Abb is well known for a wide range of instrument transformers. The transformers provide accurate inputs to protection, control and metering systems including revenue metering. The main features of instrument transformers are as follows:
1 to transform currents or voltages from a usually high value to a value easy to handle for relays and instruments
2 to insulate the metering circuit from the primary high voltage system
3 to provide possibilities of standardizing the instruments and relays to a few rated currents and voltages.
The models of instrument transformers are current transformers, voltage transformers, combined current/voltage transformers and coupling capacitors for power line carrier applications.
