what is the difference between LPF and UPF wattmeter and
where it is used.
Answer Posted / maniveer
LOW POWER FACTOR(LPF) & HIGH POWER FACTOR(UPF)
In open circuit test the secondary winding of transformer is kept open.As the secondary side is open, the entire coil will be purely inductive in nature.So the power will be lagging due to inductive property of the circuit. So LPF(Low Power Factor) Wattmeter is used in OPEN CIRCUIT TEST of Transformer.
In short circuit test the secondary winding of transformer is short circuited. As secondary side is short circuited the entire coil will be purely resistive in nature.So the power factor will be unity. So UPF(Unit Power Factor) Wattmeter is used in SHORT CIRCUIT TEST of Transformer.
Is This Answer Correct ? | 258 Yes | 30 No |
Post New Answer View All Answers
What are the types of control system?
in parallel operation of power transformer why the distance between power transformer and capacitor bank feeder is necessary to know
When calculating the speed of a rotor required for a particular frequency of synchronous generator we use the equation 60f/p Is this p is the number of pole pairs of rotor & do we consider the number of pole pairs in the stator is 1?
define hysteresis loss, eddy current loss and windage loss
WHY THREE PHESE SYSTEM VOLTAGE APPLIED IN 440 VOLT
What is mean by spike arrester(Voltage Operated)
How colour picturetube works & how many year it will works.
What is the formulae of Megger value for a A.C.Motor
I have 440v power coming to facility,( not being used ) can I buy large generator, (gas) to sell power back to electrical co.
explain supply side and demand side energy management with advantages & disadvantages
What happens to a line-frequency of high-frequency transformer when it is first energized/ re-energize?
In Generator How suction compression power and exhaust works ?
What is the effect on power factor, shown by a trivector meter; incase of reverse phase sequence. If the power factor of a system is lag what meter will show in case of reverse phase sequence connected to the meter. and What in case of lead.
what is the difference between switch yard to residential area.and how much required it.
What are the different types of transformers?