ABB RET620 Transformer Management Relay

• ABB RET620 Transformer Management Relay

  1. Product Overview

  The ABB RET620 is a dedicated transformer protection and control relay designed for the protection, control, measurement, and supervision of two‑winding or three‑winding power transformers and generator transformer blocks in utility and industrial power distribution systems. It integrates advanced differential protection, overcurrent and earth fault protection, over/undervoltage protection, thermal overload supervision, and communication capabilities. As part of ABB’s Relion® 620 series, RET620 supports modern IEC 61850 communication standards and multiple industrial protocols for seamless integration into substation and automation systems.ABB Group

  2. Technical Specifications

  • Model: ABB RET620

  • Product Type: Transformer Protection & Control Relay

  • Application: Two‑winding / Three‑winding power transformers and generator transformer blocks

  • Protection Functions: Differential protection (87T), Overcurrent (50/51), Earth Fault (50N/51N), Over/Undervoltage (27/59), Thermal Overload (49)

  • Differential Stability: Second and fifth harmonic restraint, advanced waveform blocking

  • Communication Protocols: IEC 61850 (Edition 1 & 2), Modbus RTU, DNP3, IEC 60870‑5‑103

  • Time Synchronization: IEEE 1588 v2 (optional precision timing)

  • Display & UI: Large graphical LCD with customizable single line diagrams; local and browser‑based HMI

  • I/O: Configurable digital and analog inputs and relay outputs

  • Power Supply: Options include 24–250 V DC/AC or 100–240 V AC/DC

  • Mounting: Panel or cabinet installation

  • Environmental: Industrial temperature range typically ‑25 °C to +55 °C

  • Product Series: Relion® 620 family for substation and industrial protection useABB Group

  3. Advantages and Features

  1. Comprehensive Transformer Protection
     Provides fast and selective differential, earth fault, over/undervoltage, and thermal overload protection.ABB 图书馆

  2. High Stability and Reliability
     Harmonic restraint and waveform blocking improve stability during inrush and overexcitation conditions.ABB 图书馆

  3. Control and Monitoring Capabilities
     Enables control of circuit breakers, disconnectors, and grounding switches and monitors transformer condition.MansIO

  4. Advanced Communication
     Supports modern protocols and time synchronization for integration with SCADA and automation systems.ABB Group

  5. Configurable and User Friendly
     PCM600 configuration and large graphical display make setup and maintenance straightforward.ABB 图书馆

  4. Typical Applications

  • Transformer protection in utility distribution networks

  • Industrial transformer monitoring and protection

  • Generator transformer blocks

  • Substation automation systems

  • Power systems requiring high reliability and remote communication

  5. Installation and Usage Notes

  • Always disconnect power before installation and follow safety procedures.

  • Ensure relay supply, CT and VT ratings match transformer and system parameters.

  • Wire according to diagrams and ensure proper grounding.

  • Regularly check relay condition, event logs, and communication interfaces.

  • Avoid use in high temperature, high humidity, or corrosive environments for reliable operation.

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The structure and details of the product：

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