BARC EE : Power System Quiz-3

Corona can be reduced by

1. Decrease in conductor size.

2. Bundled conductors.

3. Using solid conductors.

4. Transposition of transmission line.

5. Decreasing supply frequency.

A relay is connected to a 400/5 current transformer and set for 120 %. The primary fault current is 1800 A need a plug setting multiplier of

For a transmission time at no load sending end voltage is 400 kV. It is no-load receiving end voltage is _______kV, provided A = D = 0.8.

If fault current in the relay coil is 10 times more then pick up current, then plug setting multiplier is

The certain operating condition, the reactive power supplied by a capacitor bank is Q_C. If the voltage is increased by 20% reactive power supplied by capacitor bank is:

Consider the following statements:

1. The positive and negative sequence components of voltage in a balanced 3-phase system are zero and only zero sequence component is present.

2. The zero sequence current flows only where neutral return path is available.

3. For a line to line fault, the sequence networks are connected in series.

Which of the following statements is/are correct?

If the loss angle of a cable is δ then the power factor is given by:

Fault in a power system is a

What is the type of falut ? If,

I_positive = j1.653 p.u.

I_negative = -j0.5° p.u.

I_zero = –j1.153 p.u.