1, transformer no-load time: 365 (days) X 24 (hours) = 8760 hours. We use the value of 8760 in calculating the transformer's transformer cost, because we consider that once the transformer is hooked up to the Internet, he is working continuously, not taking into account that he is taken out of operation on holidays. The 6,000 hours is considering two days off in 52 weeks per year, plus another day off for holidays, at 250 days per year: 250 X 24 = 6,000 hours. That's no more no-load losses incurred when you have to withdraw the transformer from the grid on a holiday. But in general I think that on holidays people will not go to the transformer from the grid to pull the gate down. It should be counted at 8760 hours as appropriate.
2, the transformer annual full load running time, that is more intricate. For example, in the factory, is a two-shift or three-shift? In schools, in hospitals, in stations, in neighborhoods and so on the situation is completely different. Referring to the statistical data on the power yearbook, we take 25-30% of the no-load operation time as the transformer full-load operation time to consider (according to 2400 hours to consider). There should be a difference with the age and nature of the user. You should be based on your user's situation to determine the more reasonable.
3, load factor is the same, different situations have different coefficients. I think the neighborhood (residential or office buildings) should be taken 75%, while the big malls and so on should be taken a little higher for proper.
4, in short, these are estimates, will not be very correct. Maybe after the transformer has been running for a while, you have the experience to determine these figures, may be more correct.
Maybe your experience will help others in the future.
Welcome to share.