What does OA stand for on a transformer?

The transformer typically has two load ratings: one with the fans off (OA) and a larger rating with fans operating (FA). Fans may be wired to start automatically at a pre-set temperature.

What are the information found on a transformer name plate?

The Data on the Nameplate of transformers contains of kilo-Watts rating, Voltage Rating,Frequency, Number of Phases, Temperature, Type of Cooling, \% Impedance and Reactance, Name of Manufacture,Year of Manufacture etc. A Typica Nameplate of a Transformer as follow.

What is Onan ONAF transformer?

A transformer that has natural convection cooling as a base rating and an elevated rating when fans were added later, would be designated as ONAN/ONAF. High fire point fluids use the designation of “K” for fluid type. Thus a naturally cooled high fire point fluid would be KNAN and the same unit with fans would be KNAF.

What is the meaning of dyn11 in transformer?

Dyn 11 means that the voltage of the secondary star winding lead the primary phase voltage by 30 degree and it corresponds to 11 o’clock.

What is the difference between an OA FA transformer and an OA transformer?

ONAN/ONAF (OA/FA) Same as OA, with the addition of fans. Fans are usually mounted on radiators. The transformer typically has two load ratings, one with the fans off (OA) and a larger rating with fans operating (FA).

What is the difference between Onan and ONAF?

The full form of ONAF is “Oil Natural Air Forced”. As the heat dissipation rate is faster and more in ONAF transformer cooling method than ONAN cooling system, electrical power transformer can be put into more load without crossing the permissible temperature limits.

What does motor nameplate information mean?

This data tells you at which voltage the motor is made to operate. Nameplate-defined parameters for the motor such as power factor, efficiency, torque and current are at rated voltage and frequency. When the motor is used at other voltages than the voltage indicated on the nameplate, its performance will be affected.

What does ONAF stand for?

ONAF