What are INSTRUMENT TRANSFORMERS , name them ?
Transformers range in size from a thumbnail-sized coupling transformer hidden inside a stage microphone to huge units weighing hundreds of tons used in power stations, or to interconnect portions of power grids. All operate on the same basic principles, although the range of designs is wide. While new technologies have eliminated the need for transformers in some electronic circuits, transformers are still found in many electronic devices. Transformers are essential for high-voltage electric power transmission, which makes long-distance transmission economically practical. Examples are the
The second type is the current transformer. This instrument transformer variant measures current and is used to drive ammeters and overcurrent protection relays. The typical CT differs from its voltage-reliant sibling in that it is connected in series with the supply and typically utilizes an induced primary feed and not a direct connection. To achieve this, a CT is produced with a hole in its center through which a high tension cable runs. The curre ...more