Type of current transformer

The types of current transformers can be classified according to different classification standards. ‌‌

Classified by purpose:

Current transformers can be divided into measuring current transformers and protective current transformers. Measurement current transformers are mainly used for current measurement, while protection current transformers are mainly used for power system protection and fault detection.

Classified by insulation medium:
Plastic shell type current transformer
Dry type current transformer
Cast in place current transformer
Oil immersed current transformer

Gas insulated current transformer

Classified by the principle of current transformation:
Electromagnetic current transformer: operates based on the principle of electromagnetic induction.

Optoelectronic current transformer: using optical principles for current measurement.

Classified by installation method:
Pillar type current transformer
Bushing type current transformer

Busbar current transformer

Classified by measured voltage level:
High voltage current transformer

Low voltage current transformer

In addition, there are electronic current transformers, which are further subdivided into optical current transformers, hollow coil current transformers, and iron core coil low-power current transformers (LPCT).