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Discuss DNO transformer + switch missing HV earth in the UK Electrical Forum area at ElectriciansForums.net
The site has been subject to severe subsidance which may have damaged an earth mat, either way as it is the transformer that feeds a large school and some of the kids need hoists and so on, the impact of a earth fault could be very nasty...Probably the earthing has been stolen. I would say that missing earthing is fairly serious and should be fixed as soon as possible.
The HV earth connects the transformer and switch gear to the HV earth mat which is usually separate from the LV earth system. As well as providing a fault return path the HV earth normally has a mat shallowly buried in front of the switch gear so that when you are operating the switch gear your hands and feet are at the same potential in the event of a fault. The switch gear will also have earth switches which are closed to connect the cable cores to earth to make them safe to work on.
The site has been subject to severe subsidance which may have damaged an earth mat, either way as it is the transformer that feeds a large school and some of the kids need hoists and so on, the impact of a earth fault could be very nasty...
Reply to DNO transformer + switch missing HV earth in the UK Electrical Forum area at ElectriciansForums.net
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