Application Scenarios
At a major LNG export terminal in Qatar, repeated failures of high-pressure seawater injection pumps caused unplanned shutdowns costing over $ 500K per incident. Root cause analysis revealed that conventional thermal overload relays could not account for rapid restart attempts or cooling time violations during emergency sequences. The facility replaced legacy devices with the ABB REM620A_F NAMBBABA33E5BNN1XF, leveraging its RTD-based thermal replica model and start inhibit logic. The relay now tracks real-time rotor temperature using embedded algorithms and blocks unsafe restarts until safe thermal conditions are met. Additionally, its arc protection function—triggered via fiber-optic sensors inside the motor terminal box—detected an internal phase-to-phase fault within 2 ms during a subsequent event, isolating the circuit before catastrophic damage occurred. Since deployment, pump-related outages have dropped to zero over 18 months, and maintenance teams use the relay’s trended current imbalance and vibration-derived data (via harmonic analysis) for condition-based servicing. In this mission-critical setting, the REM620A_F NAMBBABA33E5BNN1XF transformed motor protection from reactive tripping to proactive asset stewardship.
Technical Principles and Innovative Values
Innovation Point 1: Physics-Based Thermal Modeling with RTD Fusion – The REM620A_F NAMBBABA33E5BNN1XF combines calculated thermal replica (based on I²t heating) with actual RTD inputs to deliver true rotor temperature estimation—preventing insulation degradation from hidden thermal stress.
Innovation Point 2: Sub-Cycle Arc Flash Response for Motor Compartments – Using fiber-optic arc sensors, the relay detects light intensity spikes and confirms with overcurrent coincidence, issuing a trip command in <4 ms—critical for protecting personnel and equipment in enclosed motor starters. Innovation Point 3: IEC 61850 Native Architecture with GOOSE Interlocking – Enables direct peer-to-peer communication with breakers, other relays, or PLCs without protocol converters—ideal for fast motor bus transfer or coordinated shutdown sequences. Innovation Point 4: Predictive Diagnostics via Electrical Signature Analysis – Monitors current harmonics, negative-sequence components, and power quality deviations to flag developing issues like bearing wear, misalignment, or voltage unbalance—turning protection into predictive insight. Application Cases and Industry Value A municipal wastewater treatment plant in Sweden upgraded 24 sludge centrifuge motors to ABB REM620A_F NAMBBABA33E5BNN1XF relays to address frequent bearing failures caused by mechanical imbalance. By enabling the relay’s negative-sequence current monitoring and vibration proxy algorithm (derived from 2× line frequency sidebands), operators received early warnings of coupling misalignment weeks before failure. Combined with thermal start management, the system reduced motor burnouts by 90% and extended maintenance intervals by 40%. The plant’s SCADA system ingests IEC 61850 MMS data directly, eliminating gateway hardware. As one engineer stated, “We no longer wait for smoke—we see trouble coming.” Related Product Combination Solutions REM620A_F NAMBBABA33E5BNN1XF: Base model; pair with ARC620 fiber-optic arc sensors for full arc protection coverage. REF620: Feeder protection counterpart in the 620 series—ideal for upstream coordination with REM620A_F. PCM600: ABB’s engineering tool for offline configuration, simulation, and firmware management of REM620A_F relays. ABB Ability™ Electrical Distribution Control System: Cloud platform for aggregating motor health data from multiple REM620A_F units across sites. TPU600: Portable test unit for validating REM620A_F settings, timing, and arc response in the field. RED615 / RED620: Line differential relays for applications requiring unit protection on long motor feeders. MotorSense™ Sensors: ABB’s wireless vibration/temperature sensors that complement REM620A_F’s electrical diagnostics. Relion 650 Series (e.g., REU650): For ultra-high-reliability applications requiring redundant architectures and PRP/HSR networks. Installation, Maintenance, and Full-Cycle Support Installation of the REM620A_F NAMBBABA33E5BNN1XF follows standard cutout dimensions (225 × 266 mm) with rear screw terminals supporting CT, VT, RTD, arc sensor, and digital I/O wiring. Commissioning is streamlined via PCM600. which auto-generates IEC 61850 SCL files and performs virtual secondary injection tests. For arc protection, ensure fiber-optic loops are installed with minimum bend radius (>30 mm) and clean connectors to maintain signal integrity.
Routine maintenance includes quarterly review of thermal utilization logs, arc sensor status, and harmonic trends via the color HMI or remote access. The relay’s self-diagnostics monitor CT saturation, VT fuse failure, and internal clock accuracy—alerting users before performance degrades. Should replacement be required, configuration backup via USB or network ensures zero re-engineering. We supply only factory-certified REM620A_F NAMBBABA33E5BNN1XF units, each validated for all protection functions, arc response timing (<4 ms), and cybersecurity compliance. Every unit undergoes 72-hour burn-in and thermal cycling tests and is backed by a 24-month warranty with global technical support.
Contact us for a customized solution—whether you’re protecting critical motors in oil & gas, modernizing to IEC 61850. or building a predictive maintenance program, the REM620A_F NAMBBABA33E5BNN1XF delivers intelligent, secure, and life-extending motor management where reliability is non-negotiable.
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