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
- 13142 Views
- I also Faced
- E-Mail Answers
Answer Posted / yusuf
Yes,it can be.A very small gap can't seen by naked eyes
between CB main contacts could create this problem.Exactly
from which area this sound is comming? Is is some Clicking
sound/Buzzing sound.Can u give me Breaker details like make
(Siemens/L&T/ABB/Scneider) & Type no, 3pole/4 pole any
neutral earth fault protection provide extra to the
breaker,two breaker earthing & neutral connection.I am
talking of two main transformer breaker.Please furnish some
details to rectify the problem.
| Is This Answer Correct ? | 0 Yes | 0 No |
Post New Answer View All Answers
How to select a contactor? How many types of contactors are available
Is it possible to connect a safety device in to parallel?
please send me jindal previous aptitude and technical question and answer.my email id is deep_raj@live.com
Explain the difference between verilog task and verilog function?
Difference between shunt, PMG and AREP excitation. Which is the most reliable between PMG and AREP.
The sodium vapor lamp is not glows when it is connected a distance of 5 meters above from gearbox, why ?
how to design coil turns ?
How will change the frequency in distribution side?
why 1.7Uo for HV cable Hi pot test?IE standard why?
what is the method of earthing of a transformer using electrodes?
What is resolution of a measurement?
how much LT load can bear by the 100 KW HT connection.
As per the Anchor capstan motor specification, full load current is 200A. starting current is 1750 A and acceleration time is less than 8 seconds. Please guide for selection of cable size.
Can anyone tell me some hints about what type of questions are asked by the interviewer by an Electronics engineer when company is installing an IPP and wants a team of engineers?
why is the conservator tank painted white on the transformer
