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How can you calculate in detail the VA burden of current
transformer used for Restricted earth fault protection?
Please understand that the CT required here is Class PX or
X. Also please show the calculations for knee point vtg,
stabilizing resistor, magnetising current.
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Answer Posted / william lobo
For PX class CTs , the burden is not normally mentioned .
There the CT is defiened based on the CT kneepoint
voltage , magnetising current etc . The burden is mentioned
in class P CTs
In PX class CTs the kneepoint voltage is normally based on
the max fault current and a diamensioning factor based on
system X/R ratio
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