ISRO Scientist or Engineer Electrical 2018
For the following questions answer them individually
Two buses in a system are maintained at the voltages $$V_1 = 1.25 \Box 30^\circ$$ and $$V_2 = 1.35 \Box 25^\circ$$. Bus 1 and Bus 2 are interconnected by a transmission line of impedance (1.3 + j 7) Ω. The power flow direction is
Inductance of transmission line for a length of 400 kms in unsymmetrical configuration are:
$$L_R = 30 mH$$ $$L_Y = 20 mH$$ $$L_B = 25 mH$$
What will be the inductance of each transmission line after transposing?
A short transmission line is having series impedance Z = 0.07 + j 0.12 p.u. If the transmission line is operating under full load at leading p.f, what will be the possible voltage regulation of transmission line?
Three networks are connected in cascade as shown below:
A B C D parameters of the system is:
$$\begin{bmatrix}A & B \\C & D \end{bmatrix} = \begin{bmatrix}2.0\angle-10^\circ & 5\angle 30^\circ \\1.0\angle-20^\circ & 4.0\angle 10^\circ \end{bmatrix}$$
What is the value of $$Z_2$$?
The surge impedance of 400 km long overhead transmission line is 300 Ω. For a 200 km length of the same transmission line surge impedance will be
In a power network, 380 kV is recorded at a 400 kV bus. A 60 MVAR, 400 kV shunt reactor is connected to the bus. What is the reactive power absorbed by the shunt reactor?
Insulation resistance of a cable of length 20 km is 2 MΩ. What will be the insulation resistance of the same cable but for a length of 200 km?
