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MRI CT Scanners and DNO Voltage fluctuations.

Ian King

How are older (6-10 years) MRI CT scanners running in the UKs Hospitals coping with Line voltage peaks exceeding 440 volts rms ?

Is it fair to link peaks like this on PV on sunny days even in winter ?

Ian King MIET.

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    Such as if the transformer was tapped at a low ratio historically, and the local HV is now running higher than nominal due to reduced load.

    That's a fair point. Historically it's no unknown for transformers supplying installations with a hefty "base load" and long lengths of LV distribution cables to be tapped to something higher than normal - to counteract the "inevitable" voltage drop in the distribution system. If however local PV (or other on-site generation) effectively reduces demand from the grid, the voltae drop along the distribution system would also drop - leading to higher than intended voltages at appliances. Not really the fault of the PV though - the same might come about just by conventional energy efficiency measures.

        - Andy.

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    Such as if the transformer was tapped at a low ratio historically, and the local HV is now running higher than nominal due to reduced load.

    That's a fair point. Historically it's no unknown for transformers supplying installations with a hefty "base load" and long lengths of LV distribution cables to be tapped to something higher than normal - to counteract the "inevitable" voltage drop in the distribution system. If however local PV (or other on-site generation) effectively reduces demand from the grid, the voltae drop along the distribution system would also drop - leading to higher than intended voltages at appliances. Not really the fault of the PV though - the same might come about just by conventional energy efficiency measures.

        - Andy.

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