Find A Transformer’s Turns, Phasing And Coupling Factor With An RLC Bridge

by Paul L. Schimel, Microchip Technology, Chicago, Ill. , How2Power Today, Aug 13 2021

Focus:
During his tenure in telecom rectifier and central office power design, the author’s engineering lab was a short walk from the factory floor. This was a good environment for learning the benefits of engineering collaboration with production. One time, while releasing a transformer that was to be built in-house, a coil winder taught the author some valuable lessons in measurement and humility. In this article, the author shares this story, while explaining the very useful measurements you can make on transformers using a simple RLC bridge. These tricks may save you the trouble of hauling out the bigger instruments, when confronted with undocumented coils in transformers, motors and polyphase systems.

What you’ll learn:

• How to measure transformer turns ratio, coupling, and phasing with an RLC bridge

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