Winding Temperature Rise by ANSI
Winding Temperature Rise by ANSI
(OP)
Winding Temperature Rise by ANSI
Hi all,
Please somebody to say me what is different between 55 and 65 C temperature rise when design a transformer. How to decide what of the two values to use.
Hi all,
Please somebody to say me what is different between 55 and 65 C temperature rise when design a transformer. How to decide what of the two values to use.






RE: Winding Temperature Rise by ANSI
Virtually all transformers today utilize insulation systems that are rated for 65 deg. C rise. In the interest of saving initial investment, most transformers today are purchased for straight 65 deg. C rise. A transformer rated for 65 deg C will be less expensive than one of the same kVA but rated for 55 deg. C rise.
RE: Winding Temperature Rise by ANSI
May I suggest there is some tendency to spec 55°C rating for cases where some reliability/headroom is desired? Compare a burger stand on a freeway exit favoring the 65°C-rise unit, where padmount transformer dimensions have been standardized as almost a commodity item in utilities. A set of articulated secondary-unit substations fitted with drawout air-frame circuit breakers, for a 24/366 data center, may be appropriate for 55°C-rise units.