The form of Electrical Current Transformer in today's situation

The transformer level and accuracy level have been greatly improved, and many special transformers have been developed, such as voltage and current composite transformers, DC Electrical Current Transformer, high-accuracy current ratio devices and voltage ratio devices, high current laser type Electrical Current Transformer, electronic circuit compensation transformers, photoelectric transformers in ultra-high voltage systems, and voltage and Electrical Current Transformer in SF6 fully enclosed combined electrical appliances (GIS).

In the power industry, what voltage level and scale power system is to be developed, must develop the corresponding voltage level and accuracy transformer to meet the needs of power system measurement, protection and control.

With the continuous application of many new materials, many new types of transformers have appeared. Electromagnetic transformers have been fully developed. Among them, the core type Electrical Current Transformer has a variety of dry, oil-immersed and gas-insulated structures. Adapted to the development needs of power construction. However, with the continuous growth of power transmission capacity, the continuous improvement of grid voltage levels and the continuous improvement of protection requirements, the general iron-core type Electrical Current Transformer structure has gradually exposed weaknesses that are not compatible with it. Its inherent large volume and magnetic Weaknesses such as saturation, ferromagnetic resonance, small dynamic range, and narrow use frequency bands are difficult to meet the development needs of the new generation of power system automation and power digital networks.

With the rapid development of optoelectronic technology, many technologically developed countries have turned their attention to the use of optical sensing technology and electronic methods to develop a new type of electronic electrical current transformer, referred to as optoelectronic electrical current transformer. The International Electrotechnical Association has issued the standard for the electronic Electrical Current Transformer. The meaning of electronic transformer includes not only photoelectric transformers, but also various other voltage and electrical current transformers that use the principle of electronic testing.