100va toroidal transformer is equal to 90W.
The unit of the transformer is apparent power: that is, VA Its conversion to active power, that is, W, needs to be multiplied by the power factor. Assuming that the power factor = 0.9, then 100VA × 0.9 = 90W.
The toroidal transformer is a large type of electronic transformer, has been widely used in home appliances and other technical requirements of electronic equipment, its main purpose is to serve as a power supply transformer and isolation transformer. Toroidal transformer in foreign countries has a complete series, widely used in computers, medical equipment, telecommunications, instruments and lighting and other aspects.
China's toroidal transformers in the past decade from scratch, so far has formed a considerable production scale, in addition to meet domestic demand, but also a large number of exports. Domestic mainly used for home appliances, audio equipment and automatic control equipment and quartz lamp lighting and so on.
Precautions
1. Standard power transformer product series capacity 8 ~ 1500VA, has a small voltage adjustment rate, full-load operation temperature rise of only 40 ℃, allowing short-time overload operation, suitable for demanding applications. The primary and secondary windings are insulated with polyester film insulation of class B (130℃), which is required to be wrapped with at least three layers of insulating tapes, and can withstand AC 4000V, 1min voltage withstand test.
2. Economic power transformer product series capacity of 50 ~ 1500VA.
3. Isolation transformer product series capacity of 50 ~ 1000VA, all primary leads must be double insulated wire. The maximum temperature rise of the transformer is less than 45℃. In addition to the medical isolation transformer is also required in the primary winding is equipped with a temperature protection switch, when the core temperature reaches 120 ℃, the temperature protection switch is disconnected, when the temperature returns to normal, the switch is automatically reset to close.