Trefoil cable installation
Trefoil cable installation
(OP)
Could anyone advise why power cables are arranged in trefoil groups ?
I suspect it is to negate induced or circulating currents but are there any publications which deal with the subject ?
I suspect it is to negate induced or circulating currents but are there any publications which deal with the subject ?






RE: Trefoil cable installation
Gunnar Englund
www.gke.org
RE: Trefoil cable installation
1- Trefoil configuration produces less reactance than flat configuration. For instance, in three contiguous insulated conductors the trefoil reactance is around 25% lower than flat configuration.
2- Other configuration may require transposition to balance the voltage. However, since the trefoil arrangement has inherent balance mutual inductance will not create unbalance voltage.
3- The EMF in trefoil is minimum since most of them are cancelled each other in a three phase system.
RE: Trefoil cable installation