Answer / jitesh kotecha

induction motor is an inductive device and we know that in
inductive circuit current lags behind voltage due to the
inductive reactance of the motor. so that the phase angle
between voltage and current will increase. and the cosine
angle i.e. P.F. will decreases.to improve the p.f we have
to supply leading Kvar to the system. it is possible by
different way. either use capacitor bank which will supply
leading kvar to the syswtem and overall lagging kvar will
decreases and if we see the power triangle then the angle
between KW and KVA will decrease so that the p.f. will
improve. second method is to run synchronous motor on
leading p.f.in parallel with the system.

Answer / karthikeyan

the above answer saying synchronous motor can be used but
we never see a synchronous installed near indution motor.
We always uses static capacitors to improve the overall PF.
why because only in High end generating stations and
substations the synchronous motor can be used to imrove
system PF. for medium and small loads we can go for static
capacitor bank.

Answer / ravi

Bcoz the IM will drwa an Lagging Current..

We can use a APFC Bank to maintain it.

Answer / umesh

induction motor have inductive materials which lags behand
the the voltage,that's way power factor decreases it
connected to induction motor,
PF can improve the power factor by connecting the
syncronous motor parralel to the incution motor ,

Syncronous motor running cost is costly, it will be run in
idle

Answer / aniket kumar

by decreasing the reactive power we can maintain the power factor to unity

Answer / raushan singh

We can use capacitors to improve power factor in
Synchronous Alternators.

I need a 33/690V Dry type transformer.How to select IP class for this transformer.This will be an outdoor transformer located in a highly polluted environment.

3 Answers  

The series field winding has low resistance while the shunt field winding has high resistance. Why?

0 Answers  

If a motor of 8.5 KW with same load and using in both Star & Delta one by one,then which will take more current in star connected or in delta connected

4 Answers  

where we use stardelta starter and dol starter

4 Answers   HCL,

1.Can we use 6.6/11KV 300sq mm xlpe 3core cable for LT use (415 Volt). 2. If we use it for LT then what is the current rating

0 Answers  

In transformer which temp should be less oil temp are winding temp?

7 Answers   TCS,

In AC if the direction of current keeps reversing every half cycle, how does it propogate through the transmission lines?

0 Answers  

What is an exciter and how does it work?

7 Answers   FCUK, Lotte Chemical Titan, TATA,

why we generally use 3.5 core cable or in other word 1/2 core for neutral and also confirm me that in balance conditiob(3 phase)current in neutral will zero

7 Answers   HCIL, Jindal, Siemens,

how can we say that stator magnetic field rotates with synchronous speed?can we derive?

0 Answers  

Which material is used for the core of a transformer and why?

0 Answers  

how to select the mpcbs and contactor for 3 phase 30 hp star delta motors.for plc control.and tell me the calaculation for future use.

0 Answers