ABB REM620 Motor Relay

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ABB REM620 Motor Protection and Control Relay

1. Product Overview

The ABB REM620 belongs to the Relion® 620 series and is an intelligent protection and control relay designed specifically for medium and large asynchronous or synchronous motors.
It provides comprehensive motor protection, measurement, control, and supervision functions in a single unit.
The device integrates current and voltage measurement, advanced motor protection algorithms, communication capabilities, and system diagnostics, making it ideal for demanding industrial applications requiring reliability and precision.

2. Technical Specifications (Typical Key Data)

• Supported protection functions:
  Three-phase overcurrent, undervoltage, negative-sequence current, frequency supervision, stall protection, rotor earth fault, differential protection, and thermal overload protection.

• Measurement accuracy:
  For three-phase current measurement within 0.01–4.00 × In range, the accuracy is ±0.5% or ±0.002 × In.

• Communication interfaces and protocols:
  Supports Ethernet and serial ports with IEC 61850, Modbus TCP/IP, DNP3, and IEC 60870-5-104 communication protocols.

• Input/output modules:
  Supports analog inputs, RTD temperature sensors, and digital I/O expansion modules for external control or monitoring.

• Response time:
  Protection element operation time less than 3 ms for critical trip functions.

• Environmental conditions:

  • Operating temperature: –25 °C to +55 °C

  • Storage temperature: –40 °C to +85 °C

  • Relative humidity: ≤ 95% (non-condensing)

• Power supply:
  Typical auxiliary voltage 24–250 V AC/DC depending on configuration.

• Mounting type:
  Flush-mounted or rack-mounted design suitable for switchgear and MCC panels.

3. Product Advantages and Features

Advantages:

• High integration: Combines motor protection, control, measurement, and supervision functions, simplifying system configuration and wiring.

• Scalable design: Flexible modular structure supports additional I/O and communication modules for system expansion.

• Industrial reliability: Built for harsh industrial environments; ensures dependable protection and high operational continuity.

Features:

• Comprehensive motor protection: Provides protection against overload, locked rotor, phase imbalance, undervoltage, differential faults, and earth faults.

• Advanced monitoring: Real-time measurement of motor current, voltage, active/reactive power, power factor, and temperature.

• Strong communication capability: Fully supports IEC 61850 for modern digital substations and SCADA systems.

• Accurate measurements: High-precision current and voltage inputs ensure dependable motor diagnostics and trend analysis.

• Rugged design: High electromagnetic compatibility (EMC) and mechanical endurance for industrial environments.

• Modular and serviceable: Modular components enable quick replacement, upgrades, and maintenance without system downtime.

4. Application Fields

The ABB REM620 is widely used in both industrial and utility applications, such as:

• Motor control centers (MCCs): For large and medium-voltage motor feeders.

• Process industries: Including chemical, petrochemical, pulp and paper, steel, and mining sectors.

• Power generation and transmission: For auxiliary motors, pumps, fans, and conveyor systems.

• Water and wastewater treatment plants: For reliable motor protection in pumps and agitators.

• Industrial automation and manufacturing systems: Where continuous monitoring and protection of motors are required.

• Data centers and infrastructure facilities: For intelligent protection and remote monitoring of critical equipment.

5. Precautions and Installation Notes

1. Model selection:
   Ensure that the rated current, voltage, and motor starting type match the technical capability of the REM620 relay.

2. Wiring and connection:
   Follow ABB’s wiring diagrams strictly. Verify proper CT and VT polarity and ratio to prevent protection malfunctions.

3. Parameter configuration:
   Before commissioning, correctly set protection thresholds, time delays, and protection curves. Perform a full functional test.

4. Grounding and EMC:
   Proper grounding and electromagnetic compatibility measures are required to avoid noise and interference.

5. Environmental conditions:
   Avoid exposure to high temperature, high humidity, vibration, dust, or corrosive atmospheres.

6. Routine inspection:
   Regularly check relay terminals, communication ports, sensors, and wiring for looseness, corrosion, or contamination.

7. Data backup:
   Save configuration parameters and firmware versions for fast restoration during maintenance or replacement.

The structure and details of the product：

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