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

if a single phase 3 hp submersible pump of Crompton Greaves is moving in reverse direction and sometimes it moves in rigth direction ,then what may be the cause....

2 Answers   Crompton Greaves,

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what is ratio test?

1 Answers  

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1. what is exciting winding, rotor winding, startor winding. and how it works? in ac generator

3 Answers  

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1 Answers   HSL,

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3 Answers   ABB,

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what is hysteresis loss?

4 Answers   PSU,

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what reactive how to maintain

0 Answers  

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0 Answers   TNEB Tamil Nadu Electricity Board,

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0 Answers  

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Three phase star connected PT transformer primary side one phase fuse is blown what will be the output in secondary side(Secondary side also three phase star connected)

2 Answers   Sun Pharma,

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what are the deffects for failure of PLC?

0 Answers  

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what is the resistance value of earthing pit and why they are connected?

6 Answers  

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