Description
ABB REF620C_F NCFNAAAAABC2DNN1XF
I. Basic Information
Model：REF620C_F NCFNAAAAABC2DNN1XF
Brand：ABB (Swiss), Relion® 620 series high-end intelligent feeder protection and control IED, dedicated integrated secondary equipment for medium-voltage distribution networks, industrial factory power and new energy distribution systems.
Product Positioning
The REF620C_F is a high-performance integrated intelligent feeder protection and control device of ABB Relion® 620 series, higher-level than conventional 615 series. Designed for 10kV/35kV medium-voltage distribution lines, industrial high-voltage factory power, distributed new energy grid connection and ring network power supply circuits, it integrates full-set relay protection, high-precision electrical measurement, intelligent switch control, fault recording, sequence event recording and high-speed communication networking. Adopting new-generation industrial multi-core operation architecture and full-digital sampling technology, it adapts to complex grid fault conditions and impact load scenarios. It realizes full-range protection against feeder short circuit, grounding, overload, voltage/frequency abnormality and arc faults, while completing electrical metering, load monitoring and automatic remote control. It serves as the core secondary protection and measurement equipment for intelligent substations, distribution network automation and industrial high-risk power distribution systems.
Hardware Architecture
Adopting modular high-density industrial hardware architecture with ABB dedicated power-grade multi-core processor and full-link high-speed AD digital sampling, eliminating temperature drift and zero offset of traditional analog circuits. It integrates multiple independent high-precision voltage/current sampling loops, high-capacity programmable binary I/O matrix, independent hardware fault judgment unit and large-capacity fault recording & event storage unit. The full-isolation strong/weak current partition design integrates multi-level lightning surge suppression, EMI electromagnetic shielding, static protection and filter circuits, ensuring complete electrical isolation of analog, binary and communication loops for strong anti-interference performance in harsh substation electromagnetic environments. Equipped with high-definition full-graphic local HMI, custom function keys and multi-level status indicators, it supports on-site parameter viewing, setting tuning, fault analysis and loop commissioning. Built-in full-range self-diagnosis and fault tolerance mechanisms cover over-temperature, sampling abnormality, bus failure, power anomaly and logic error, supporting long-term heavy-load uninterrupted stable operation.
Mounting Specification
Adopts standard switchgear embedded panel mounting, compatible with universal power cabinet opening sizes for dense layout of new and renovated substation secondary cabinets. The device has passed strict industrial anti-vibration, anti-shock and wide-temperature aging tests, tolerating long-term substation temperature fluctuation, equipment vibration, slight dust and humidity. Front panel high-protection dustproof and moistureproof design with standardized rear partition wiring and separated strong/weak current layout ensures structural anti-loosening reinforcement. It meets the 7×24-hour uninterrupted continuous operation standard and adapts to long-term stable operation of unattended intelligent substations and industrial high-voltage distribution rooms.
Compatible Systems
Fully compatible with intelligent substation automation systems, medium-voltage distribution network automation systems, industrial factory power monitoring systems, new energy station comprehensive protection platforms and power dispatch SCADA systems. It seamlessly connects with upper monitoring background, engineer workstations, data servers, power RTU and PLC automatic control systems. Natively supports full series of power standard protocols including IEC61850, IEC60870-5-103, Modbus TCP/RTU and DNP3, with SNTP network time synchronization and IRIG-B hardware time synchronization. It supports multi-device cluster networking, synchronous data upload, remote setting modification, remote switching and active fault information upload. Widely applied in 10kV/35kV feeders, section switches, tie switches, PV/wind grid-connected feeders, factory high-voltage outgoing lines and metallurgical/petrochemical heavy-load distribution circuits.
Product Characteristics
1. High-end multi-core operation architecture with fast calculation speed and high logic accuracy, enabling precise identification of complex feeder faults, intermittent grounding and transient faults;
2. Full-function integrated protection covering phase fault, grounding, overload, voltage/frequency abnormality, arc fault and breaker failure for all feeder scenarios;
3. Industrial ultra-high measurement accuracy with full electrical parameter precision metering, meeting refined grid monitoring and energy consumption statistics requirements;
4. Full-link electrical isolation and multi-level EMC protection resist strong electromagnetic interference and lightning surges, eliminating protection misoperation, refusal and sampling drift;
5. Multi-protocol high-speed communication and dual-mode time synchronization ensure stable low-latency networking for unattended intelligent grid operation;
6. Large-capacity fault recording and event storage retain complete full-process fault data to support accurate accident traceability and grid operation optimization;
7. Full software programmable configuration enables flexible customization of protection logic, I/O functions and control strategies for multi-scenario renovation and expansion.
