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alternating current alternating-current supply anode current anode voltage apparatus arc discharge arrangement automatic auxiliary B.Sc breaker British Thomson-Houston bus-bars cathode cent chapter circuit-breaker commutation component condenser connected contactor control grid corresponding current arc current convertor current flowing cycloconvertor diagram diffusion pump direct current direct-current direct-current side discharge path double three-phase electrons energy Engineering English Electric excitation 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 practice primary current primary winding pump r.m.s. value ratio 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