Power Switchboard


Also found in: Acronyms.

power switchboard

[′pau̇·ər ′swich‚bȯrd]
(electricity)
Part of a switch gear which consists of one or more panels upon which are mounted the switching control, measuring, protective, and regulatory equipment; the panel or panel supports may also carry the main switching and interrupting devices together with their connection.

Power Switchboard

 

a unit containing a set of interconnected electrical equipment and instruments mounted as a structural unit on a rack, switchboard, or panel with the purpose of receiving and distributing electric power at electric power stations and step-down substations and at industrial shops.

High-voltage power switchboards as a rule contain circuit breakers, a feeder breaker, metering assemblies, and sets of protective relays. The feeder breaker is mounted on a roll-out dolly to facilitate inspection and repairs. Low-voltage power switchboards contain link cutouts, knife switches, fuses, automatic circuit breakers, and sets of meters and protective apparatus. The operation of the unit is monitored by meters, protective devices, and signal lamps, all mounted on the front panel, along with the control levers and buttons. Power switchboards can switch circuits both under rated operating conditions and during short circuits. For safety during inspection and repair, a unit is equipped with an automatic block system that is triggered when the housing is opened or the cell is pulled out.

V. K. IVANOV

References in periodicals archive ?
The bullet train was halted after a crew member found smoke coming from a power switchboard and activated an emergency alarm.
1, 3 and 4 reactors at the crippled Fukushima Daiichi nuclear power plant, a day after the key system was suspended due to a suspected problem with a power switchboard.
The utility said a power switchboard might have caused the problem and it is trying to replace the damaged switchboard or reconnect the cooling system to other switchboards.
said it found burn marks on a makeshift power switchboard, and a dead animal nearby.