II. Technical Specifications
2.1 Electrical Sampling & Protection Parameters
Rated AC input: Secondary voltage 100V, secondary current 1A/5A adaptive, matching standard power transformers;
Rated frequency: 50Hz/60Hz adaptive, compatible with domestic and international power frequency systems;
Measurement accuracy: Three-phase voltage, current, active/reactive power, power factor, frequency and energy meet high-precision power metering standards with zero phase deviation;
Main protection functions: Directional/non-directional overcurrent protection, sensitive earth fault protection, zero-sequence overcurrent protection, transient intermittent earth fault protection, thermal overload protection, over/undervoltage protection, negative-sequence overvoltage protection, frequency abnormality protection, ROCOF protection, arc protection, breaker failure protection and phase discontinuity protection;
Operation performance: Millisecond-level ultra-fast fault response with blind-spot-free judgment and flexible tuning of multi-stage delay, interlock and mutual lock logic;
Binary input: Multi-channel programmable passive inputs for breaker status, energy storage, remote/local mode, disconnector position and various alarm signals;
Binary output: Multi-channel programmable relay outputs for breaker switching, fault alarm, linkage interlock and remote signal output.
2.2 Power Supply & Power Consumption Parameters
Auxiliary power supply: Ultra-wide voltage adaptive DC24/48/110/220V & AC110/220V;
Power consumption: ≤25W in normal operation; low-power design with minimal temperature rise and no long-term heat aging risk;
Power protection: Built-in reverse connection prevention, over/undervoltage self-locking, transient surge suppression and grid fluctuation fault tolerance for complex on-site power conditions.
2.3 Communication & Time Synchronization Parameters
Hardware interfaces: Standard Gigabit Ethernet and RS485 serial port, optional optical fiber port for redundant networking;
Supported protocols: Full compatibility with IEC61850 MMS, IEC60870-5-103, Modbus TCP/RTU and DNP3 Level2+;
Time synchronization: SNTP network time synchronization (primary/backup dual servers) and optional IRIG-B high-precision hardware time synchronization with high station-wide time accuracy;
Remote functions: Supports remote parameter tuning, program upgrade, real-time telemetry upload, remote switching and remote fault reading & analysis.
2.4 Environmental & Protection Parameters
Operating temperature: -40℃～+70℃ ultra-wide temperature operation with stable protection, measurement and communication performance without attenuation or drift;
Storage & transportation temperature: -40℃～+70℃, no circuit aging, parameter deviation or structural deformation during long-term storage;
Operating humidity: 5%～95%RH non-condensing, suitable for enclosed power distribution rooms and constant-temperature central control rooms;
Protection class: Device body IP54, rear wiring area IP20, dustproof and moistureproof for indoor power cabinet installation;
EMC performance: Fully complies with IEC61000 series highest-level power electromagnetic compatibility standards, resisting radiation, conduction, static electricity and surge interference.
2.5 Structural & Physical Parameters
Specification: Standard embedded industrial panel structure compatible with mainstream power cabinet openings;
Weight: Approx. 5.5kg, reinforced anti-loosening structure resistant to long-term vibration;
Mounting method: Standard cabinet embedded fastening installation with accurate positioning and easy assembly for dense cabinet layout;
Material: Flame-retardant and anti-corrosion industrial shell with insulation and aging resistance for long-term power system operation.
III. Key Features
3.1 Full-Coverage High-Precision Feeder Protection for Complex Grid Faults
Adopting ABB new-generation feeder dedicated protection algorithm, the device covers all common and complex feeder faults, accurately identifying permanent short circuits, intermittent grounding, transient grounding, load impact and three-phase unbalance. It supports directional judgment, zero-sequence judgment, graded interlock and auto-reclosing logic to effectively distinguish internal faults and external interference, completely eliminating protection misoperation and refusal. Millisecond-level ultra-fast tripping isolates faulty feeders instantly, minimizing power outage scope and ensuring safe and stable operation of power grids and terminal equipment, adapting to complex scenarios such as industrial heavy load, new energy grid connection and ring network power supply.
3.2 Full Electrical Precision Measurement & Control for Smart Grid Lean O&M
High-speed high-precision AD sampling and digital operation algorithms collect full three-phase electrical parameters in real time, accurately calculating active/reactive power, energy consumption, load curve and frequency trend. The measurement accuracy meets grid metering standards, replacing traditional pointer meters and multi-function measurement devices. It realizes integrated feeder protection, measurement and metering in one device, simplifying cabinet configuration, reducing infrastructure and operation costs and supporting grid energy consumption statistics, load analysis and lean operation.
