Why is it preferred to use a wattmeter(s) to measure power
in three phase systems rather than using a combination of
other instruments e.g. voltmeters, ammeters etc?
Answer Posted / vithal k
by formula one can derive the power through Voltmeter &
Ammeter reading but its impossible to project the power
factor at the time of reading we r taking for both the meter.
Is This Answer Correct ? | 8 Yes | 1 No |
Post New Answer View All Answers
what is ATS & RING MAIN UNIT in Distribution System?And its Function.
what are factors to be consider to design a HT & LT motor?
how to calculate sizing of NGTR (Transformer rating,Loading resistor value and Current rating of resistor) and what is the X/R ratio. Details : 11kV,Capacitance 1.73532 micro farads,40kA for 1sec.
Has someone here done a sizing for a generator (3 phase), its for a pumping station. If you have an example for standby/duty and both running (I) star delta (ii) Soft Starter.
For group 1 , 2 whather i have to prepare my technical or general studies etc? and im graduate in ee engg. for wht posts im eligible for? please tell me!
What is transformation ratio what it describes?
1.why we are using blocks in withoutgaplightning arrester 2.why we ar using bushing in withoutgap lightning arrestor
why on axial hitting up of air blast on hydrogen produced in oil circuit breaker,temperature rises of the core of the arc?
What is the best thing to protect the motor from running over full current. CT or O/L or pressure transducer at the given pressure rating
why industry prefer ht motor instead of lt motor.
State magnitude criterion.
What are the site acceptance tests for power cables, DG Sets, LT panels & 30kVA UPS ?
why we not used 11kva as a direct our electrnics component.
What are the section criteria for cables. Now everywhere XLPE power cable is used or PVC is also used?.
Help need in transformer !? Hello Friends The parameters of 2300/230 v 50hz t/f is R1=0.286 ohm R`2=0.319 ohm Rc=240 ohm X1=0.73 ohm X`2=0.73 ohm Xm=49.2 ohm Secondary Load impedance ZL=0.387+J0.29 solve the exact equivalent circuit with normal voltage across primery.. I know every thing but i cant find CURRENT I1=? and I`2=? Please help me give solution or only Formula please please...