Power transmitters convert single-phase current/voltage in the grid into linear DC analog signals by isolating them. It is a telekinetic device. Computer detection and automatic control can be widely used in power system. Industrial control. Building systems and other industrial and mining enterprises.

A power transmitter converts the active/reactive power parameters of a power system into a linearly proportional output of pulses. Power is output in the form of open circuit optocouplers or circuit breaker contacts to accommodate different Rtus and meter recording devices. The digital output corresponds to the active (or reactive) power input to be measured. The output line is four lines, two-way digital output for positive and negative power measurement.

Power transmitter is the parameter to be measured (such as current). Voltage. Power. Frequency. A measuring instrument that converts power factor, etc., into DC current or voltage (pulse output of electrical energy) according to a linear scale. Widely used in electricity. Petroleum. Coal. Metallurgy. Railways. Electricity metering by municipal governments, etc. Automatic control and scheduling system. International standard analog signal output current value of the new transmitter is 4~20mA. Two-wire circuit systems are widely used to transmit data and to control actuators that are easy to receive instructions according to this standard. In current telemetry circuits that use two wires, the operating power supply for the emitter and reading device, including the operating power supply for the sensor and any other resistors of the transmitting wire, are in series in the circuit.

1. It is not easy to be affected by parasitic thermocouple and resistance voltage drop and temperature drift along the transmission line. The transmission line can be made of thin twisted pair conductor;

2. When the output resistance of the current source is large enough, the wireline-loop voltage caused by the magnetic field coupling will not have a significant effect, because the current caused by the interference source is small, twisted pair can generally resist and reduce the interference;

3. Capacitive interference can cause errors related to receiver resistance. The 4-20mA receiver resistance is usually 250Ω (sampling uout=1-5V), which is too small to cause significant error. Therefore, the allowable wire length is longer than that of the voltage telemetry system;

4. Each individual reading device or recording device can be connected to different channels with different line lengths, and there will be no difference in accuracy due to different line lengths;

5. It is convenient to use 4mA to judge open circuit or sensor damage (0ma state).

6. The two-line outlet is easy to install surge protection and lightning protection device, which is conducive to lightning protection. Explosion-proof safety.