What is C.T, why it is used and what care should be taken
for that while connecting?
Answer Posted / vishvesh
normally in high voltage line is it not possible to measure
current directly by any instrument for measuring of
protection purpose. CT (current transformer) as the name
suggest step down the value of current to very nominal
stage so that normal instrument can get reading from it.
and with progressive ratio calibration. we can get actual
value of current flowing through the line. also the relays
for the protection are connected with secondary of CT.
Is This Answer Correct ? | 1 Yes | 0 No |
Post New Answer View All Answers
what is meant by directional earth fault and non directional earth fault? describe both.
What is the effect on 3phase induction motor if current setting knob of DOL kept at minimum current?
what & how to check the lightning arrester
for 100 HP Induction motor service factor is 1.2(SF) we placed a VFD at the motor side load is balance with 0.3 Amp's Phase to Phase but at incoming of VFD load is un-balance with 10 to 20 Amp's what will be cause of load un balance
What will happen if the d.c. Shunt motor opened accidentally running on no-load has its shunt field winding?
Explain difference between stand by earth fault and residual earth fault protection?
What is the difference between electronic regulator and ordinary rheostat regulator for fans?
Hi Suppose we have a wye/wye transformer which is grounded at both sides,in this situation, do we have ay ground transformer? in other words, ground transformer can do any thing more (while we have nuetral wire in both sides)? As the last question, what about 3rd harmonic? we have two choices: first using wye/delta transformer + ground transformer and second using wye/wye earthed connection.in the former choice, we dont have 3rd harmoonic at the secondary side but what about Yn/yn conection? do we suffer from 3rd harmonic in the Yn/yn connection?
what is deffrence between squirral cage and wound rotor in IM?
How to operate a ac chilar plant?
How to do cable earhing? whether by grounding Armour to ground or by running extra G.I wire along with cable? which one is preferred mostly amoung them? If the second one is more preferable how many GI wires to be run along with cable (1 or 2)?
what is x'mer ,isolation x'mer & yltra-isolation x'mer?????
could an induction motor be used for regenerative braking in electric-train control? in this type of application would some scheme have to be devised to obtain low synchronous speeds while braking? would induction-motor drive, therefore, be suitable for passenger service?
If UG power cable both ends are to be earthed or what? If not why?
We have a distribution transformer of 750KVA/11kv/440v and an AVR (Servo Stabilizer) of 750KVA on the LT side of distribution transformer. Also we have an ACB of 1200A on the output of distribution transformer (that is on the input of AVR). We want to have an MCCB on the output of AVR. What should be the rating?