Answer / minal

150/20 is the rating of voltages indicated on the surge
arrester.
It means that the surge arresters step down the high
voltage of 150 to 20.

Answer / ashish

I Am Not getting u r Question Actually The Surge Arrestor
For Medium & High Voltage Substation is as
Voltage Rating Of LA ( KV )= 0.8* LINE Volgage of the
Substation.

here 0.8 is earthing coefficent factor for solidely
grounded system.....

Answer / k.p.sharma

It's known as VARIASTER and 150 is supply voltage across it
we can connect and 20 is diameter in mm since Variaster is
in round in shape.

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