and contact edip when closing the switch.
blade latch: A latch used on a swich 10 hold the switch blade in the closed position.
break distance (of a switching device): The minimum open-gap distance between the main-ircuit contacts, or live parts connected therelo, when the contacts are in the open position.
bus support: An insulating support for a bus. It includes one or more insulator umnits with ftings for fastening to the mouning structure and for receiving the bus center break
switching device: A mechanical swithing device in which both contacts are moveable and engage at a point substantially midway between their supports. elips: See: contact clips (of a mechanical switching device)
closing operating time (of a switch): The interal during which the contacts move ftom the fully open position to the fully closed position.IEEE PC37.30.5 pdf download.