Rogowskikäämi
Rogowskikäämi, also known as a Rogowski coil, is a type of electrical device used for measuring alternating current (AC) and fast-changing transient currents. It consists of a flexible coil wound around a non-magnetic core, typically a plastic or fiberglass former. The key principle behind its operation is Faraday's law of induction. When an AC current flows through a conductor, it creates a changing magnetic field around it. The Rogowski coil encircles this conductor, and the changing magnetic field induces a voltage in the coil. This induced voltage is directly proportional to the rate of change of the current being measured.
To obtain an accurate measurement of the current itself, the induced voltage signal from the Rogowski coil