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Illogical but almost correct

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Illogical but almost correct

Old 13th Mar 2022, 17:39
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Illogical but almost correct

Today we suffered from a intermittent electricity supply. One moment it was working normally and then just as Mrs Rans6.... was on the phone renewing her car insurance it went off dropping the phone connection of the chordless landline. A short while later she received a text message saying it was restored and, on switching on a light, it was found to be working. Just for long enough to reheat our teas in the microwave before dropping out again. A while later it came back on but when we went to boil a kettle to make a fresh pot it was sort of working.... not with it's usual enthusiasm but sort of half heartedly. Similarly we found that some of our LED light bulbs were working but most of the lights were not. The microwave oven rotated the food but failed to cook it, ditto the second microwave oven. Very odd. I checked the fuse box and none of the trips had dropped.

Mrs Rans6..... then said "perhaps there isn't enough power for everyone so they are supplying a limited amount to each house". I can see why she thought that but still could not figure out what was going on. The broadband router had rebooted and was working normally, the laptop computer was back on the internet and my mains powered MSF receiver was still counting the seconds as usual. By then I was quite confused, some things working just fine, some things not working at all and some things half working.

So, I grabbed my multimeter and stuck the probes into a power socket and found that we were being supplied with a very steady 99 Volts AC. This was maintained even when I powered on a toaster in the adjacent socket of the twin outlet so it was not caused by a high resistance in the supply line to the house. I still have not figured out how this voltage could be supplied, I doubt that the supply infrastructure would be equiped with a 100 Volt option in place of the normal 230 Volts.

No doubt somebody will know how this can happen?

About an hour later the low voltage supply went off and then a few minutes later normal service resumed. One issue has come to light through this. Our central heating timer loses all of the programmed on and off times and the clock setting, This means that if we leave the central heating ticking over and keeping the frost at bay when we are away the whole lot gives up if there is a power outage. Time to get a better heating contoller fitted.

Rans6......
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Old 13th Mar 2022, 17:55
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I share your frustration with the heating system. We get a lot of randiom power cuts, usually for a few seconds but sometimes a bit longer. The boiler remembers the programming but loses track of time. A short cut will throw it off by 10 minutes or so, a longer cut is worse, but it seems to hold the date. Meanwhile, when we were off for 4 days recently, all the digital thermostats were within a couple of minutes when the power came back but the boiler has lost the time plot, although the programme was still good. I have discussed this with the man who comes from the manufacturer to service the boiler, hinting there may be a clock battery on a circuit board somewhere in the boiler that needs replacing. but if there is, he has never heard of it and the boiler is not that old.
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Old 13th Mar 2022, 18:32
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It's even worse if you are on three phase. Which we are.
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Old 13th Mar 2022, 18:41
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Mrs Mac complaining about same micro power cuts lasting maybe a second or so in Yorkshire. Not sure what is causing this but they have been cutting tres back near the over head power lines and indeed we have been told there will a power outage on Tuesday for 5hrs to allow further trimming to be done, so maybe to do with that.

Cheers
Mr Mac
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Old 13th Mar 2022, 19:11
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Whereas the house was fine the power supply dropped in the garage and the lights would dimly flicker and the 13A sockets would only power lo amperage items, if I tried to turn on a oil radiator it tripped out.
The sparky came and found it was 230v in comming to the garage but only 125v Available at the outlets.
Ultimately a replacement Consumer unit in the garage sorted it. We think the roof / walls were letting in moisture so a bit or resealing was needed
This was during the 2 storms we had a month or so back
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Old 13th Mar 2022, 19:12
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We are in North Yorkshire today. According to the Northern Power website the cuts we have had today are "unscheduled" and there are still folk without power now, due to be resolved by 10pm tonight.

