Reactive power control

an overhead line with the series compensation is protected using

• Impedance relay

• Reactance relay

• Mho relay

• None of anyone

Shunt compensation in an EHV is resorted to

• Improve the stability

• Reduce the fault level

• Improve the voltage profile

• As a substitute for synchronous phase modifier

for stability and economic reasons, we operate the transmission line with power angle in the range

• 10 degree to 25 degree

• 30 degree to 45 degree

• 60 degree to 75 degree

• 65 degree to 80 degree

Series compensation on EHV lines is resorted to

• Improve the stability

• Reduce the fault level

• Improve the voltage profile

• As a substitute for synchronous phase modifier

The voltage of a particular bus can be controlled by controlling the

• Phase angle

• Reactive power of the bus

• Active power of the bus

• Phase angle and reactive power

With the help of a reactive compensator it is possible to have

• Constant voltage operation only

• Unity pf operation only

• Both constant voltage and unity pf

• Either constant voltage or unity pf

For a long uncompensated line the limit to the line loading is governed by

• Thermal limit

• Voltage limit

• Stability limit

• Corona loss

With 100% series compensation of lines

• The circuit is series resonant at power frequency

• Low transient voltage

• High transient voltage

• Both the circuit is series resonant at power frequency and high transient current

The effect of increasing getting angle in a thyristorised controlled reactor is

• To increase the effective inductance of the reactor

• To reduce the effective reactive power

• Both answer option

• None of any

The effect of increasing gating angle in a Thyristorised controlled reactor is

• To decrease power loss in thyristor controller

• To decrease power loss in the reactor

• To make current wave form less sinusoidal

• All option are answer