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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 3953What is Surge Capacitor? Why it is require in Generator Circuit Breaker,inspite of surge arrester?
3079in 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.
2292which one is more costly:single phase induction motor or 3 phase induction motor??give proper reasons..
1 3504Due to ferranti effect which power increases at the receiving end?active power or reactive power?
5 9188i 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 8926Why 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 8564hi, 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.
2691Post New Electrical Engineering Questions
which protection function should measure RMS value of current&DFT value of current?
On 400 amp factory load how kvarh capacitors provide
which IS or IEC is used for earthing,breakdown voltage of transformer oil, hv/pd testing and all type of electrical testing
How will you define capacitance?
What is the working principle of MIG welding? and its out put Voltage?
how net resistance islow in star connection and viseversa in delta connection...? if anybody could explain in detail it wud be helpful.
Explain what is use of lockout relay in ht voltage?
brief notes on ammeters
Please provided formula for calculate the cable size from step up transformer to M.V panel, run overhead aluminum cables, total load is 5mega watt, total length 900 feet.
Can anybody tell abt concrete encased earthing or grounding?
What happen if 200 KVAR capacitor connected to power continuesly?
What is meaning of out of phase (making & breaking) capacity And how to calculate
if a.c supply is given to the motor,, what happen?
how can decide the current rating of oltc
I need to connect a synchronous generator to the grid using automatic synchronization and two circuit breakers (one for synchronization, one for end connection to the grid), how to determinate the required diameter of the cables?
