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R120 AVR Complete Details And Price

R120 AVR

Category: Spare Parts

spare parts in Nepal.

1 reviews

Nrs. 18000

The R120 Automatic Voltage Regulator (AVR) is a critical component designed to ensure stable voltage output in synchronous generators, typically used in power generation systems. Here are the key features and functionalities of the R120 AVR:

Key Features

  1. Voltage Regulation:

    • Maintains a constant output voltage despite varying load conditions, ensuring the electrical system's stability.
  2. Compact Design:

    • Small and lightweight, allowing for easy integration into various generator designs.
  3. Sensing Input:

    • Can sense single-phase or three-phase voltage inputs, providing versatility in application.
  4. Excitation Control:

    • Controls the excitation of the generator’s field winding to regulate the output voltage.
  5. Overvoltage Protection:

    • Protects the generator and connected equipment from overvoltage conditions by limiting the output voltage.
  6. Stability Adjustments:

    • Includes settings for fine-tuning the system's response and stability, allowing for optimal performance under different operating conditions.

Functional Description

  1. Input Voltage Sensing:

    • The AVR senses the generator's output voltage and compares it to a reference value.
    • If the output voltage deviates from the desired setpoint, the AVR adjusts the excitation current.
  2. Excitation Control:

    • By increasing or decreasing the excitation current supplied to the generator’s field winding, the AVR controls the magnetic field strength.
    • This adjustment directly influences the generator's output voltage, correcting any deviations from the setpoint.
  3. Protection Mechanisms:

    • The AVR includes protective features to prevent damage to the generator and connected loads.
    • Overvoltage protection mechanisms are built in to disconnect or reduce the excitation current if the voltage exceeds safe limits.
  4. Stability and Response:

    • The AVR provides adjustable settings for response time and damping.
    • These settings help to balance the generator’s performance, ensuring smooth voltage regulation without oscillations or instability.


The R120 AVR is commonly used in:

  • Power Generation Plants: Ensures the stable operation of large generators supplying power to grids or industrial applications.
  • Standby and Prime Power Generators: Provides reliable voltage regulation in backup power systems or continuous power supply generators.
  • Marine and Offshore Generators: Used in generators on ships or offshore platforms where stable power is critical for operations.

Technical Specifications (Example)

  • Input Voltage Range: 95-132V or 170-264V AC
  • Frequency Range: 50/60 Hz
  • Voltage Regulation Accuracy: ±1%
  • Operating Temperature: -40°C to +70°C
  • Dimensions: Typically compact for easy mounting within generator control panels

Installation and Maintenance

  • Installation:

    • Mounted inside the generator control panel, with connections to the generator's sensing and excitation circuits.
    • Requires proper calibration during setup to match the generator’s characteristics and operational requirements.
  • Maintenance:

    • Periodic inspection and testing to ensure optimal performance.
    • Checking connections and calibration as part of regular generator maintenance routines.

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