WHY POLARITY TEST OF CT IS VERY IMPORTANT IN SWITCHGEAR

Question Posted / raj

3 Answers
20000 Views
Birla, Reliance, I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

WHY POLARITY TEST OF CT IS VERY IMPORTANT IN SWITCHGEAR..

Answer / raghavendran.r

CT works on subtractive polarity.It is essential for
reducing the flux build up in the CT secondary, otherwise
immense flux build up will cause insulation burn out.Also
the CT secondary should not be left open.

The other power transformers work on additive polarity
principle.Hence it is required to check the polarity.

Is This Answer Correct ?

25 Yes

10 No

WHY POLARITY TEST OF CT IS VERY IMPORTANT IN SWITCHGEAR..

Answer / anand

Polarity Test is needed for Ct's because if polarities are not properly matched (Subtractive generally),relays which were based on connections of ct will maloperate(E/L Stability)and hence the lines will unnecessary trip....

Is This Answer Correct ?

12 Yes

7 No

WHY POLARITY TEST OF CT IS VERY IMPORTANT IN SWITCHGEAR..

Answer / naresh chandra jha

to check that mmf is in additive polarity or subtractive ,
polarity polarity test is important because in case of
additive polarity (primary mmf and secondary mmf in same
direction direction ) insulation may get damage .

Is This Answer Correct ?

10 Yes

8 No

Post New Answer

More Electrical Engineering Interview Questions

How REF protects transformer alone? explain with diagram.

0 Answers

what is the abbreviation for F.M In FM-200 fire suppression system

1 Answers

what is a tri vector meter? what are the tri vectors?

2 Answers

Which state of India had first started power reforms?

1 Answers

WHAT IS THE FULL FORM OF ONAN ( TYPE OF COLLING IN TRANSFORMER)

7 Answers

Why positive terminal of DC 48V was earthed?

1 Answers

Sir 33kva 2 transformer load 900 amp calc 1800 amp mana jayega

0 Answers Classic Infotech,

FRIENDS, I am doing DEEE (part time)final year. Give me some ideas for project

5 Answers HCL,

what is the speed of current

4 Answers

can any one help me out by posting something related to rvnl interview for site engineer electrical.? what is the procedure? what kinda question they ask us? how long the interview goes? and any tips? and any thing you want to share?

1 Answers RVNL,

What is magneto on a gas generator. how it functions. its out put is d.c or a.c. how it can be checked for correct functioning

0 Answers

How the electric train gets the supply of electricity? What is the return path of the current?

8 Answers Siemens,

For more Electrical Engineering Interview Questions Click Here