When all the three phases are short circuited it gives rise to
A three-phase fault is a symmetrical fault.
The zero sequence reactance will be more than the positive sequence reactance, if the equipment is:
For transmission line
The sequence networks for a three-phase faults are connected in
A three-phase fault is a symmetrical fault where only positive sequence network (current exists).
Match List-l (Symbol for 3-phase transformer connections) with List-ll (Zero-sequence equivalent circuits) and select the correct answer using the codes given below the lists:
Using switch diagram, we find the zero sequence network for a transformer.
The base impedance and base voltage for a given power system are 10Ω and 400 V respectively. The base kVA and the base current will be respectively
The per-unit admittance YPu of a power system in terms of the base voltage Vbase and the base voltamperes (VA)base is given by
In a line to ground fault on a system, the fault current is 1500 A. The zero sequence current is
The fault current, in a double line to ground fault on a system depends on
There may be a zero sequence components in
1. line voltage of star circuit
2. phase voltage of star circuit
3. line current of delta circuit
4. phase current of delta circuit
Select the correct answer from the given options:
A 10 kVA, 400 V/200V single phase transformer with 10% impedance draws a steady short circuit line current of