What Is a 400Hz Transformer?

Transformer

• A transformer transfers electricity from two different circuits through the process of induction. Two coils are separated by air or liquid, and the electricity flows through the medium. The further apart the coils are, the more the voltage is reduced. This works because AC power creates a magnetic field around the coil. As long as the coils are close enough for the two magnetic fields to touch, power is transmitted.

Hertz

• The measure of a repetitive occurrence every second is called the Hertz (Hz), or cycles per second. In alternating current electricity, this is the number of times the power changes direction along the electrical conductor. The standard in North America for residential applications is 60Hz. Most of Europe uses a 50Hz electrical system.

400Hz Transformer

• A 400Hz transformer is simply a transformer that is designed to operate at 400 cycles per second. This type of transformer is actually much smaller than a 60Hz device. They are used for specialized applications in the military, aerospace and aircraft industries. Commercial airliners use 400Hz transformers to power the overhead lights, air conditioning, landing gear, wing flaps, toilets, radar, TV screens and radios.

Why Use A 400Hz Transformer?

• This type of transformer is used in very specialized situations and is typically a custom build. It is only chosen because of its reduced weight and size and is considered very reliable. For this reason it is used in very specific industries where the weight and reliability of their product is vital to its performance and safety. The drawback to this type of transformer is its high cost.