Description
I. Product Overview
ABB REM620 NBMNAAAACBC1BNS21G is a dedicated medium and high-voltage motor protection and control IED in ABB Relion® 620 series. Integrated with full functions of motor protection, logic control, electric measurement, condition monitoring and network communication, it serves as the core secondary protection equipment for high-voltage motor circuits in power, chemical, metallurgy and industrial fields. This customized version features differentiated fixed configurations of I/O, communication, power supply and functions, perfectly matching the full-condition operation protection requirements of large and medium-sized motors, and effectively avoiding equipment burnout and production shutdown accidents caused by motor overload, locked rotor, start timeout, grounding faults and phase-to-phase short circuits.
Complying fully with IEC 61850 Edition 2 standard, REM620 supports process bus and gigabit Ethernet communication, with high-precision sampling, millisecond trip response, complete fault recording and event recording capabilities. Adopting industrial wide-temperature hardware and full EMC design, it has passed multiple international safety certifications, adapting to harsh working conditions of long-term continuous operation, strong electromagnetic interference and fluctuating temperature and humidity in switchgears. It is a mainstream core spare part for old motor protection system renovation, new plant motor configuration and redundant system upgrading.
II. Hardware Structure and Composition
1. High-precision Acquisition and Main Control Unit
Equipped with a 32-bit industrial high-speed floating-point processor and multi-channel synchronous AD sampling chip, it synchronously collects and calculates three-phase current, three-phase voltage, zero-sequence current, zero-sequence voltage and temperature signals of motors in real time, accurately obtaining active power, reactive power, power factor, motor starting current and load rate. The built-in dedicated motor protection algorithm library adapts to full working conditions such as motor starting, steady operation, overload and locked rotor, realizing adaptive correction of protection settings and eliminating mal-operation and refusal-operation.
2. Configurable Multi-channel I/O Unit
This customized model is equipped with multiple configurable digital inputs, programmable relay outputs and analog I/O interfaces. DI channels adapt to passive dry contacts for switchgear position, isolating switch status and local control signals. DO relays with large contact capacity can directly drive circuit breaker switching, alarm indicators and local acousto-optic alarms. All I/O points support software configuration for protection tripping, interlock logic, remote signaling upload and remote control output, adapting to various on-site secondary circuit logic.
3. Multi-standard Redundant Communication Unit
Integrated with 10/100Mbps Ethernet and serial communication interfaces, it natively supports mainstream industrial protocols including IEC 61850, Modbus RTU/TCP, DNP3 and IEC60870-5-103, and supports self-healing Ethernet ring network. Dual redundant communication links ensure stable interaction of motor operation data, fault information and remote commands without data loss or remote control failure, enabling seamless connection with substation automation systems, DCS and SCADA platforms.
4. HMI and Status Indication Unit
The front panel is equipped with an LCD screen, physical operation keys and multi-group LED indicators, supporting local real-time display of electrical parameters, protection settings, fault alarms, event records and waveform data. Local parameter modification, setting calibration, loop test and manual switching operation are available. The indicator lights intuitively display operation, alarm, trip, communication abnormality and device fault status, reducing on-site maintenance difficulty.
5. Industrial Power Supply and Protection Unit
It supports wide-range universal AC/DC power supply, with built-in isolated voltage stabilization, surge suppression, over/under voltage and overcurrent short-circuit multi-level hardware protection, resisting grid voltage fluctuation, instantaneous spikes and static interference. Adopting fully enclosed industrial structure and three-proof coating technology, it features excellent vibration resistance and EMC performance, supporting 7×24-hour stable operation in closed, high-temperature, dusty and humid switchgear environments.
