Description

ABB RED670 1MRK004810-BF

I. Basic Information

ABB RED670 1MRK004810-BF is a high-performance phase-segregated current differential protection IED of the Relion 670 series. Developed specifically for high-voltage (HV) and extra-high-voltage (EHV) transmission lines, it serves as the core main protection equipment for power transmission and distribution systems. Centered on line differential protection, the unit integrates full-line high-speed differential protection, backup overcurrent protection, remote monitoring & control, fault oscillography, event logging, precision metering and digital communication networking. It is applicable to complex transmission topologies including overhead lines, cable circuits, T-connected lines and line-transformer units.

Fully compliant with the IEC 61850 digital substation standard, the device supports IEEE 1588 precision time synchronization, GOOSE high-speed tripping and SV sampled value transmission. Built on a high-performance embedded computing architecture, it features outstanding strengths including rapid differential protection operation, zero-delay internal fault isolation and robust anti-maloperation capability against external faults. Suitable for special operating conditions such as multi-terminal transmission lines, double-breaker arrangements and series-compensated lines, it is widely deployed on HV backbone transmission circuits, cross-regional tie lines, power plant outgoing feeders and substation trunk lines. It fits digital retrofitting of conventional substations, new-build smart substation projects and replacement of obsolete differential relays, fulfilling the 24/7 high-reliability uninterrupted safe operation requirements of power systems.

II. Technical Specifications

(1) Basic Hardware Parameters

Model: RED670 1MRK004810-BF
Brand: ABB (Hitachi Energy)
Device Type: HV Transmission Line Phase-Segregated Current Differential Protection & Control IED
Application Scope: 110kV～500kV HV/EHV transmission lines, overhead/cable feeders, T-type multi-terminal circuits, line-transformer units, grid-connected outgoing lines of power plants, interconnection tie lines between regional grids
Hardware Architecture: Dedicated high-speed differential computing framework of Relion 670 series, consisting of independent differential protection arithmetic unit, high-precision AD synchronous sampling unit and standalone logic control unit
Mounting: Standard 19-inch 3U rack mounting complying with standard power cabinet layout; supports hot-swap module maintenance
Ingress Protection: Overall IP20 industrial rating for dustproof, moisture-proof and anti-interference indoor cabinet installation in substations
HMI: High-definition LCD with programmable function keys for on-site setting configuration, status browsing, fault query and manual switching operation
Overall Dimension: Standard 3U rack footprint with ruggedized industrial construction for long-term power industry service
Core Functions: Main differential protection for HV transmission lines, full-line instantaneous fault clearing, transmission circuit condition monitoring, breaker interlock control, fault root-cause analysis and full-substation digital networking data interaction

(2) Rated Electrical Parameters

Control Supply: Standard DC110V/DC220V auxiliary DC power matching typical substation operating supply with wide input voltage tolerance
Rated Input Current: Dual-rated 1A/5A compatible with mainstream secondary transformation ratios of system current transformers
Rated Input Voltage: 100VAC matching standard secondary output of voltage transformers for HV transmission monitoring
Sampling Accuracy: Analog quantity sampling error ≤±0.2% at metering accuracy grade; supports synchronized sampling alignment across multiple substation sites
Time Synchronization: IEEE 1588 PTP precision sync, IRIG-B and serial time sync to satisfy cross-station synchronous sampling for differential protection
Digital I/O: Multi-channel DI for status acquisition and DO relay outputs to monitor breaker/disconnector position and drive switching commands
Power Consumption: Low-power circuit design with low heat dissipation for long-term continuous cabinet operation

(3) Core Protection Specifications

Phase-Segregated Current Differential Main Protection (87L): Supports 2-terminal to 5-terminal multi-circuit differential protection with line charging current compensation and high-impedance differential logic. Effectively counteracts capacitive charging current interference on long-distance overhead and cable lines and trips instantaneously upon internal faults without intentional time delay.
Adaptive Restraint Differential Logic: Multi-fold restraint functions including steady-state restraint, transient restraint and inrush restraint reliably prevent unintended tripping caused by external faults, heavy load surges and transformer magnetizing inrush with superior anti-interference performance.
Backup Protection Suite: Integrated three-stage overcurrent, zero-sequence overcurrent, overload and undervoltage-blocked overcurrent protection to serve as comprehensive backup for primary differential protection.
Auxiliary Control & Protection: Line auto-reclosing, breaker failure protection, phase fault protection, earth fault protection and adaptive protection for series-compensated equipment.
Protection Operating Characteristics: Instantaneous tripping for in-zone faults and stable restraint for out-of-zone faults with high setting precision and fixed pickup thresholds to satisfy stringent protection criteria of HV transmission networks.

