what is formula in determining the size of Circuit Breaker
for transformer with the following specifications. 7 units
of 1600 volts (primary) and 400 volts (secondary). Both
Primary and Secondary will have a circuit breaker which is
SF6. What should be the Switchgear Main Breaker Size anf
the sizes of each brances Circuit Breaker for Primary.
I've descovered that when the earth wire in a domestic electrical installation is not connected back to the board (ground) a voltage of between 9-24v is is found to be present in the earth wire. When connected at the board there is no voltage - is this normal and why does it happen?
Why are use 22 kv 3ph supply ?
which protection function should measure RMS value of current&DFT value of current?
How short circuit MVA(Fault MVA) in a power system calculated for calculating number of earth plates ?
A current of 2A flows for 10 hour through a 100 ohm resistor. The energy consumed by the resistor is:(a) 0.5 kWh(b) 4 kWh(c) 2 kWh(d) 0.02 kWh
If we are importing real power & exporting reactive power then what will be the effect on our system
What is the simplest formula to calculate the rotor diameter of a synchronous generator?
how generator generates electricity?
what is the mechanical safety of DG ?
a 3 phase motor was running with delta connected, suddenly one phase winding got burnt off, what will be the effect ?
what is difference between mccb,mcb,elcb,pccb
Why charcoal and salt add in earthing pit.
6 Answers Garware, NTPC, Sterling Wilson,