phase association of 3PH L&T static CT meter is wrong.
means 1PH & 1 CT connected properly and other 2 voltage and
CT's inter changed. what would be the impact in the reading?
- 3 Answers
- 6891 Views
- KSEB, I also Faced
- E-Mail Answers
Answer Posted / shankar
Lets us understand this problem by taking load as constant and the incoming supply initially it was RYB in sequence.
let Vr=10<0 Ir=5<-10
Vb=10<-120 Ib=10<-20
Vc=10<-240 Ic=15<-10
Now the total power is P=VrIrcos(-10)+VyIycos(-140)+VbIbcos(-250).
=41.5 watts.
Now lets us consider Y and B phases were wrongly connected to each other
Vr=10<0 Ir=5<-10
Vy=10<-240 Iy=10<-20
Vb=10<-120 Ib=15<-10
Now the total power is P=VrIrcos(-10)+VyIycos(-240)+VbIbcos(-130).
=3.781 watts
so the energy meter will records less units
| Is This Answer Correct ? | 2 Yes | 2 No |
Post New Answer View All Answers
What is Percentage impedence of a transformer? why it is expressed at a percentage? what is the importance of percentage impedence in case of a transformer?
What is Instantaneous Earth fault relay,how will work
what maximum range of star & delta in hp or kw ?
i want to know d working mechanism of tafe tractors next i like to know d engine type of apache bighs can anyone help me
What is the difference between in Fourier series and Fourier Transform. and please tell me the difference between both of them and the why we use them in communication system?
What should be the values of settling time, peak time, steady state error, overshoot, rise time, MPOS (Maximum percent over shoot) to keep the system in transient state, to keep the system in steady state ?
sir my exam is on 19/6/2013 under electrical branch pls send me sample aptitude questions as well as sample technical questions for jindal steel and power company
A well system is when , no. of bus bar is less or more. Tell me the concept of it.
what is the saturation point of crgo lamination.
why we use circuit breakers for switching instead of normal switching device?
The power factor of the fixed load is 0.8, now the p.f is varying from 0.8 to 0.5.
What are operating procudures & Safety precautions to be observed while operating OLTC in manual mode ?
When is lag lead compensator is required?
what are carbondioxide and dcp used in fire extinguishers
Explain about retrofitting of machine tool.
