Many problems for the consumers are caused by tranformer stations which are built near to the houses and flats. These problems cause huge damage to the consumers and electricity providers as well.
The appearance of the transient over-voltage inreases the number of fault electrical devices, such as TV,PC,DVD-players and telecommunication sets.
The risk of damage is even worse if our appliances are connected to the low-voltage network and communication network in the same time (for example fax,modem,TV decoder..). The document gives information about the electrical background of this problem and also introduces some different measuring ways for examination of the earthing resistance in transformer stations. Besides, it touches on local measurements in middle/low voltage tranformer stations and it discusses how we can trust in this measurement for examination of the transfer potential.