what is the workimg of ct &pt?

Answer Posted / a.ramachandran

current transformer : transformation of high current into
required current rating of measuring instruments and
protection relays.

Potential transformer: step down the high voltage into low
voltage for the purpose of measuring instruments and
protection relays.

Is This Answer Correct ?    12 Yes 1 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

can anybody send the rrb chennai &rrb bopal question papers of 2006&2007.My exam is on 12 oct 2008.Its urgent

1635


how power trnafor from 1 point to another point in bus bar ya transmission line( voltage trnasfer from 1 point to another poin)

1490


Why is ignitor used in sodium vapour lamp

2904


Show Details FROM:Muhammed Ikram TO:qa@allinterview.com Message flagged Saturday, June 4, 2011 10:07 PMMessage bodyHello all, i want to ask a question to all of you that what is VMM (voltage monitoring module )? how it work,s? i heard somewhere that it compare 1 phase voltage to other phase voltage. but there is also some setting on it. how to set it,s setting. please tell me briefly. Thank,s and Regard,s. Muhammed Ikram.

1408


What is sensitivity of a measurement?

696






How i can calculate current of cable according to ares?

1416


what is a composite error in current transformers, why occurs & in which it will occur i.e, either metering ct/ protection ct

1297


What is evaporator & condencer & compressor

1730


What will be the impact on motor performance if a LT motor is rewound with changed motor winding data as given below:- Original winding data: total 04 wires = 02 wires of 17 SWG + 02 wires of 16.5 SWG. Changed Winding data: total 03 wires of 15.5 SWG wire size Motor rating: 160KW, 740RPM, 415V, ID FAN application. Normal Running Current = 95% of FL Current.

1580


Assuming that a dedicated neutral earthing transformer is provided for each GT generator, when the two generators are running in parallel, has consideration been given that the earth fault current from one generator stator winding be split between the two neutral earthing transformers? If so, what adverse impact will this have on the operation of the 59N and 27TN devices?

1230


What information we need to prepare relay coordination chart

1844


What is load boxes ?

1590


how to calculate distance between busbar supporters for LT panel, what are the factors influencing in this design

4704


What aturn on methods of scr?

703


Why the dc voltage drop during starting of emergency lube oil pump? The Voltage drop from 135kv to 125 kv for one min. before re-establish to 135kv?

1792