Rans6..........
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Old 13th Mar 2022, 21:33
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Is the supply feed to your house is via 11kV overhead cable with a pole-mounted transformer near the property? If so, it's possible (although admittedly rather unlikely) that the tap changer in the transformer which responds to varying load current to keep your supply somewhere near the nominal 230V may have stuck or otherwise misbehaved.
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Old 13th Mar 2022, 23:02
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Originally Posted by Ninthace View Post
I share your frustration with the heating system. We get a lot of randiom power cuts, usually for a few seconds but sometimes a bit longer. The boiler remembers the programming but loses track of time. A short cut will throw it off by 10 minutes or so, a longer cut is worse, but it seems to hold the date. Meanwhile, when we were off for 4 days recently, all the digital thermostats were within a couple of minutes when the power came back but the boiler has lost the time plot, although the programme was still good. I have discussed this with the man who comes from the manufacturer to service the boiler, hinting there may be a clock battery on a circuit board somewhere in the boiler that needs replacing. but if there is, he has never heard of it and the boiler is not that old.
That seems like a strange system. Here in the States, typically, heating and cooling is controlled by a wall mount battery powered programmable thermostat (mine requires (2) AA batteries which last about five years). If the power goes out the furnace obviously can't run, but the thermostat doesn't lose time or programming and when power comes back on it picks up where it left off. I have to turn the thermostat to off before replacing batteries or programming will be lost.
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Old 13th Mar 2022, 23:34
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In my house, all downstairs rooms have programmable digital thermostats as each room has its own underfloor heating. When one trips, it sets the pump running to push water from that room through the boiler. The boiler detects the drop in temperature, measures the outside air temperature and then starts to heat the water to a predetermined temperature based on how cold it is outside.. The upstairs is conventional radiators controlled by a central thermostat and each rad has a thermostatic valve.
To confuse the issue, each room thermostat can be in individually programmed. The boiler can also be programmed separately. So long as the boiler is programmed to be available to cover the period the room stats are active, there is not an issue. Of course, if the boiler clock goes out of synch with the stat clocks, due to a power cut, then the room stats can be demanding heat but they wonít get any if the boiler clock says it is not time yet. It seems over complicated to me but it came with the house.
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Old 14th Mar 2022, 11:45
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Illogical but almost right... like the old "The oil price crisis doesn't affect me, because I only ever put £20 in".
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Old 14th Mar 2022, 15:06
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And everyone should run out, buy an electric vehicle, and plug them in to charge.
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Old 14th Mar 2022, 16:18
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Winemaker
Thank you. I wondered why I lost programming when I changed the batteries. Reprogramming was a right pain as it was an older unit and had to be reset for each day individually!

Our new one is simpler and easier to read but it's "off/on" temperature range is much larger. Means the furnace runs longer but less often, which is good, but gets colder between events which is bad and causes complaints from Mrs VJ.
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Old 14th Mar 2022, 16:34
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Originally Posted by IBMJunkman View Post
And everyone should run out, buy an electric vehicle, and plug them in to charge.
Good idea. Mine is fully charged already thanks. Although it is only a plug-in, right now I am feeling happy with it. I last filled the tank on 13 Dec 21 when I put in just over 21 litres. I will probably put in the same again sometime towards the end of the month when I will have done around 580 to 600 miles.
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Old 14th Mar 2022, 16:38
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Originally Posted by Ninthace View Post
Good idea. Mine is fully charged already thanks. Although it is only a plug-in, right now I am feeling happy with it. I last filled the tank on 13 Dec 21 when I put in just over 21 litres. I will probably put in the same again sometime towards the end of the month when I will have done around 580 to 600 miles.
Youíll cover 600 miles in 3 and a half months?
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Old 14th Mar 2022, 16:53
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Originally Posted by Avionker View Post
You’ll cover 600 miles in 3 and a half months?
It's been a wet winter and what with Covid and such there have not been many places to go. We internet shop for groceries and only go to town alternate weeks to collect the fresh vegetable order, the neighbour does the other weeks. When it is our turn to collect the veg, once every sixth week or so, we also pick up the meat order. We live in glorious countryside with plenty of walking on the doorstep, Dartmoor and Exmoor are close by. We have a pub in the village and two more within walking distance, the pizza van and the fish and chip van come every week. Often the car will stay in the garage between the fortnightly shopping trips. Perhaps once the weather picks up we will return to walking further afield.
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Old 14th Mar 2022, 16:58
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I only ask as Iím slightly envious. I cover that distance in about a month, and only really use the car for commuting etc.

Iíd rather have your fuel bill than mineÖ
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Old 14th Mar 2022, 17:09
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Originally Posted by Avionker View Post
I only ask as Iím slightly envious. I cover that distance in about a month, and only really use the car for commuting etc.

Iíd rather have your fuel bill than mineÖ
The best bit is rolling past the fuel queue at Tesco as they wait to pay inflated prices then park near the door and get a free charge while we shop. Or it would be if I had a reason to go there, which is not often, but next time I top up, I might.
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Old 14th Mar 2022, 18:31
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Originally Posted by Piper.Classique View Post
It's even worse if you are on three phase. Which we are.
Pah! You should try it with four phase !!!
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Old 14th Mar 2022, 19:19
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So, I grabbed my multimeter and stuck the probes into a power socket and found that we were being supplied with a very steady 99 Volts AC. This was maintained even when I powered on a toaster in the adjacent socket of the twin outlet so it was not caused by a high resistance in the supply line to the house. I still have not figured out how this voltage could be supplied, I doubt that the supply infrastructure would be equiped with a 100 Volt option in place of the normal 230 Volts.

No doubt somebody will know how this can happen?
A family member reliably informs me that it could be a single phase has dropped out on the 11kV side.
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Old 15th Mar 2022, 13:37
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A family member reliably informs me that it could be a single phase has dropped out on the 11kV side.
or they were waiting on the dockside for the next load of wood pellets from the US.
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