Combined instrument transformers contain a current transformer and an inductive voltage transformer within the same body.
Thus they are used in the same applications as their respective independent transformers; they separate meters, counters, relays, etc., from the high voltage circuit, and provide a scaled replica of the current and voltage in the HV line.
Combined transformers are suitable for use in substations where space or installation costs make using independent Transformers difficult.
- Ideal for installation at metering points due to their very high accuracy class, both in current and voltage.
- Suitable for the discharge of high-voltage lines and capacitor banks.
- Excellent frequency response; ideal for monitoring power quality and measuring harmonics.