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Top 16 Power System Interview Questions - powerplantguruji

 1.What deals power-system protection ?

Ans. Power-system protection is a branch of electrical power engineering that deals with the protection of electrical power systems.

2.A good electric power system should ensure that ?

Ans. A good electric power system should ensure the availability of electrical power without any interruption to every load connected to it.

3.Power protection systems limit ?

Ans. Power protection systems limit the damage at the fault location and prevents the effects of the fault spreading into the system.

4.What are the nature of faults ?

Ans. The nature of fault simply implies any abnormal condition which causes a reduction in the basic insulation strength between phase conductors, between phase conductor and earth or any earth screen surrounding the conductors.

5.Voltage breakdown due to ?

Ans. Voltage breakdown could be due to normal voltage or abnomal voltage.

6.Causes of faults could be due to ?

Ans. Causes of faults could be due to pollution, ageing effect or voltage surges.

7. Faults are divided into how many ?

Ans. Faults are divided into three verticals based on their type Current,Voltage and Frequency

8.What are the essential qualities of protection ?

Ans. Speed, Selectivity, Sensitivity, Reliability, Simplicity and Economy are the essential qualities of protection.

9.How many methods to discriminating faults ?

Ans. There are two methods of discriminating faults as per the location of the fault and as per the type of fault.

10.How many important components of protection ?

Ans. There are five important components of protection. 

They are: Current Transformer (CT), Voltage Transformers, Circuit Breaker (CB), Tripping and Auxiliary Supplies and Relays.

11.Functions of Current transformers ?

Ans. 

  1. Reduce power system current to lower value for measurement.
  2. Insulate secondary circuits from the primary.
  3. Permit the use of standard current ratings for secondary equipment.
12.How many types of CTs as per construction ?
Ans. There are two types of CTs as per construction Bar Type and Wound Type.

13.Which test is used to identify polarity of Current Transformer ?
Ans. Polarity of CTs plays a vital role. Flick test is used to identify polarity of Current Transformer.

14.Based on their operation CTs are divided into ?
Ans. Based on their operation CTs are divided into Protection CTs and Measurement CTs.

15.How many types of VTs ?
Ans. There are two basic types of VTs- Electromechanical VTs and Capacitor VTs.

16. What is circuit breaker ?
Ans. A circuit breaker is a switching device that interrupts the abnormal or fault current.

Must read related articles

What is circuit breaker and its function?

Voltage Transformer or Potential Transformer 

Power System Protection Part -2 

Power System Protection Part - 1 















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