3.3 Local & Remote Dual Control for Unattended Automatic Operation
Supports local panel manual operation and background remote telecontrol dual modes for breaker manual/remote switching, real-time status monitoring and equipment inspection. Equipped with complete encrypted operation authority, remote control interlock and operation log functions to eliminate manual misoperation risks. Compatible with mainstream intelligent substation and distribution network automation platforms, it realizes automatic fault location, isolation and line self-healing recovery, fully adapting to unattended intelligent substation operation requirements.
3.4 Large-Capacity Fault Recording & Complete Event Traceability
Built-in high-capacity non-volatile storage retains massive long-term fault waveform data, protection action events, alarm records, operation logs and full-sequence operation data. It accurately records full-process waveforms, action sequences and parameters before and after faults, supporting background waveform analysis and accident review. It provides accurate data support for grid fault troubleshooting, hidden danger treatment, protection setting optimization and grid operation adjustment, greatly improving power operation efficiency and fault disposal capability.
3.5 Ultra-Wide Temperature & High Anti-Interference for Harsh Power Conditions
The integrated protection design of full-loop electrical isolation, multi-level surge suppression and full-range electromagnetic shielding passes the highest-level power EMC tests, effectively resisting strong electromagnetic interference from substation high-voltage equipment, inverters and switch operations. Adopting fully digital operation architecture without mechanical wearing parts, it operates stably at -40℃～+70℃ ultra-wide temperature range without parameter drift or logic disorder under high/low temperature, humidity and vibration conditions, with excellent environmental adaptability and operational stability.
3.6 Programmable Modular Configuration with Strong Expandability for Various Renovations
Adopting full software programmable modular architecture, protection logic, control strategy, I/O definition, communication parameters and time synchronization modes can be flexibly configured via software without hardware modification. It adapts to ordinary feeders, ring network feeders, new energy grid connections and industrial heavy-load circuits, compatible with old substation renovation, new intelligent substation construction and industrial distribution automation upgrading with outstanding universality and flexibility.
IV. Working Principle
The ABB REF620C_F NCFNAAAAABC2DNN1XF feeder protection and control device realizes medium-voltage feeder protection, measurement, control, recording and intelligent networking based on core mechanisms of high-speed full-digital sampling + multi-dimensional intelligent fault judgment + graded protection linkage + high-precision data interaction + full-sequence event recording.
After power-on, the device automatically completes full hardware self-inspection, sampling calibration, communication initialization, protection parameter loading and time synchronization, and enters real-time monitoring standby status after passing self-check. Analog signals from voltage and current transformer secondary circuits are converted into high-precision digital data via high-speed AD conversion. The core processor calculates and analyzes electrical amplitude, phase, frequency, load trend and sequence component characteristics in real time, and synchronously collects binary signals such as breaker position, local/remote status and equipment alarms to complete full-data real-time monitoring.
Under normal grid operation, the device continuously performs high-precision electrical measurement, load statistics, status monitoring and real-time data upload, maintaining stable two-way data interaction with upper background and dispatch platforms. When feeder faults such as short circuit, grounding, overload, voltage/frequency abnormality and arc fault occur, the device quickly compares real-time sampling data with preset protection fixed values and logic thresholds to accurately judge fault type, area and level, outputs tripping signals according to tuned time limit and interlock logic to drive breaker opening and isolate faults. Meanwhile, it locks fault data, records full-process waveforms and action sequences, and actively uploads fault alarm information.
The device supports local manual operation and remote background telecontrol for parameter modification, setting tuning, switching control and program upgrade. Real-time full hardware self-inspection is implemented during operation, actively alarming and locking abnormal logic for hidden dangers such as sampling abnormality, communication interruption, power failure and hardware defects, fully ensuring safe, stable and intelligent operation of the feeder system.
V. Application Scenarios
1. 10kV/35kV urban distribution network projects: Protection, measurement, fault self-healing of urban cable/overhead feeders, ring network lines and section/tie switches;
2. Industrial factory power systems: Comprehensive protection and automatic measurement & control for high-voltage outgoing lines, bus couplers and section switches in petrochemical, metallurgical and manufacturing industries;
3. New energy grid-connected systems: Feeder protection, anti-islanding, fault monitoring and grid-connected safety control for distributed PV and wind farms;
4. Intelligent substation construction and renovation: Integrated protection & measurement and old comprehensive protection equipment upgrade for feeder bays of medium and small intelligent substations;
5. Large park and transportation hub distribution systems: High-voltage distribution safety protection, energy consumption monitoring and automatic intelligent operation management;
6. Industrial heavy-load power distribution systems: High-voltage feeder protection for impact load and heavy-load production lines, adapting to complex and harsh industrial power conditions.
