Classification and performance advantages of current transmitters

There are two types of current transmitters: DC current transmitter and AC current transmitter. The AC current transmitter is an instrument that can convert the measured AC current into a DC voltage or DC current in a linear proportion. The product is widely used in electrical equipment in the electric power, post and telecommunications, petroleum, coal, metallurgy, railway, municipal and other departments , Automatic control and dispatching system. The AC current and voltage transmitters have a single-channel and three-channel combined structure. The connection of current transmitter is divided into single-phase and three-phase current transmitter. Among them, a single-phase transmitter can input a secondary current from a current transformer, either phase A, B, or C. The three-phase current transmitter can input the three-phase current from the current transformer, generally the secondary current of the A, B, and C phase transformers, the corresponding output is three-way output, and the commonly used is 4-20MA DC current . In addition, a working power supply is required, both DC24V and AC220V are available. The six wires you mentioned may be three-phase current transducers. The performance advantages of the current transmitter 1. It is not easily affected by parasitic thermocouples and the resistance voltage drop and temperature drift along the wire. The transmission line can use very cheap and thinner twisted pair wires; 　　2, when the output resistance of the current source is large enough, The voltage induced by the magnetic field coupling into the wire loop will not have a significant impact, because the current caused by the interference source is very small, and the twisted pair can generally be used to resist and reduce the interference; 　　 3. Capacitive interference will cause errors related to the receiver resistance For a 4-20mA two-wire loop, the receiver resistance is usually 250Ω (sampling Uoutu003d1～5V). This resistance is too small to produce a significant error. Therefore, the allowable wire length is longer and farther than the voltage telemetry system　　4, each single display device or recording device can be switched between different channels with different wire lengths, and there is no difference in accuracy due to the unequal wire length; 　　5, 4mA is used for the zero level to make the judgment Open circuit or sensor damage (0mA state) is very convenient.　　6. u200bu200bIt is easy to add surge and lightning protection devices to the two-wire output port, which is beneficial to safety, lightning protection and explosion protection.

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