Closure between the two windings on the core of the electromagnetic induction effect

Closing the two windings on the core using electromagnetic induction effect between the measured AC current conducted by the rated value conversion ratio of the instrument. Including power system measurement and laboratory precision current  Voltage stabilizer transformer. The function of the current transformer are: ① limit the amount of extended meter to measure current; ② The rated current is converted to a uniform nominal value, in order to facilitate the standardization of the connected meter; ③ the meter and the measured line high potential isolation to ensure security; ④  power transformers transformer can be used for standard instrument used to test the accuracy level of at least two low-current transformer, or limit the amount for the extension device with a standard table, the corresponding test meter.