Answer Posted / nizam salih
A pole drop test can be done when the generator is in
standstill condition. Provide a ac voltage of 230V to the
rotor terminals of the salient pole machine and measure the
voltage drop in each pole. At least 5A should flow through
the rotor poles. A small current will not provide good
results. Once the voltage drops are recorded calculate the
drop index as follows.
Index = (max. value - min. value)/avearge value *100 %
An index value of less than 5% reprsents the poles are
good.
This is the usual annual test that we carry out in our
hydro generators.
Nizam Salih, Electrical Engineer, Sri Lanka.
| Is This Answer Correct ? | 10 Yes | 2 No |
Post New Answer View All Answers
What is installed in PAC that is control the humidity
testing of Vector Group – YNaoD II
details of oil cell size of Breakdown voltage test of tranformer oil details as per Standardswith mushroom electrodes?
Can you explain about TEE protection scheme?
Efficient electrical earthing in hard rock area
1)we have 1000 cfm Blower,Dia-1Mtr,Velocity of air 94 m/s 2)We have Natural Air velocity 94m/s 3If i Put Wind Mill in natural air ,speed is 94m/s Then it will generate Assume 100kw 4)If i put same wind mill across the Blower,air speed is same 94m/s now the Question is Will it generate 100 kw?
what is Fan Control Cubicle
salam&hi, i need to know about how can i calculate an enough current for the new building before i submit it to the suppliers
explain the process of commutation in a dc machine. Explain what are inter-poles and why they are required in a dc machine.
Difference between ac parallel circuit and ac series circuit?
Why 11kv to be generated in generation station
How we select the vector group of 3phase power transformer?
What is the differance between 2 dc motors of armature voltage 660 v and 440 v?
Application Comparison between 22KV (UE)and 33KV (E) system. Are we allowed to use 33KV (E) cable in lieu of 22KV (UE) cable. What are the technical disadvantages.
What is Traction? 1KVA Alternator, How much urrent taken?
