testing equipment for transformer delegating right and wechselstromsignalen from one potential to another of a potential electrically separate potential with a ferro - magnetic core

摘要

A transformer with a ferromagnetic core for d-c and a-c signals includes at least one primary winding and at least one secondary winding and has a control device for changing the permeability of the core, a measuring device for measuring the change of the magnetic flux or the magnetization (ampere-turns) occurring with a permeability change, and a supplemental current source controlled in dependence on the change of the magnetic flux or the change of the magnetization connected to the secondary winding.