Earth Leakages on Medium Voltage cable 1

[David Adeola]

OUTGOING 11 KV EARTH cable has 65v leakage current what could have been the causes if all the R.M.U were checked and confirmed to be okay.

 

[che12345]

@ Mr David Adeola (Electrical)(OP)1 Oct 24 21:35
' OUTGOING 11 KV EARTH cable has 65v leakage current what could have been the causes if all the R.M.U were checked and confirmed to be okay'.
1. Sorry, I have difficulty to understand your question. Perhaps you would like to explain a) what is " outgoing 11 KV EARTH cable,
b) 65v leakage current,
c) R.M.U
2. You are welcome to come back with more detail.
Che Kuan Yau (Singapore)

 

[Hoxton123]

RMU = Ring Main Unit

 

[che12345]

@ Mr Hoxton123 (Electrical)2 Oct 24 16:35
' RMU = Ring Main Unit'
Thank you for your learned advice.
Can you kindly enlighten the relevance of RMU and what are the other items; 11KV EARTH cable and 65v leakage current.
Che Kuan Yau (Singapore)

 

[panter]

I can only guess 65 V on open delta at secondary of voltage transformers ..

 

[RRaghunath]

It could be the potential difference between the meter earth and the earth point for MV earth cable.

R Raghunath

 

[7anoter4]

I agree with Raghunat.
In my opinion also, the cable shields of three phases insulated cores was open-not earthed-at one end but earthed at the other end, and the 65V was measured between one shield and the Earth. In this case a capacitive voltage divider was created and the 65V was the part beyond the insulation. That means the core insulation is not damaged.