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alternating current alternating-current supply anode current anode voltage apparatus arc discharge arrangement auxiliary B.Sc breaker British Thomson-Houston bus-bars cathode cent chapter circuit-breaker commutation component condenser connected contactor control grid Copper Loading corresponding cubicle current arc current convertor current flowing cycloconvertor diagram diffusion pump direct current direct-current discharge path electrons energy Engineering English Electric excitation feeders frequency full load glass-bulb rectifier grid-control grid-controlled rectifier harmonic ignition angle impulse input invertor kVA rating line current load current means mercury mercury-arc rectifier mercury-vapour motor negative no-load obtained operation output voltage phase equalizer phase voltage Pirani gauge positive ions power factor primary current primary winding pump r.m.s. value reactance reactive power rectifier equipment rectifier transformer rectifier unit relay Second Edition secondary phase secondary winding shown in Fig single-phase sinusoidal six-phase steel-tank rectifier substation switch synchronous synchronous condenser three-phase tion twelve-phase vacuum valve vapour voltage cycle volts wave-form whilst zero