why ct is testing using dc.. y cant we use AC insted of dc
on POLARITY TEST.
Answer Posted / raghavendran.r
I think for Polarity testing AC is being used in power transformers.Let me explain the circuit for the same .Keep the secondary side open.But short one of the terminals of the secondary side with the primary side, so that the primary current flows through the secondary.Now adjust the primary voltage using variac and note down the secondary voltage.If primary voltage is greater than secondary then the polarities are different.
If secondary voltage is more than primary then the polarities are same.
This is how polarity is tested in power transformers and Motors.
The same may apply to CT also.
Is This Answer Correct ? | 0 Yes | 1 No |
Post New Answer View All Answers
Why PS class CT is always preferred for Differential protection?
Why 15Amp. MCB is suitable to carry load of 1.5Ton Ac please Explain?
what is positive , negative & zero equivalent system resistance
Define what is the function of anti-pumping in circuit breaker?
How convergengr of nr method is not dependent on selection of slack bus and how gauss siedel method depends?
if there are six generators (3 gas CATT, one Jenbacher o1 MW each, and two nos Diesel 01 no 01 mw other 0.65mw EDGs ( say), 3 CAtt gas set have identical pole pitch,01mw EDG and Jenbacher gas Set have different pole pitch, how their power connection can be done to connect a common bus bar during installation. in short, how different pole pitched generators power connection can be done to connect a common busbar system through generators incomer ACBs.
HOW TO SELECT THE COPPER CABLE SIZES OF MOTORS,TRANSFORMERS?
my b-tech percentage is 50%. what answer will satisfy the hr ?
What is the requirement of grounding the neutral of single phase generators on load? If the neutral is not grounded, what will be the effect?
what are the pecularity of shaver sockets ?
A cable with concentric PE conductor must be used with frequency converter circuits what does its means.?
What is the height of DA, DAL, DB, DC & DDE tower?
plz tel me syllabus and exam date 4 jr executive engg (electrical)
how to calculate the magnetizing current of ct ( 800A/1A) for Relay 64
how to calculate voltage drop and followed by cable calculation?is there avail in formula?