ADI’s ETU Solution for Low Voltage Circuit Breakers

Overview


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An Electronic Trip Unit (ETU) is programmable device which measures and times current flowing through the low voltage circuit breaker (MCCB and ACB) and initiates a trip signal when appropriate. As modern low voltage power distribution system requires more communication/intelligent function to realize a higher level system features (e.g. zone Interlocking), a micro-processor based electronic controller unit is becoming more and more popular in the low voltage switchgear/breaker system. ADI offers a simple system solution.

ADI offers:
  • ADP2450 from Analog Devices is an ASSP specially designed for low voltage circuit breaker like MCCB and ACB
  • It includes a low power shunt boost controller to convert a current source (output from current transformer) into voltage source and a buck regulator which can effective regulate out a 3.3V/5V/Adj power supply
  • 4x programmable PGAs with 15 different gain setting option and one general purpose OPAMP have been integrated into the ADP2450
  • 4x threshold value programmable analog trip unit inside, that support both single coil and dual coil user case
  • Simplify ETU system design that only use ADP2450, low power MCU and interface

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System Block Diagram


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Other

Design Resources

3rd Party Reference Design

    TianJin Free Soar Innovations Technology Co., Ltd. — freesoar.net
    •  Measurement functions: currents, voltages, frequency, energy, frequency factor, etc.
    •  Protection functions
    •  MCCB ETU and support RCD function
    •  LCD display
    •  Support RS-485 and Modbus-RTU protocol

Documents—AN/Articles


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