Interested to Buy Any Domain ? << Click Here >> for more details...
Any one can explain if there is any harm from humming noise
heard from air circuit breaker : we have 415 switch board
having two incomers from transformers 3.3KV/415V , when bus
coupler closed, and open one ACB incomer to work in one of
the transformers, the current started hunting around 50
Amps, and heard humming noise from the air circuit breaker,
although the load current was only 1200 amps while the ACB
capacity is 2500 Amps, and the transformer 1600 KVA. The
same didn't happen when taken the other transformer offline.
Why this humming noise and current fluctuation? is there
any implication or danger, bearing in mind that we just
returned everything back to normal and stopped the
maintenance of the transformer. Shall we go ahead and
ignore this noise?
- 6 Answers
- 12652 Views
- I also Faced
- E-Mail Answers
Answer Posted / yusuf
Can you tell me what is the circuit Breaker settings like
overload,shortcircuit,ground fault & Instantaneous s/c
settings.Acc to your details max load that can be derived
from X'mer is 2228.56 amps & from 800 amps onwards Breaker
is creating this problem.So around from 25% load CB is
creaing problem also tell me about any release installed
(Closing,shunt,undervoltage).
| Is This Answer Correct ? | 0 Yes | 0 No |
Post New Answer View All Answers
working principle a.v.r. ?
how the phase convertor changes the no. of phases
Greeting to all members, How to calculate spill current when we have different ratio CT and Class for REF(Low Imp) I have 500/1A 5P20 @line side n 400/1A CL.X @ Neutral.
HOW TO CALCULATE HV CABLE SIZING?
The advantages of Magnetic flux leakage technique over Ultrasonic technique for non distructive testing of material.
how to revers the direction of single phase motor
Dear All we are having a problem in G120 BOP showing alarm A0503, F0052, F0060 we can not remove fault alarm ,Please any body help us. kowsar
our industries ht line so power fluctation(once drop of power please rectify causes
Why only sinusoidal ac voltages are generated?why not triangular or sawtooth?
What type of a DC motor would you use for a lift?
which cable is used for 15 Hp monoblock pump 3phase and service wire Distance is 210 feet please tell me cable size Armaured
which type of questions asking for solar companies?
describe the A.C. Generator Testing procedure
WHAT CAUSED THRESHOLD VOLTAGE TO EXIST?
what is the purpose of silicon dropper used in battery charger?
