Thanks, for the On load tap changer to operate, as you know, it must sense the VAC, then adjust the tap as appropriate. So the VAC voltage would go up to X volts, then the Tap changer would operate.
The golden question is then, for how long does the mains spend at the “too-high” voltage before the on load tap changer operates?
We had a Littelfuse rep saying that once in every 20 years, the mains goes up to 284VAC. (He didn’t say for how long this happens though).
The piece of info that cannot be found anywhere, is the mains voltage excursions outside 230 to 250VAC, (210 to 230VAC in mainland Europe) and for how long they last…….and finding this info for where the biggest violation occurs in whichever country.
Another Edaboard member very kindly sent me some data on mains voltage excursions at one outlet for a City in Germany. It was amazingly well regulated. It would be great if one could find such data for the worst case area of a developed country. (ie where the mains is most variant)
To think that all these engineers designing power supplies for mains operation...and they cant really know what is the true range of the mains input voltage to their power supply.