substation Potential Transfer
substation Potential Transfer
(OP)
Hi, Guys,
Does anyone here have experience with Substation voltage transfer, from HV to LV side? We are working on 260KV-25KV Substation and we are trying to figure out the impact of HV design on LV side. Any inputs would be greatly appreciated.
Does anyone here have experience with Substation voltage transfer, from HV to LV side? We are working on 260KV-25KV Substation and we are trying to figure out the impact of HV design on LV side. Any inputs would be greatly appreciated.






RE: substation Potential Transfer
please be more specific.
RE: substation Potential Transfer
In my opinion, as per IEEE 80/2000 CH.17.9 Transferred potentials, you cannot mitigate the transferred potential but you can treat it by isolate it. For instance:
Communication circuits-use fiber optics , rails-using removable track sections where the rails leave the ground grid, and using insulating splices or flanges.
Piping-transferred potentials may be reduced or stopped at the substation boundary by inserting insulating sections of sufficient length to avoid shunting by the adjacent soil. There are manufacturers for these insulated sections.
Low-voltage neutral wire and shield or concentric conductor of medium voltage cables -it should be insulated from the substation ground system by insulation adequate to withstand the GPR; and it should be located so as to minimize the danger of being contacted by personnel.
RE: substation Potential Transfer
Are there any ways to quantity the transferred potential using specific software in order to come up with recommendations?
RE: substation Potential Transfer
For example :
A medium size power station presents 0.05 ohm grounding grid resistance and let’s say 63 kA short-circuit then GPR=3.15 kV. A remote substation GPR could be 5 kV. The build-up voltage for a 30 kV cable shield-if it will be well treated-see IEEE 575 for instance-could be neglected.
So a 8-8.5 kV could be a minimum transfer potential. However, the shield end will be insulated for 30 kV, of course.
RE: substation Potential Transfer
RE: substation Potential Transfer
The water pipes are isolated using insulated parts. The same as the rails.