| The Breakroom > The Water Cooler |
| Too Many Volts |
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| awemawson:
So I thought it'd be interesting to see the over night results from the UPS voltage recordings: First picture as it was one night in July - significant over volts in the small hours Second picture - last night - far more healthy |
| vintageandclassicrepairs:
Hi Andrew, Good to hear you have a resolution to the issue, My house is supplied from a tranformer which used to be pole mounted near the road boundary in my garden We had problems back then with short bulb life as we were nearest the trafo and it suppleid houses up to half a mile away, When the networks were upgraded and a 3 phase transformer installed I got them to move it into the field outside my garden, so things look a little better The supply is now more stable. I'm still puzzled by the way your transformer is supplied? Here in Ireland every rural transformer is fed through fused links and usually there are arc suppression coils as well The fused links have a fusible element that is attached in tension holding the latch on the disconnect link if the fuse blows the link drops open, This visual is very useful when fault finding at night Remembering this, it seems a long time ago now, I left networks in 85 and moved to the power station Cheers John |
| lordedmond:
John It's not unusual with older instalations , I bet it was the only transformer on the line and they tagged on the extension Hv line , with the LV side they are Evan more caviller they usually have very little protection . In fact older style switch gear for Hv they had a six second handle so you could not open the breaker for six seconds ,by that time if there was a fault it would trip upstream , for those that do not know it was a hinged leaver that you took off and turned round to open the switch to OFf glad I do not play with it nowadays Stuart |
| awemawson:
i suspect Stuart is right here. I have seen photograph from the mid 1930's showing an HV 3 phase line in that position, but without the underground cable down the pole. It must have been replaced at some time in the 50's with the current one, as when we dug out for the slab for the green houses we unearthed the stumps of the original poles and the 1/4" thick solid copper earth plane :ddb: |
| johnbaz:
Since I saw a poor fella cooked to overdone on top of a train in India (On youtube), The very thought of all the volts and megga amps chill me to the bone for anyone working on the lines :bugeye: I'm happy to have it all normal here in the city!! John :beer: |
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