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while buying 30 kva on line ups for 1 phase ouput, we ave to calculate the number of batteries for 2 hours back up? how to calculate the ah rating and number of batteries
1 3960What is Surge Capacitor? Why it is require in Generator Circuit Breaker,inspite of surge arrester?
3088in our all power plant have connected in grid and grid voltage and plant voltage is same, but as per as electrical concept the power will transmit from high potential to low potential but here altough same,then how power transmit from power plant to grid.
2298which one is more costly:single phase induction motor or 3 phase induction motor??give proper reasons..
1 3515Due to ferranti effect which power increases at the receiving end?active power or reactive power?
5 9224i have dry type transformers can you help me that how many tests i can do to know the performence of transformer and also please tell me about the BDV test and Insulation resistance test in oil cooled transformers
4 8943Why 3 over-current and 1 earth fault relay is used on primary side of transformer? Why 2 over-current and 1 earth fault relay in used on secondary side of transformer?
1 8591hi, i have 3x200KVA and 2 x 80KVA UPS with battery bank of 150AH 68Nos. and 100AH 204Nos., i need to install AC either ductable or PAC type, so can you help me to calculate heat load and capacity of the AC to install.
2696Post New Electrical Engineering Questions
Advantages/Disadvantages of earthing of neutral bus on MSB instead of separate neutral earthing for transformer/DG sets feeding to MSB
Please brief me about number of pole in alternator.In single phase alternator coils are connected in star or series. How to calculate frequency for the same.
what is the prosses for getting of 33kv licence (i have completed my engineering degree & working in 33kv substation for contract basis )????
if we have a industrial load of 400 kilowatts with 415 volt AC then how much total harmonic distortion (thd%) should be acceptable for steady power system.
What is the difference between diode and a transistor in terms of the direction of current flow?
give single line diagram of D.G distribution form alternator to main L.T panel?
Grid fault level [KA]?
how can service sitting be setted for MCCB?Example for sittings IR (CURRENT RATING),IS(CURRENT STARTING) I O (current operating)?
IN MY SYSTEM THERE IS ONLY OVER CURRENT EARTH FAULT RELAY IS AVAILABLE. FOR THE UNBALANCE SENSING IS THERE ANY RELAY IS AVAILABLE? THE SAME CTs WHICH ARE USED FOR THE OVER CURRENT EARTH FAULT RELAY CAN USE FOR UNBALANCE ALSO?
what is different between phase and netural
how can motor both beasrings insulation resistance can be check?
HOW TO CALCULATE CAPACITOR BANK OR HARMONIC FILTER CALCULATION
What is purpose of reactor?.What is different between line and bus reactor?
how dia of wire and angles are calculated for overhead shielding wire to protect substation equipment from lightening strokes???
what is the minimum (Common factor) insulatin resistance of the following a, 4mm sq wire b, cable from 50 mm sq to 800mm sq
