Compact relay

Products and reference designs

Compact relay

Block diagram

Overview

Single function protection relays (SFPRs) are used for time-graded current (over current or short circuit), voltage (over voltage, under voltage, voltage unbalance) and frequency protection applications. Single function or compact relays are used in low-voltage applications. They are DIN rail-mountable and are easy to install, operate and commission. The wide-range power supply for AC and DC make these relays universal. Compact relays can be single or three phase relays.

Single function protection relays use MCU with an internal ADC for measuring the electrical parameter. A seven segments LED or character LCD is provided to display measured parameters. LEDs are provided for quick indication of the load status and other system functionalities. One or two relay outputs are provided for disconnecting the load during fault conditions. The parameter settings are configured using keys, rotary switches or potentiometers provided on the front panel. An RS-485 interface with MODBUS protocol is provided for networking.

Design requirements

    Modern compact relay designs can help:

  • Optimize the cost, size and performance of the MCU with integrated AFE and LED drive for capturing and processing of analog input signals and implementing protection algorithm.
  • Power supply designs can help improve efficiency for wide input AC and DC voltages.
  • Relay drivers and seven-segment LED drivers can be used depending on the drive requirements.

Block diagram

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Compact relay

ISO_5.0V ISO_5.0V ISO_3.3V ISO_3.3V AC Input AC Input 12V 12V CT Input CT Input 12V 12V 3.3V 3.3V 5.0V 5.0V 24V DC Input 24V DC Input Non-Isolated DC/DC Power Supply Non-Isolated DC/DC Power Supply DC/DC DC/DC LDO LDO MUX MUX Non-Isolated DC/DC Power Supply - CT Input Non-Isolated DC/DC Power Supply - CT Input MOSFET MOSFET Shunt Regulator Shunt Regulator Reference Reference Comp Comp Isolated DC/DC Power Supply Isolated DC/DC Power Supply Transformer Driver Transformer Driver Module Module Isolated AC/DC Power Supply Isolated AC/DC Power Supply Flyback Flyback Reference Reference DC/DC DC/DC Wireless Interface Wireless Interface NFC NFC LPRF LPRF Wi-Fi Wi-Fi Signal Output Protection Signal Output Protection ESD Diode ESD Diode Surge Clamp Surge Clamp TVS TVS Wired Interface Wired Interface USB USB RS-232 RS-232 RS-485 RS-485 CAN CAN HMI User Output HMI User Output MOSFET MOSFET Relay Driver Relay Driver LCD Backlight LCD Backlight 7-Segment/LED Display 7-Segment/LED Display Signal Interface Isolation Signal Interface Isolation Digital Isolator Digital Isolator Digital Processing Digital Processing MCU MCU Analog Front-End Analog Front-End Reference Reference ADC ADC COMP COMP AMP AMP Signal Input Protection Signal Input Protection Protection Protection Self-Diagnostics/Monitoring Self-Diagnostics/Monitoring Temp Sensor Temp Sensor Supervisor/Watchdog Supervisor/Watchdog HMI User Input HMI User Input LDC LDC CapTIvate CapTIvate Logic Logic Input Isolation Input Isolation AMC AMC

Technical documentation

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Type Title Date
White paper Enabling and integrating wired & wireless technologies for grid interoperability 22 Mar 2019
Application note HSR/PRP Solutions on Sitara Processors for Grid Substation Communication 17 Apr 2018
Application note Introduction to HVDC Architecture and Solutions for Control and Protection (Rev. B) PDF | HTML 11 May 2022
Application note Expanding Analog Input Channels in Grid Applications (Using 16-Channel, 16-Bit, (Rev. A) 10 May 2022

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