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what are the major & minor faults that occur in an inverter and in UPS ? And how to repair and resolve them ?
230911KW Delta motor is taking about 44Amps in star and goes upto 70Amps in delta and trips OFF. The rated current is 26Amps. Application is for the blower. The motor takes ( no load without coupling impller ) only 2.5A and 5Amps in star & delta starter test.Need to know why its taking high current.
10 19670WHAT IS DIFFERENCE BETWEEN idmt and instentanous relay? is idmt is used as back up protection or else?or when instantenous relay saturates IDMT will operate???
1 11496what is threshold voltage for a relay???what does it exactly means ?whats its value in our indian transmission system say 11kv feeder RMU relay
3 13217if the back emf eqution for dc motor EB=(QPNZ/60A) THEN what is the value of A for PMDC MOTOR OR how can dicide the value of "A"
BSL,
2 5112Post New Electrical Engineering Questions
What mean by MLTP
Explain the operation carried out in thermal power stations?
What are the advantages of thermal power plant?
How many VSC based HVDC are there in India and the world
why the arc welding machines require parallel earthing systems? ie why each machines are connected to earth pit by separate wires during earthing? wats it adavantages?
My question is whether bellow formula is correct to find bus size for 46kA for 0.5 second & what is RT in bellow formula. formula to calculate the size of busbar to withstand the thermal stresses due to currents with duration of 0.2 sec to 5 sec. Sp = RT( I x I x t) / K Where Sp – is the cross sectional area of bus bar in millimeters. I - is the value of AC fault current. t - is the operating time of disconnecting device in seconds. K – is the factor depending on the material of the conductor, insulation and initial and final temperature. Value of ‘k’ for copper is 143.
How generating electric power export to grid from the generating station ?
what happen when power factor of 2 parallely operated transformer become equle?
what are the different methods for the starting of a synchronous motor.
how to select overload-relay for perticular motor 1.for D.O.L. starter 2. for Star-delta starter ????
why voltage form factor of PT are increase , when it is ecpected heigher spikes in system. how it is calculated.
What is transformation ratio what it describes?
what is the safty of poly phase tranformer?
if any body have question paper of railway (section engineering),then plz send me .i will thank of him/her.
why we have to particulary use ACB for below ratings,even available of MCB,MCCB with that range ?
