in 11kv/400v transformer when only one phase of 11kv supply
fails what happens to sec voltage and why
Answers were Sorted based on User's Feedback
Answer / sunit
from my point of view what i have seen physically .. if one phase of the 11kv line is faulty or jumper in transmission lines burnt out then there will be a low voltage in the secondary side of transformer,
actually DTR breaker in control room needs to trip the circuit but if the relay time settings are not accurate then it won't trip the circuit rather show low voltage in the secondary side...
Is This Answer Correct ? | 2 Yes | 0 No |
If delta/star ,one phase voltage will be normal and the
other two 50%, If star/star two phases normal and the third
missing
Is This Answer Correct ? | 5 Yes | 4 No |
Answer / b.janardhana rao
I seen physically. One phase of 3 phases failure in HT. I said Example it will shows like RY - 415, YB-415, BR - 230Volts in seconary side. In that time two phases what loads are there is working. Remaining phase is not working. So 3 phase loads like pums, motors are not working. So we can put in ACB phase failure relay to be used. In that case the ACB breaker wads tripped.
Is This Answer Correct ? | 1 Yes | 1 No |
Answer / suresh
HT side one phase fails means secondary side unbalance voltages coming ,that means upstream side breaker will trip within time limit.
Is This Answer Correct ? | 0 Yes | 2 No |
11kv/415v T/F is designed for 3 phese supply , if 1 phase
fails then t/f will trip automaticly and no voltage will be
avaliavle at secondary side.
Is This Answer Correct ? | 11 Yes | 17 No |
Answer / m.prasath
Here,
Primary voltage is 11kv.
Secondary voltage is 400v.
If primary voltage is failed means nothing will happen in secondary side. ie almost zero in secondary side in transformer....
Is This Answer Correct ? | 6 Yes | 12 No |
one 60KVA UPS how can full load current tell me us formulas
Can any one help me how to set an overload set the range from 2.8A to 4A , rated motor current 22A, CT 60/5A
Dear sir, we are getting voltage fluctuations suddenly for 2 or 3 minutes again it becomes normal. we checked each and every connection some times we are getting 110 volts like that from earth to neutral again it is reducing we are getting supply from 45 kva DG set give earthing properly.
For 132 KV line, PT or CVT which is prefered for measuring & protection? is there any IS or IEE standard available?
what happen if the battery is charged by more than one source ,for ex: connecting data cable to laptop & charger pin to source supply ?
How Much Capacity of Diesel Genset is suitable for 20 no.s of 1.5ton AC's & Why?(Load Calculation)
11 Answers Lapis Technologies,
(1)For 3 No 1500 KVA transformer require on one single bus bar or need to be section through bus coupler means upto 3MVA.(2) 22KV Net work system as ring, How maney I/C required or 0ne I/C and one O/G.(3) What should be rating of VCB for 22 KV line.(4)Electrical/mechanical inter lock, why we need.
When neutral is grounded in electrical circuit?
pls define kvarh
The rating of Transformer are 11KV, 22KV, 33KV instead of 10KV, 20KV & 30KV?
What is Difference Between static & Dynamic Pressure of Fan & Blowers
What is a soft start?