what is the CT of protection and CT of metering ? what is
class 5P10 & 5P20 and class PS ?
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Answer Posted / kiran
CT for protection means for protecting other equipment in
the ckt. based on the protection class ex:5P10
5 - % of accuracy
P - for protection
10- 10% of rated current also it withstood
CT ratio 300/1A 10% of rated value means it can withstand
upto 3000A if any abnormal condition.
Normally for metering we use CL:1 , 0.5 ,0.2 because for
metering accurate value we need.
econamy purpose we won't use 1P10 or 0.5P10 and also
protection we don't want that much accuracy.
Class PS : based on knee point voltage we caliculate PS.
this is for special purpose.
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