Panasonic KW8M User Manual
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Contents
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KW8M Eco-POWER METER (1A/5ACT input type)316.1.5 Electricity Charge・It displays the standard electricity charge for the integral electrical power.[CHARGE]Lighting*When the value exceeds ‘99999999’, will be displayed.6.1.6 Power factor・It displays the loads’ power factor.*Before start measuring, select phase and wire system according to the measured load.When selected system does not meet it, it can not measure correctly. (Refer to the explanation ofsetting mode.)Sample of lagging phase Sample of leading phase[cosφ]Lighting・How to calculate power factorEco-POWER METER displays power factor by calculating as below.Power factor operation is a method assuming balanced load. The error might be big when it measuresunbalanced load.Single-phase two-wireSingle-phase three-wireThree-phase four-wire 1P3W: a=23P4W: a=3Three-phase three-wireVoltage ｘ CurrentPF＝ Instantaneous electric powera ｘ ｘPF＝ Instantaneous electric powerAverage ofeach phase VAverage ofeach phase A3 ｘ ｘPF＝ Instantaneous electric powerAverage ofeach phase VAverage ofeach phase A√ |
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