Re: Автоматика РПН для трёхобмоточного трансформатора.
Пришлось покопаться, так как в принципе не знаимаюсь этим, только по нужде
Согласно стандарту IEC62271-100:
For a minimum circuit-breaker opening time of 40 ms to 60 ms increased by 10 ms, i.e. a time
of 50 to 70 ms, the percentage of DC component is 33% to 21%. A circuit-breaker with a minimum opening time of 40 ms must therefore be able to interrupt a DC component percentage of 33%. A circuit-breaker with a minimum opening time of 60 ms must therefore be able to interrupt a DC component percentage of 21%. Note: for a time interval
greater than or equal to 80 ms, IEC 62271-100 does not stipulate the use of breaking tests including a DC component. Circuit-breakers with a minimum opening time greater than or equal to 70 ms (at 50 Hz) do not have a DC component specification.The percentage curve of the DC component defined by IEC 62271-100 corresponds to a time constant of 45 ms,
Картинка.
http://rzia.ru/extensions/hcs_image_uploader/uploads/20000/6500/26761/thumb/p16r58ntiv11b81j2n1sif1p4g6gl1.gif
( не важно что не по теме, самое главное, что нам это важно)