Metering of Alternating Current |
Common terms and phrases
100 per cent 2-element 3-phase 90 degrees accuracy alternating current ampere-hour amperes angle ball calibration cause cent load compensation connected current coils current poles current transformers current-coil flux delta connected demand pointer demand register diagram dial driving duplex recorder eddy currents electrical electromagnet energy field four-wire four-wire circuits friction full load gear train impulses induction INSTRUMENT TRANSFORMERS interval kilowatt hours lag loop lagging power factor light-load adjustment line current load curve magnetic circuit maximum demand measure mechanism meter disc meter element neutral operation permanent magnet phase POLYPHASE METER APPLICATIONS potential coil potential flux potential pole potential-coil flux principle ratio reactive meter reading RECORDING DEMAND METERS reset rotating secondary service meter Shallenberger shown in Fig single-phase meter speed standard synchronous motor thermal three-phase three-wire tion torque two-element meter unity power factor vector voltage volts watthour constant watthour meter wattmeter watts wire zero