AC Single Core Armour Grounding
AC Single Core Armour Grounding
(OP)
We are working on AC Single core armoured cable, system voltage 34.5 KV. The armour earthing shall be done on both sides or single side?. I have read that connecting the armour to earth on both the sides will lead to flow of circulatng current & will increase the heat in the cables. The cable length in our case is 450 meters.
Also if single side which side is poreferrable supply point or source point.
Thanks in advance.
Also if single side which side is poreferrable supply point or source point.
Thanks in advance.






RE: AC Single Core Armour Grounding
Search the forums for keywords Cross Bonding, Sheath current, etc. There are quite a few posts on this topic.
Earthing the armour at both ends will induce a circulating current in the armour and the related losses and derating of the cable.
Earthing at one end will eliminate the currents but induce a voltage at the un earthed end. If this voltage is calculated to be acceptable then single point earthing is acceptable.
Thanks,
Andrew
RE: AC Single Core Armour Grounding
Alan
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"It's always fun to do the impossible." - Walt Disney
RE: AC Single Core Armour Grounding
RE: AC Single Core Armour Grounding
Regards
Marmite