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Minimum Voltage at incoming supply point

FlyWheel
Retired now and not up to date with reg’s since 16th. Helping advise a friend. Currently they have 100amp single phase supply and whilst the no load voltage is up at around 238 volts, as the circuit is loaded, voltage drops off substantially. Even with a load of 50 amps, ie, half the supply fuse rating, voltage is slightly below the -6% limit, at around 215 volts, further load simply pushes voltage significantly lower, and by extrapolating measured data, it would be nearer 170 volts with a load of 100 amps, is this acceptable? I plan measuring Ze and pfc this week as a guide perhaps to supply loop impedance and, which I suspect must be causing this excessive drop. I’m aware of the ESQCR reg’s although need to update myself, but are there any other regulations that apply?

Parents
  • 0
    DNO have been aware of the extra load since the outset, and an upgrade price of £8k would be a bargain. What it has done so far for me is to confirm my thoughts on heat pumps generally, and particularly as the weather gets colder and COP perhaps drops to less than one, ie, less than that of a resistive heating load, and far less efficient too! I'm talking to the manufacturer about this and already have some usefull data coming from them! Defrost cycles also more frequent too in the cold weather, add further to their inefficiency. I'm pursuing that seperatelly.   

    It's also got me wondering about Ze and pfc measurements generaly, particularly with standard multitester or look tester kit, Measurements are sunstancially affected by other paralled loads on the supply network, I never did get this mentioned on the 2391 course!
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  • 0
    DNO have been aware of the extra load since the outset, and an upgrade price of £8k would be a bargain. What it has done so far for me is to confirm my thoughts on heat pumps generally, and particularly as the weather gets colder and COP perhaps drops to less than one, ie, less than that of a resistive heating load, and far less efficient too! I'm talking to the manufacturer about this and already have some usefull data coming from them! Defrost cycles also more frequent too in the cold weather, add further to their inefficiency. I'm pursuing that seperatelly.   

    It's also got me wondering about Ze and pfc measurements generaly, particularly with standard multitester or look tester kit, Measurements are sunstancially affected by other paralled loads on the supply network, I never did get this mentioned on the 2391 course!
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