Answer Posted / janani venkatesan
Most of the alternators have thir pole shoes slotted to
receive copper bars of a grid or damper windings.Copper
bars are short circuited at both ends by heavy copper
rings.These DAMPERS are useful in preventing hunting(speed
fluctuations) in generators and are needed in synchronous
motors to provide starting torque.Under normal running
conditions, damper windings does not carry any current
because rotor runs at synchronous speed.They tend to
maintain balanced 3phase voltage under unbalanced load
conditions.
| Is This Answer Correct ? | 24 Yes | 1 No |
Post New Answer View All Answers
What is boucholz relay and the significance of it in to the trformer?
if we apply 1000ADC instead of 100ADC or We apply 50ADC instead of 100ADC,What will be happened in the test result value.Pl explain
What is the bundle conductor?
IF alternator SCR value will be high means what happen in alternator efficency at operating power factor of 0.8
why dc is used in control circuit for mv & hv switchgear instead of ac
what is the total power generation in india?
How to calculate KVA/VA rating of PT or CT from primary & secondary voltage or primary & secondary current?
In a power conditoining unit (inverter) of a solar plant when we measure the d.c. current fed by different strings of solar plates to inverter, the current in the negative wire is less almost by 1 ampere to the current in its positive wire say current in positive wire 5 A , then current in negative wire of the same string is 4 A. Since the current entering should be equal to current leaving then why the current is noticably less in negative wire.
What if the difference beween internal and exrteranal LBB?
What's the difference between non break power supply and non break non short break power supply
Why we make earth connection with Transformer Body and What will be the minimum size of copper wire as per code with respect to KVA rating of Transformer?
What happen in ups if phase reverse?
DIFFERENCE BETWEEN NORMAL TRAFO AND THRISTER TRAFO?
What should be setting for alarm,tripping and cooling fan on for power transformer's oil temp. and winding temp. indicator?
how to select the automotive wire size by mathematical calculation. for xenon headlamp with ballast. the ballast given data voltage 10-17v,current permenant 6amp, run up phase is 15amp, peak at swicth on max 400micro sec is 40amp.the sum of cable resistance is 150mohm.please provide referenc document if any for relating the peak at switch on current,time & wire wire size
