Earthing / Grounding : Hot Zone Contour covers residential properties
Earthing / Grounding : Hot Zone Contour covers residential properties
(OP)
I am currently facing some problems designing the earthing of a HV substation. Although I have experience designing earthing on several other projects in rural areas this is the first one that I have encountered in an urban area.
The site suffers from incredibly high soil resistivity and the hot zone contour covers several residential properties.
I am uncertain as to what precautions need to be taken at the properties covered by the hot zone. I am aware that work will most likely be required on the phone lines to the house but I am uncertain about the water pipes and power supply.
My concern is that potential will be transferred to other properties oust side the zone of influence either through metal water pipes or through the earth / neutral conductor of the power supply.
Precautions such as inserting insulating sections to pipes leaving the properties and altering their earthing systems seems rather costly to me. Personally I find it hard to believe that such precautions are necessary as I know of hot substations in the center of cities where such precautions would have an astronomical cost attached.
I have found it very hard to discover any information on this either in the standards or in text books. Does anyone have any experience with this problem? What precautions would be necessary? I would be really grateful for some advice as this project is becoming quite urgent.
Many thanks
The site suffers from incredibly high soil resistivity and the hot zone contour covers several residential properties.
I am uncertain as to what precautions need to be taken at the properties covered by the hot zone. I am aware that work will most likely be required on the phone lines to the house but I am uncertain about the water pipes and power supply.
My concern is that potential will be transferred to other properties oust side the zone of influence either through metal water pipes or through the earth / neutral conductor of the power supply.
Precautions such as inserting insulating sections to pipes leaving the properties and altering their earthing systems seems rather costly to me. Personally I find it hard to believe that such precautions are necessary as I know of hot substations in the center of cities where such precautions would have an astronomical cost attached.
I have found it very hard to discover any information on this either in the standards or in text books. Does anyone have any experience with this problem? What precautions would be necessary? I would be really grateful for some advice as this project is becoming quite urgent.
Many thanks






RE: Earthing / Grounding : Hot Zone Contour covers residential properties
RE: Earthing / Grounding : Hot Zone Contour covers residential properties
" SAFETY ISSUES RELATED TO THE CONNECTION OF MV AND HV GROUNDING SYSTEMS OUTSIDE SUBSTATIONS. Y. Rajotte. J. Fortin. G. Lessard. "
I will soon be working on a project with a similar issue and plan to use WinIGS software for analysis.
Using Google Earth one can find many substations in both rural and metropolitan areas with adjacent residences.
The ones with swimming pools really makes one wonder.
http://www.sptimes.com/2004/08/24/news_pf/Northpin...
So you are right to be concerned about the issue since the use of adjacent properties is not under your control.
RE: Earthing / Grounding : Hot Zone Contour covers residential properties
Try "EARTH POTENTIAL RISE INFLUENCE NEAR HV SUBSTATIONS IN RURAL AREAS" Authors: Rajotte De Sève Fortin Lehoux Simard
and
"A TOUCH VOLTAGE MEASUREMENT METHOD APPLICABLE ON ENERGIZED MV AND LV LINES" Authors: Rajotte Fortin Cyr
The authors are with Hydro-Québec
RE: Earthing / Grounding : Hot Zone Contour covers residential properties
In some case it can help you especially if you are in a case of cable instead line for the incomer.