Answer / dhiraj banka

Class b SPD is for lightning surges & class c SPD is for switching surges.Class B+C protects both from lightning & switching surges.

Answer / vanraj

For surge arrester (lighting arrester) class defines the
capacity of energy can dissipate by SA.

Class in generally not defined by B & C but it defined a
class 2 , Class 3 , Class 4 & class 5 for sub stations.

For 145 kv (110,132 kv ) class 2
For 400 kv ( 400 kv) class 3
For 540 kv (generally not use in india) class 4
For 765 kv Class 5

Why we generate power at multiple of 11 i.e 11kv,33kv etc.

9 Answers   DTV Solutions, Havells, TCS,

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what is the purpose of supervision relay coil

1 Answers  

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Why short ckt does not happen when solenoid coil connected to supply. as its a wire only.

1 Answers   Siemens,

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what is the generating transformer?

3 Answers  

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what is scan time of PLC & in which factor scan time is decide

3 Answers   EEEC,

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what is the difference between elcb,rccb,mcb.

8 Answers   HCL, RCCB,

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Why high voltage lines (overhead ) are called high tension lines?

8 Answers  

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What is Earth Fault and Over current Fault.

1 Answers  

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how can i select the cable ratings

4 Answers  

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what is meant by fuzzy logic? what is fuzzification and defuzzification?

5 Answers   MEIL, Power Grid,

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Myself completed B.Tech ECE in private university but i am working as an testing and commissioning engineer in electrical field whether i am eligibility to apply electrical licence.

1 Answers  

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why it is mentioned as 8/10 mva transformer why not directly 8mva or 10mva transformer. please explain me the full detailed reason.

4 Answers   Qatar Gas,

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