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We're having the complete substation checked. The transformer is about 35 years old and the only thing that has ever been done is removal of spiders webs and connections tightened.

Hi, Thanks for all the comments, seems everybody would like an explosion. The higher voltage 260V on L2 seems to have been present for at least 6 months. The electricity supplier says primary voltage is OK 10KV. The engineer from the electricity board reckoned that sometimes transformers do...

Hi everybody, After installing modern lighting, in a school, the lamps flickered all the time, I measured the voltages: L1=230V, L2=260V, L3=230V Load is basically evenly distributed over the phases. In the Substation the transformer occasionally makes a bubbling sound suggesting gases rising in...