III. Technical Specifications
(1) Electrical Parameters
Power Supply: 85～264VAC / 88～140VDC wide-range universal power supply
Measurement Accuracy: ≤±0.2% for current and voltage, ≤±0.5% for power parameters
Protection Operation Time: Millisecond-level trip for main protection, software configurable delay for backup protection
Digital Input: Passive dry contact input with wide voltage recognition
Relay Output: Large-capacity contacts for circuit breaker switching drive, impact and fatigue resistant
Communication Rate: 10/100Mbps adaptive Ethernet, customizable serial baud rate
Fault Recording: Mass sequential event records and fault waveform storage
(2) Environmental Parameters
Operating Temperature: -25℃～+70℃
Storage & Transportation Temperature: -40℃～+85℃
Relative Humidity: 5%～95%RH, non-condensing, free of corrosive gas and conductive dust
EMC Performance: Compliant with highest IEC 61000 industrial EMC standards for static, surge and radiation interference resistance
Certifications: CE, UL, IEC industrial standard certifications
Ingress Protection: IP40 (front panel), for indoor high-voltage switchgear installation
(3) Mechanical Parameters
Mounting Mode: Standard 19-inch cabinet embedded panel installation
Fixing Method: Buckle + screw locking, anti-loosening and anti-vibration structure
Process: Full-device three-proof coating, dust-proof, moisture-proof and aging-resistant
IV. Product Functions and Features
1. Full-coverage Dedicated Motor Protection
It integrates complete motor-specific protection logic, including thermal overload protection, start timeout protection, locked rotor protection, frequent start locking, phase-to-phase short circuit protection, single-phase grounding protection, negative sequence overcurrent protection, over/under voltage protection and motor over-temperature protection, with optional motor differential protection. Covering the whole process of motor starting, operation and shutdown, it avoids major equipment accidents such as motor burnout, insulation breakdown and rotor damage, fully meeting the safety operation specifications of large and medium-sized industrial motors.
2. Integrated High-precision Protection and Measurement
Integrating protection, measurement, control and communication functions, it not only realizes relay protection tripping, but also accurately collects and uploads motor electrical parameters and equipment status to upper systems. It supports remote switching control, remote setting modification and remote signal reset, as well as local manual operation, adapting to intelligent unattended and less-attended plant operation and maintenance modes, and improving the automatic management level of motor circuits.
3. Standard High-compatibility Communication
Natively supporting IEC 61850 V2 substation standard and IEC61850-9-2 LE process bus, it is compatible with traditional protocols such as Modbus, DNP3 and IEC60870-5-103, adapting to both new and renovated intelligent power systems. It supports self-healing Ethernet ring network and dual redundant communication links, eliminating communication interruption, data loss and remote control failure, realizing seamless access to various intelligent substation and industrial automatic control systems.
4. Complete Fault Tracing and Self-diagnosis
The device supports full-process self-diagnosis, real-time monitoring of power supply, sampling, communication and I/O status with instant abnormality alarm. Built-in high-precision fault recording and sequential event recording functions completely record the full-process waveform and action events before, during and after faults, accurately locating fault causes and action sequences, providing complete data support for equipment maintenance, accident analysis and hidden danger troubleshooting.
5. Industrial High-reliability Long-term Operation
Adopting industrial wide-temperature components and fully enclosed three-proof structure with strict EMC tests, it resists strong electromagnetic interference from high-voltage equipment and frequency converters in switchgears, eliminating protection mal-operation and data fluctuation. With excellent MTBF performance and stable operation after parameter setting, it requires low daily maintenance and adapts to continuous industrial production working conditions.
V. Application Scenarios
1. Protection and measurement of high-voltage auxiliary motors (induced draft fan, forced draft fan, feed water pump, circulating water pump) in thermal power and hydropower plants and substations.
2. Protection and monitoring of high-power process motors, compressor motors and pump motors in petrochemical, coal chemical and oil & gas pipeline booster stations.
3. Complete protection and measurement of large fans, crushers and hoist high-voltage asynchronous/synchronous motors in metallurgy, cement and mining industries.
4. Secondary protection device matching for new high-voltage switchgears and intelligent power distribution systems in industrial plants.
5. Upgrading and renovation of old motor protection relays and conventional comprehensive protection devices to improve system intelligence and reliability.
