ABB RET620 Transformer Protection and Control Relay

The ABB RET620 is a Transformer Protection and Control Relay, designed to protect, monitor, and control transformers in power distribution systems. It offers comprehensive protection and control functions, ensuring the safe operation of both utility and industrial transformers. With a flexible and scalable design, the RET620 is part of ABB’s Relion® 620 series, supporting a wide range of system configurations and applications.

Technical Specifications

• Model Number: RET620

• Product Type: Transformer Protection and Control Relay

• Rated Voltage: 100–240 V AC/DC

• Current Transformer Inputs: 1 A or 5 A

• Number of I/O Modules: Up to 12

• Communication Interfaces: Ethernet, RS-485

• Operating Temperature Range: -40°C to +70°C

• Weight: 5 kg

Protection Functions

• Differential Protection: For two-winding transformers

• Overcurrent and Earth Fault Protection: For system stability

• Thermal Overload Protection: Safeguards transformers from overheating

• Voltage Regulation & Tap Changer Control: Maintains consistent voltage levels

• Circuit Breaker Failure Protection: Ensures system continuity

• Arc Flash Protection: Optional feature for added safety

Communication and I/O

• Protocols Supported: IEC 61850, Modbus RTU/TCP, DNP3, IEC 60870-5-103

• I/O Channels: Configurable digital and analog I/O

• Display: Large graphical LCD for easy monitoring and configuration

Physical Dimensions

• Dimensions: 440 mm x 220 mm x 220 mm (17.3 in x 8.7 in x 8.7 in)

• Mounting: Panel or rack mounting options

Operating Conditions

• Operating Temperature: -25°C to +55°C (-13°F to +131°F)

• Power Supply: 24–250 VDC or 100–240 VAC