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What will be the effect of in HT XLPE 220 KV
cable when one side of the Armour/cable ends are not
grounded. Will there is difference between 3-phase voltages?
like: if
A. Both End of Cable grounded Phase Voltages:- V1=219 KV,
v2=220 Kv, v3=220 KV.
B. One End is grounded other is not: than Impact on Phase
Voltages:- V1= KV, v2= Kv, v3= KV. Remain same or
unchanged??
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Answer Posted / k.prakashchandra
You have measured voltages with the help of PTs located near
the earthed cable ends . As there is a slight difference in
capacitances of the three cables to the Armour(probably due
to unequal lengths) and impedance of the PT is higher than
that of capacitance of the cable ,the neutral is decided by
the capacitances.There is no difference in actual voltages
but there will be a slight difference in measured voltages
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