(4) Monitoring, Control & Recording Specifications

Electrical Measurement: Real-time acquisition of three-phase current, three-phase voltage, active/reactive power, power factor, frequency and cumulative energy to support load profiling and operational condition analysis
Switchgear Control Logic: Local manual and remote supervisory closing/tripping of breakers and disconnectors; embedded complete anti-maloperation, on-load interlock and earthing-switch blocking logics
Programmable Logic: Graphical function block programming enabling user-defined interlock, alarm and blocking rules to meet non-standard control requirements of multi-terminal and looped transmission lines
Fault Oscillography: Multi-channel synchronous waveform recording capturing full pre/post-fault traces as well as sequential differential and restraint current data for pinpoint fault localization
Event Logging: Large-capacity non-volatile storage for full audit trail of protection operations, equipment status changes, operator actions, communication exceptions and alarm events

(5) Communication Specifications

Core Protocols: Full compliance with IEC 61850-8-1 MMS, GOOSE and IEC 61850-9-2 SV sampled value protocols
Extended Protocols: Compatibility with legacy power protocols including IEC 60870-5-103, DNP3.0, SPA and LON bus for interoperation between new and existing automation systems
Differential Channel Options: Dedicated fiber-optic path or multiplexed fiber channel with adaptive propagation delay calibration ensuring synchronous cross-site differential sampling
Transmission Performance: Ultra-low communication latency, robust message error correction and automatic channel anomaly supervision to avoid protection malfunctions induced by skewed or lost differential data frames
Networking Capability: Full IEC 61850 substation-wide digital networking enabling seamless connection with SCADA host, dispatch master station, time synchronization system and fault information substation

(6) Environmental Specifications

Operating Temperature: -25℃～+70℃ wide industrial operating range accommodating seasonal ambient fluctuation inside substations
Storage Temperature: -40℃～+85℃ suitable for long-distance shipment and prolonged warehousing
Operating Humidity: 5%～95%RH (non-condensing) to withstand humid sealed cabinet environments
Environmental Robustness: Compliant with high-grade IEC EMC standards; resistant to intensive electromagnetic interference, supply voltage variation, mechanical shock/vibration and thermal ageing
Cooling Method: Passive natural convection fanless cooling for fully maintenance-free operation with zero mechanical failure risks
Pollution Degree: Class 2 industrial pollution rating for typical substation atmospheres with dust and mild corrosive contaminants

III. Key Features

Full-Speed Multi-Terminal Differential Main Protection: Supports phase-segregated differential protection for up to five-terminal transmission circuits, adaptable to T-tapped lines, loop networks and double-breaker topologies. Built-in charging current compensation algorithm eliminates capacitive current disturbance on long-distance feeders to deliver seamless dead-zone-free full-line instantaneous protection.
Multi-Restraint Anti-Maloperation Architecture: Consolidated steady-state, transient, inrush and load restraint logics provide targeted blocking against external short circuits, abrupt load swings, magnetizing inrush and system oscillations, fundamentally eliminating inadvertent tripping of HV line differential protection and securing stable bulk power transmission.
High-Precision Digitally Synchronized Sampling: IEEE 1588 high-precision timing achieves microsecond-level synchronous sampling across geographically separated stations and devices. Paired with high-accuracy AD converters, it delivers precise differential current calculation free of sampling offset to satisfy rigorous accuracy requirements of bulk grid protection.
Integrated Primary & Backup Protection: Combines high-speed differential primary protection with comprehensive multi-type backup functions covering short-circuit, earth fault, overload, undervoltage and equipment failure conditions. Single-device integration replaces conventional multi-relay configurations, simplifying cabinet layout and cutting maintenance expenditure.
Native Full IEC 61850 Digital Networking: Built-in support for GOOSE fast tripping, SV sampled value streaming and MMS data exchange enables bay-level interlocking, rapid fault isolation and real-time data upload across the entire substation, perfectly matching the digital unattended operational architecture of smart substations.
Flexible User-Programmable Logic Expansion: Graphical function block programming allows custom configuration of interlock schemes, alarm thresholds, auto-reclosing sequences and intertrip rules to cater to unique operating requirements of transmission lines with varying voltage classes and topologies.
Rugged Industrial-Grade Long-Term Reliability: Wide ambient operating range, superior EMI immunity and fanless maintenance-free construction enable uninterrupted 24/7 service under harsh HV substation conditions featuring strong electromagnetic fields and extreme temperature swings with minimal failure probability.
Cost-Effective Retrofit & Maintenance: Standard rack footprint permits drop-in replacement of legacy HV differential relays without extensive reworking of primary circuits or cabinet cabling, enabling economical digital and intelligent upgrading of conventional HV substations.

