With the application of a lot of new materials, transformer, there have been many new types of electromagnetic transformers have been more fully developed, in which the core current transformer with dry, oil-immersed and gas-insulated type variety of structures adapted to the development needs of the electric power construction. However, with the growing and constantly improve power transmission capacity, the grid voltage level continues to increase and protection requirements, the general structure of the core current transformer has gradually exposed the weakness incompatible with high voltage transformer, its inherent volume large, magnetic saturation, ferromagnetic resonance, small dynamic range, such as the use of a narrow band of weakness, it is difficult to meet the new generation of full hard power system automation, power digital network development needs. In the electricity supply lines, the current difference from a few to tens of thousands Ann Ann, the voltage difference from a few volts to several million volts. Line current and voltage are high Zibo high voltage transformers, such as direct measurement is very dangerous. In order to facilitate the secondary instrument measurement needs to be converted to a more unified current voltage converter using a transformer to play the role of transformer and electrical isolation. Different types of transformers (9) indicator pointer of mostly high-voltage transformer current and voltage table sunshine, so the majority of the current transformer secondary current is the ampere level (eg, 5, etc.). With the development of the times, the power measurement has been achieved mostly digitized and sampled signal computer is generally milliamps (0-5V, 4-20mA, etc.). Micro current transformer secondary current mA level, mainly from the large transformer and a bridge between samples. Micro current transformer called "Instrument current transformer." ("Instrument current transformer" There is a layer of meaning in the laboratory using more current than the precision current transformer, generally used to expand the range of the instrument. Binzhou high voltage transformers, high voltage transformers, electricity from Xi'an Huayi Huayi Electric Power Equipment plant to provide Xi'an Huayi power plant (www.xahy.com) strong, credible, in Xi'an high-voltage circuit breakers and other industry has accumulated a large number of loyal customers. The company better work attitude and constantly improve the innovative ideas will Huayi power lead into the brilliant and you work for a better future!