My emonCMS setup earned it’s keep over the weekend.
In the early hours of Saturday morning my UPS alarmed, which woke the dog, which woke my wife and ultimately me. When I logged onto to the Pi I found the 3 phases badly out of kilter, L1=285v, L2=172v, L3=285v.
So I called UKPower who quickly responded with an engineer at 4:45am, who checked my figures at the meter, rubbed his chin and said looks like an HV fuse has dropped at the substation, I’ll go down and pop it back in. 30 mins later he was back, substation was 100% fit, so pulled our master fuses and proceeded to investigate, only to find 3v differential between earth and neutral on the supply line. So had to leave us disconnected for safety, and called out the line guys.
10am two trucks arrived, one proceeded to get in the cherry picker to to check the overhead feed (the village is overhead, but with cable down the pole and underground for the last few metres to the meter). Found the problem the neutral line connector had failed due to water ingress.
Unfortunately because it was a neutral failure all four houses that are fed from that underground cable had to have their electrics checked by a 3rd party company before re-connection. Below is the graph showing the point of failure.
Big thumbs up