Answer Posted / sobhuza, za
5A CTs are used beacuse they are cheaper than 1A Cts for
the same primary rating.I mean 600/1A CT is more expensive
than 600/5A CTs as more turns are in the former. 5A CTs
also imply that under full load conditions, 5A is flowing
between the CTs and the relays. Therefore there will be a
large volt-drop if the CTs are far away from the relays.
This is the reason why it 5A CTs are used for indoor
switchgear. Recall that the indoor switchgear houses the
relays as well so the CTs and the relays are closer to one
another. Therefore you will note that 5A CTs are not used
for outdoor CTs.
Is This Answer Correct ? | 2 Yes | 5 No |
Post New Answer View All Answers
How much load can be taken for chiller from 1500 kva transformer
how do prepare ongc exam.how is it question model.i am electrical. which part covering in electrical.tell me
what's the difference between 'shaft power demand' and 'BHP' , when we consider electrical load list.
What is core CT & it's function?
HOW WE CAN REDUCE THE CIRCUIT COMPLEX OF STAR-DELTA STARTER .BECAUSE NOW WE USING ONE TIMER RELAY & THREE CONTACTOR FOR MAIN,STAR & DELTA ?IF ANY IDEAS PLZ POST.THANK U
How to calculate Ith (I thermal) for curent transformer
I am getting above 60 V as open delta voltage against single phase unit ICT at tertiary delta formed and ICT getting trippped on NDR. ICT tested and found in order. PTs provided on tertiary are tested and in order. what may be the reason?
i have install 750 kva distribution transformer at my site and want to do neutral earthing. what calculations should i follow to determine earthing conductor material and size?
which IS or IEC is used for earthing,breakdown voltage of transformer oil, hv/pd testing and all type of electrical testing
Please send 110 kv sb station full single line drawing(sld)
What is the size of a 60 watt and 80 watt tubelight?
how to carried out tan delta test in 11 KV alternator ?
at work we have a 3 phase motor but on testing one phase isnt getting a reading. it runs 24 hours a day all week. stops and starts well no noise or heating. the phase isnt down to earth.is it just a bad meter reading or not? phases one and three came up with a resistance reading of 0.4 but phase 2 couldnt get anything shows up as open circuit.
ht side line to earth voltage
what is upper impedance and lower impedance of a distance relay