Interested to Buy Any Domain ? << Click Here >> for more details...
What is polarisation index value?.(pi value)
Simple & brief definition of polarisation index?..
- 7 Answers
- 19185 Views
- I also Faced
- E-Mail Answers
Answer Posted / kapil mishra
PI is a variation of the IR test. It is the ratio of IR
measured after voltage has been applied for 10 minutes (R10)
to the IR measured after one minute (R1), i.e.
PI = R10/R1
Low value of PI indicates that the winding may have been
contaminated with oil, dirt etc or absorbed moistures. In
the test, a relatively high DC voltage is applied between
the copper conductor and the stator or rotor core usually
between the winding and ground as the machine core & body
are grounded)
| Is This Answer Correct ? | 10 Yes | 0 No |
Post New Answer View All Answers
After synchronization with grid what is the demand value QKVAR and how we will maintain that?
What is shutdown of electrical sub station?
r we are using in gas turbine mark (5) frame (6) (made in india Bhel 1997) Ā
how we can calculate 2 phase welding transformer rating or total power?
what are the steps involved in generator load test?
what happen if the load connected to the induction motor is taken away? the same question for synchoronous generator in synch i think that the the exitation voltage will appear on the terminal only if so plz answer me
What is the name of the winding from which the supply is taken for load connections?
what is size of 3phase 4wire cable to be used for 11 ton ductable A.C and how to calculate cable size for different load
This is reqd for a 1MW Solar power plant..We have 2DC outputs from the solar panels Connected to 2INVERTOR panels.. Output from invertor is 3ph,280v,500kva,50hz.These are connected to individual ACB.This has to be stepped up to 11KV ,1250KVA SYSTEM.Now can I use (1) one more ACBTO GIVE A COMBINED OUTPUT OF 1000KVA,280V & STEP UP THE OUTPUT BY USING a single two winding 3 ph transformer 11kv/1250kva. or (2)use the two outputs and connect to one three winding transformer of above rating..Pls suggestwith details.
If the Brush of DC motor is shifted by 90 deg, then what happens to voltage and torque? Both voltage and torque are zero. how to justify the answer?
what is parellel power factor correction?
BSNL TTA EXAM QUESTION
Name the types of motors used in vacuum cleaners, phonographic appliances, vending machines,refrigerators, rolling mills, lathes, power factor improvement and cranes.
is there any current and voltage drop on liquid resistance starter water/soda tank ?
sir i have a car stereo system and there is jack on him so can u tell me a way to find out their power terminals on the jack or on the circuit board"
