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what is the difference between Ith & Iu rating in MCCB. Particularly on SACE ABB Circuit Breaker?
2 18541I 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?
1 2404What is the difference between sensitive earth fault and restricted earth fault in power transformers?
4 53092what is the reason for drop in freq. from 50 hz at generating side to 49.8 ,49.6 etc.at receiving side???
2 4694how the rotating magnetic fieldis produced in induction machines??? give the correct explanation.is there any mathematical expression for the same?
1 3192If 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 17398Post New Electrical Engineering Questions
pls,send the previous year written test questions.
Can you used moeller lzm1 mccb in a dc system with 125vdc and 20ka short circuit current , beside is it have 24 or 48 volt shunt ? Beside how long current can through from An MCB shunt contacts? (like Z7-AS 24 V)?
what is the condition for YnD11
TO CALCULATE THE RESISTANCE OF GRR OF HT MOTOR 400KW WHEREAS STATOR VOLTAGE 6.6KV AND ROTOR VOLTAGE 705V AND ROTOR CURRENT IS 346A.
Q.1:What protection will be used on HT and LT side of 33/0.4 KV, MVA transformer. Indicate capacities of protective device to be used. Q.2:Which types of back-up protections are used in the power transformers? What do you understand by the term over travel in the relay? Q.3:How star and delta connected winding transformer are provided from earth fault
What will happened if the neutral of the (star connected secondry) Xformer disconnected? (if its Above KVA rated one)
Why squirrel cage motor can only use with low starting loads ?
please send the IS strandard for electrical to sakthi_murugan86@yahoo.co.in
sir i want previous entrance exam papers for written test
What was your role in the silicon evaluation/product ramp? What tools did you use?
How much minimum insulation required between 11kv/3.3kv transformer windings?
What are the different methodes for calculating the short circuit Current?
In a Impedance Based Distance Relay (Quad Characteristics) - Could there be two different Line Angle(RCA) for Ph-Ph & Ph-Gnd? If So Kindly Let me Know.. Where, What are the advantages of the same?
CBCT selection
Please sent me some previous year question papers of BSNL-JTO telecom and RRB in ELectrical Engineering to varshashahi@yahoo.com
