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, 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 majority of current and voltage table pointer, 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 current transformers general structural principle: current transformer structure is relatively simple, consisting of insulation from each other primary winding, secondary winding, core and frame, the housing, terminals, etc. Its working principle is basically the same yiyang transformer high voltage transformer, the primary winding turns (N1) is less Hefei high voltage transformer, directly connected in series Power lines, once the load current (I1) through the primary winding, alternating magnetic flux generated induced secondary current (I2) reduced proportionately; secondary winding turns (N2) more, and instrumentation, secondary load (Z) relays, transmitters and other current coil in series to form a closed loop, because the primary winding and the secondary winding has an equal ampere-turns, I1N1 = I2N2 Ganzhou high voltage transformers, current transformers rated current ratio current transformer The actual operation of the load impedance is small, the secondary winding close to a short, running the equivalent of a short circuit transformer. Yiyang high voltage transformer transformer _ _ Huayi Huayi electricity provided by power plant in Xi'an, Xi'an Huayi Electric Power Equipment Factory (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 improving innovative ideas will lead Huayi electricity and you work step the brilliant, for a better future!