Working Principle of Active/Reactive Power Transducer S3(T)-WRD-3-555A4BNN

Working Principle of Active/Reactive Power Transducer S3(T)-WRD-3-555A4BNN

The power transmitter S3(T)-WRD-3-555A4BNN is an important power measuring device, which can accurately measure the active power (P), reactive power (Q) and their combined apparent power (S) in the circuit, and convert these measured values into linear output signals, usually current or voltage signals, for the convenience of long-distance transmission and display.


This kind of transmitter S3(T)-WRD-3-555A4BNN is single-phase two-wire type, which is usually used in the power system to monitor and manage the power consumption. It can monitor the power consumption and transmission efficiency of the equipment, so as to improve the resource utilization. Its working principle involves the basic principle of power measurement and signal conversion, which is briefly described as follows:


  • Signal acquisition: the transmitter collects current and voltage signals in the circuit through current and voltage transformers and other sensors. The current transformer converts large current into small current, and the voltage transformer converts high voltage into low voltage to ensure signal safety.
  • Signal processing: the acquired analog signal passes through the preprocessing circuit, such as filtering and amplification, to ensure the signal quality. These signals are then fed to an analog-to-digital converter (A/D converter), which converts the analog signals into digital signals for digital processing.
  • Digital signal processing: the digital signal is processed by the microprocessor, and the active power, reactive power, electric energy and other parameters are calculated according to the sampling values of current and voltage. The microprocessor is also responsible for performing other tasks, such as linearization, unit conversion, damping, rooting, and diagnostics and digital communications.
  • Output signal: the processed digital signal is converted back to analog signal by digital-analog converter (D/A converter) to form standard 4-20mA current output, and this current signal can be transmitted to remote display, recording and regulating equipment.
  • Communication function: The single-phase two-wire power combination transmitter usually has the communication function, which can exchange data with the control system through specific communication protocol (such as HART protocol) to realize remote monitoring and control.
  • Power management: The transmitter usually receives 24V DC power supply, and the power line and signal line usually share two lines, i.e. two-wire system, which is also the meaning of the word “two-wire”.


S3(T)-WRD-3-555A4BNN transducers collect and calculate electrical parameters accurately, provides a reliable way to monitor and measure the power consumption of single-phase circuit, and outputs standard current signal, which is convenient for integrating with various instruments and control systems.


There are different types of sensors used for different steam turbine units. Check if it has the sensor you need, or contact us for more details.
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  • Post time: Jan-09-2024