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what is the difference between Ith & Iu rating in MCCB. Particularly on SACE ABB Circuit Breaker?
2 18311I have an existing old MCCB. ABB Model SACE, the rating are: Ue = 660 volts, Iu =1250 Amps, 3 poles, Ith (max) =800 amps at 45 deg C. I need a circuit breaker for my 3 phase motors, 380 volts 60 hz. the supplier required the minimum ampacity of the breaker to be 911 amps. can i use this breaker with rating of Iu =1250 amps but Ith = 800amps maximum?
2314What is the difference between sensitive earth fault and restricted earth fault in power transformers?
4 52799what is the reason for drop in freq. from 50 hz at generating side to 49.8 ,49.6 etc.at receiving side???
2 4544how the rotating magnetic fieldis produced in induction machines??? give the correct explanation.is there any mathematical expression for the same?
1 3078If DC supply is given to a transformer it may a) Work b)Not Work c)Give lower voltage than the rated voltage on secondary side. d)burn the winding
12 16793Post New Electrical Engineering Questions
what is PID control in VFD drives?
in general it is observed in power stations, the tertiary winding is used in higher rating Y-Y auto transformer but not in Y-Y power transformer. is the tertiary winding is compulsory then why it is not using in power transformerÂ
how u select control transformer for a mccb panels or any panels?for expample we hav 440 volts maim supply and control volts is 230v?
How dia computation perfomed in cold rolling mills .
In a flange coupling, the flange bolts are designed for
Explain using drawings what is reverse PID action w.r.t PID controllers.
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?
why generator efficiency is more in swinburnes test?
state types of reflectors in illumination engg. ???????
1.What is captive power plant? 2.What is national grid?Give brief idea.
If short circuit ratio is high is it bad or good for a machine then tell the reason...
What is the meaning of loop in transformer
What fomula is used to calculate: 1. rated frequency withstand voltage, and 2. rated lightning impulse withstand voltage.
what is the breaking capacity and making capacity of circuit breaker and how
What cmos is and its benefits?