IV. Working Principle

Power-on Initialization & Self-Test: Upon energization of DC control supply, the IED automatically executes hardware circuit self-check, differential sampling channel verification, time synchronization module initialization, protection setting download and communication protocol diagnostics before entering standby monitoring mode once all subsystems pass inspection.
Cross-Site Synchronous Data Acquisition: Guided by IEEE 1588 precision time synchronization, the unit synchronously samples three-phase analog currents/voltages and binary switch status from local and remote line terminals. Embedded digital filtering suppresses electromagnetic noise and sampling clutter to reconstruct authentic field operating parameters.
Real-Time Differential Current Calculation: High-speed processor compares sampled currents from all line ends to compute differential and restraint currents. Charging current compensation and inrush correction algorithms offset measurement errors originating from long-line capacitive effects and transient load disturbances.

Intelligent Differential Protection Decision Logic: Real-time comparison between calculated differential current and programmed pickup setting triggers instantaneous high-speed tripping for internal faults with excess differential current and insufficient restraint; multiple restraint logics activate reliably to block unwanted tripping during external faults.
Supplementary Backup Protection Evaluation: When differential protection remains inactive or faulty, continuous backup protection algorithms (overcurrent, zero-sequence, overload etc.) supervise line operating conditions and initiate backup tripping upon persistent abnormal exceedance to establish dual-layer fault prevention.
Equipment Control & Interlock Execution: Incoming local or remote control commands are validated via anti-maloperation interlock logic; approved instructions trigger breaker/disconnector closing, tripping and auto-reclosing to guarantee safe primary equipment operation.

Bidirectional Digital Data Exchange: Compliant with IEC 61850, the IED exchanges real-time data with substation equipment and dispatch platforms: uploading differential status, fault records, electrical measurements and device health status while receiving remote setting, control and time sync commands for coordinated substation management.
Fault Recording & Routine Operation: Oscillography and event logging activate automatically at fault inception to archive sequential fault data for post-mortem analysis. During normal service, continuous real-time monitoring and data refresh keep protection and communication channels fully primed to sustain long-term secure operation of HV transmission lines.

V. Application Scenarios

(1) Main Protection for HV Trunk Transmission Lines

Extensively deployed on 110kV～500kV HV/EHV backbone feeders as primary line protection to clear in-zone faults instantaneously, isolate severe short-circuit and earth faults rapidly, contain fault propagation to avoid grid collapse and blackouts, and maintain stable bulk power transmission.

(2) Complex Multi-Terminal Transmission Topology Systems

Purpose-built for T-connected circuits, three/five-terminal multi-branch lines, loop networks and double-breaker configured feeders, resolving the limitation of traditional relays unable to accommodate multi-terminal structures and delivering full-range precise protection and operational monitoring for branched transmission networks.

(3) Grid Interconnection & Tie Line Protection

Applied on grid-connected outgoing feeders of thermal, wind and photovoltaic power plants as well as inter-regional tie lines. It accurately monitors interconnection operating conditions, trips faulty grid-connecting circuits promptly, safeguards stable grid-parallel operation of generating units and mitigates grid fluctuation and generator off-grid risks induced by interconnection faults.

(4) Digitalization for New-Build & Retrofitted Smart Substations

Fully aligned with IEC 61850 smart substation digital architecture and supporting fiber networking, GOOSE intertrip and SV sampled value transmission. Suitable for brand-new smart HV substation construction and drop-in replacement of obsolete analog differential relays to realize low-cost digital transformation of legacy conventional substations.

(5) Operation, Maintenance & Dispatch Supervision of HV Transmission Networks

Leveraging high-precision synchronized sampling, stable differential computation and real-time data transmission to deliver accurate line electrical measurements, fault records and equipment status to power dispatch and maintenance platforms, supporting load scheduling, early fault warning, post-fault analysis and setting optimization for intelligent grid management.