virtamuuntoriin

Virtamuuntoriin is a Finnish term that translates to "current transformer" in English. It refers to a type of electrical transformer that is used to measure high alternating currents. The primary winding of a current transformer has very few turns, often just one, and is connected in series with the line carrying the current to be measured. The secondary winding has many more turns and is connected to measuring instruments such as ammeters or relays.

The principle of operation relies on electromagnetic induction. The high current flowing through the primary winding creates a strong magnetic field in the transformer's core. This magnetic field then induces a current in the secondary winding. The ratio of the number of turns in the secondary winding to the number of turns in the primary winding determines the transformation ratio, which allows the high primary current to be scaled down to a manageable level for the connected instruments.

Current transformers are essential for safely and accurately monitoring and controlling high-voltage electrical systems. They isolate measuring instruments from the high voltage of the primary circuit, protecting both the equipment and personnel. Their use is widespread in power generation, transmission, and distribution networks, as well as in industrial applications where large currents are present. Accuracy is crucial for current transformers to ensure reliable measurements and proper operation of protective relays.