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Can a correction factor for calculating the state of health (SoH) be applied for older SPDs?

It is not possible to determine the previous load of an older SPD. The highly nonlinear behavior of the components installed in SPDs means that a retroactive calculation based on current measurement data is not possible.

Making a forecast of the aging based on the date of installation is also impossible, because aging is primarily caused by individual events – the frequency of which is unknown.

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