substation electrical interview question answer pdf

[vijay_madhav]

Substation Electrical Interview Questions - Answers
Substation Question and Answers:
What are the different substation components
Answer: Circuit Breakers, Disconnecting switches, Grounding switches, Current Transformers, Potential Transformers or Capacitor voltage Transformers, Line Traps, Lightning Arrestors, Power Transformers, Shunt Reactors, Current limiting reactors, Station Buses and Insulators, Grounding system, Series capacitors and shunt capacitors.
What are different types of busbar arrangement Schemes in Substations?
Answer: Different switching schemes or busbar arrangement scheme employed in switch-yard are:
Single Bus Scheme
Double bus single breaker scheme
Main and Transfer busbar scheme
Double bus single breaker scheme
Breaker and half scheme
Ring main bus scheme
Which type of bus arrangement is costlier and more reliable?
Answer: One and half breaker scheme is most reliable and costlier scheme. In one and half breaker scheme 3 circuit breakers are provided for 2 bus-bars. Hence the name is coined as One and half breaker scheme

For distribution network which type of Switching scheme is employed?
Answer: For distribution network Ring Main busbar scheme is employed. It has the provision that if power interruption occurs to one bus section due to maintenance or fault, power can be fed the bus from other side of the power system.

Factors on which material of station busbar depends?
Answer: Some of the factors on which station busbar depends are:
Current Carrying capacity
Short Circuit Stresses
Establishing minimum electrical clearances
What are the different electrical clearances in Substation?
Answer:
Ground Clearance: This is the minimum distance between any live conductor and the earth or ground.
Phase Clearance: It is the clearance between the different phases in a circuit or same phases in different circuits
Sectional Clearance: This is the minimum clearance between the live conductor and the limits of work, where spacial clearance is related to the safety of the operating personnel. The limits of work section may be ground or the platform on which the person is working.

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[ramya1490]

Substation Electrical Interview Questions - Answers

What are the different substation components
Answer: Circuit Breakers, Disconnecting switches, Grounding switches, Current Transformers, Potential Transformers or Capacitor voltage Transformers, Line Traps, Lightning Arrestors, Power Transformers, Shunt Reactors, Current limiting reactors, Station Buses and Insulators, Grounding system, Series capacitors and shunt capacitors.
What are different types of busbar arrangement Schemes in Substations?
Answer: Different switching schemes or busbar arrangement scheme employed in switch-yard are:
Single Bus Scheme
Double bus single breaker scheme
Main and Transfer busbar scheme
Double bus single breaker scheme
Breaker and half scheme
Ring main bus scheme
Which type of bus arrangement is costlier and more reliable?
Answer: One and half breaker scheme is most reliable and costlier scheme. In one and half breaker scheme 3 circuit breakers are provided for 2 bus-bars. Hence the name is coined as One and half breaker scheme

For distribution network which type of Switching scheme is employed?
Answer: For distribution network Ring Main busbar scheme is employed. It has the provision that if power interruption occurs to one bus section due to maintenance or fault, power can be fed the bus from other side of the power system.

Factors on which material of station busbar depends?
Answer: Some of the factors on which station busbar depends are:
Current Carrying capacity
Short Circuit Stresses
Establishing minimum electrical clearances
What are the different electrical clearances in Substation?
Answer:
Ground Clearance: This is the minimum distance between any live conductor and the earth or ground.
Phase Clearance: It is the clearance between the different phases in a circuit or same phases in different circuits
Sectional Clearance: This is the minimum clearance between the live conductor and the limits of work, where spacial clearance is related to the safety of the operating personnel. The limits of work section may be ground or the platform on which the person is working.