Power System Transients

The Term Transients Refers to …………………

• a. Surge

• b.Spikes

• c.Fault

• d. Both a& b.

A transients occurs mostly frequently due to switching of…………….

• a.Resistive load

• b.Inductive load

• c.Capacitive load

• d. Both b or c.

In D.C circuit under steady state condition.the energy stored in the inductor and capacitor are …………..

• a.Zero

• b.High

• c.Constant

• d.Infinity.

The internal causes of transient is due to ………………

• a.Energized lines

• b.Tap changing Transformers

• c.Weather

• d.Loose connection

• e.Both a &b

During the direct stroke …………………….is induced in the transmission line.

• a. Severe voltage

• b.Impulsive overvoltage

• c.Induced overvoltage

• d.None of the above.

What are the types of Power System Transients……………………

• a. Single frequency

• b.Double frequency

• c.Initiation Transient

• d.Subsidence Transient

• e.All the above.

The outward manifestation of a sudden change in the circuit conditions,such as switch opens or close or fault occurs on a system is termed as……………….(2)

• a..Electrical Transients

• b.Mechanical Transients

• c.Power Transients

• d.Both a or c.

What is the importance of study of transients in planning ……………………….(2)

• a.System disturbance created in one location permeate throughout the System.

• b.Consequences of lightning

• c.The disturbances involves travelling waves.

• d.The sudden voltage reversal occur with travelling waves from switching surges.

• e.All the above.

What are the effects of transients in Transformer…………………….(2)

• a. dielectric component of coils get electrically stressed.

• b. voltage distribution along the coil is highly nonuniform

• c.dielectric failure between parts of the coil.

• d.All the above.

A deliberate connection of a resistance in parallel with the contact space (arc) is made to overcome the effect of ……………………voltage

• a.Transient Recovery

• b.Reverse Recovery

• c.Restriking

• d.None of the above.