A lossless transmission line with 0.2 pu reactance per phase uniformly distributed along the length of the line, connecting a generator bus to a load bus, is protected up to 80 % of its length by a distance relay placed at the generator bus. The generator terminal voltage is 1 pu. There is no generation at the load bus. The threshold pu current for operation of the distance relay for a solid three phase-to-ground fault on the transmission line is closest to:

A three-phase 50Hz, 400kV transmission line is 300 km long. The line inductance is 1mH/phase and capacitance 0.01µF/km per phase. The line is under open circuit condition at receiving end and energized with 400kV at sending end, the receiving end line voltage is KV (round off to two decimal places) will be ______

At no load condition, a 3-phase, 50Hz, losses power transmission line has sending-end and receiving-end voltages of 400kV and 420kV respectively. Assuming the velocity of travelling wave to be the velocity of light, the length of the line, in km, is______________.

Consider a step voltage wave of magnitude 1pu travelling along a lossless transmission line that terminates in a reactor. The voltage magnitude across the reactor at the instant the travelling wave reaches the reactor is

An extra high voltage transmission line of length 300 km can be approximated by a lossless line having propagation constant β=0.00127 radians per km. Then the percentage ratio of line length to wavelength will be given by

The total reactance and total susceptance of a lossless overhead EHV line, operating at 50 Hz. are given by 0.045pu and 1.2pu respectively. If the velocity of wave propagation is , then the approximate length of the line is

An 800 kV transmission line has a maximum power transfer capacity P, on the operated at 400 kV with the series reactance unchanged, the new maximum power transfer capacity is approximately

An 800 kV transmission line is having per phase line inductance of 1.1mH/km and per phase line capacitance of 11.68nF/km. Ignoring the length of the line, its ideal power transfer capability in MW is

A long lossless transmission line has a unity power factor (UPF) load at the receiving end and an ac voltage source at the sending end (Figure). The parameters of the transmission line are as follows:

Characteristic impedance , propagation constant , and length. The equation relating sending and receiving end questions is

Compute the maximum power that can be transferred to the UPF load at the receiving end if .

A 275kV, 3-phase, 50 Hz, 400km lossless line has following parameters:         

, line charging susceptance  micro-Siemens/km

(a) Calculate the receiving end voltage on open circuit using justifiable assumptions.

(b) What load at the receiving end will result in a flat voltage profile on the line?

(c) If the flat voltage profile is to be achieved at 1.2 times the loading in (b), what will be the nature and quantum of uniformly distributed compensation required

The load carrying capability of a long AC transmission line is:

The reflection coefficient for the transmission line shown in fig. at P is:

A cable has the following characteristics. .                 

The velocity of wave propagation through the cable is:

The velocity of propagation of electromagnetic wave on an underground cable with relative permittivity of 3 will be __________

For a 500Hz frequency excitation, a 50km long power line will be modeled as

The surge impedance of a 400 km long overhead transmission line is 400 ohms. For a 200 km length of the same line, the surge impedance will be: