power consumption of a load, estimated at 1500kVA, is to be measured using a 3-phase wattmeter. Load is supplied by 3-phase, 3-wire line, 12kV, line-to-line. Find a suitable wattmeter for the measurement.
This is from "Handbook of Electric Power Calculations" pg 2.5.
Does anyone know how to approach this? the book shows a 120v, 5-A, 3-wire wattmeter as being a good choice.
The book then calculates the line current of 72A and states that a 100:5 ration is chosen for the current transformer. Then the book states that a 100:1 potential transformer is to be used.
I am totally confused. Does anyone have any reference books that cover wattmeter problems?
thanks,
cabby
This is from "Handbook of Electric Power Calculations" pg 2.5.
Does anyone know how to approach this? the book shows a 120v, 5-A, 3-wire wattmeter as being a good choice.
The book then calculates the line current of 72A and states that a 100:5 ration is chosen for the current transformer. Then the book states that a 100:1 potential transformer is to be used.
I am totally confused. Does anyone have any reference books that cover wattmeter problems?
thanks,
cabby