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Low-Voltage Reactive Power Compensation Controller​

The low-voltage reactive power compensation controller is designed for low-voltage reactive power compensation systems and is used to provide precise and rapid compensation control for capacitor banks. It utilizes a DSP core chip, supports single-phase and three-phase compensation, and offers flexible parameter setting, fast switching response, and multiple control modes. With RS-485 communication, MODBUS protocol support, and temperature sensing and protection functions, it is suitable for low-voltage compensation systems requiring stable, intelligent, and efficient control performance.

Main Features

  • Utilizes a DSP core chip to meet more precise and rapid compensation requirements

  • Ultra-thin design for compact installation

  • Equipped with a custom LCD screen, offering extensive parameters and flexible operation

  • Wide voltage power supply, suitable for various environments

  • Features an RS-485 communication interface, supporting the MODBUS protocol

  • Single-phase and three-phase compensation with output switching trigger signal <20ms

  • Allows custom setting of each capacitor’s physical capacitance value

  • Supports two switching schemes: cyclic (any coding) and linear (first in, first out)

  • Adjustable compensation speed options: dynamic and static

  • Temperature sensing and control output function to protect the compensation unit from high-temperature operation

  • Offers both manual and automatic control modes

Applications

  • Low-voltage reactive power compensation systems
  • Capacitor bank control applications
  • Single-phase and three-phase compensation control

Technical Data

  • Operating Environment

  • Altitude: ≤2500 meters

  • Ambient Temperature: -20℃ to +70℃

  • Relative Humidity: 20% to 90% at 40℃

  • Atmospheric Pressure: 79.5 KPa to 106 KPa

  • Environmental Conditions
    Surrounding media should be free from explosive hazards, gases that could damage insulation or corrode metal, conductive dust; the installation site should not be subject to significant vibration and should be protected from wind and snow.

  • Basic Parameters
    Power Supply Voltage: AC220V ±20%, 50Hz
    Sampling Voltage: AC380V, 220V
    Sampling Current: 0 to 5A
    Power Consumption: ≤12W
    Measurement Accuracy
    Voltage: ±0.5%
    Current: ±0.5%
    Power Factor: ±1.0%
    Reactive Power: ±1.0%

  • Control Parameters
    Number of Capacitor Circuits: 1 to 12/18/24 circuits (temperature control and alarm output optional)
    Current Transformation Ratio: 1 to 1000 (e.g., set to 100 for 500/5 CT)
    Overvoltage Setting: 400V to 480V / 230V to 280V, step 1V
    Undervoltage Setting: 300V to 360V / 180V to 210V, step 1V
    Harmonic Voltage Setting: 0 to 25%
    Harmonic Current Setting: 0 to 100%
    Target Power Factor: 0.85 to 1.0
    Switching Threshold: 0.5 to 1.2, step 0.1
    Switching Delay: 0.02s to 600s
    Discharge Delay: 0s to 300s
    Switching Mode: 0 (cyclic), 1 (linear)
    Capacitor Capacitance Value: 0 to 200 Kvar, step 1
    Sensitivity: ≤100mA
    Output Contact: Each circuit DC12V/30mA or AC250V/5A