I. Basic Information
Model：REL670 Version 2.2 (Relion® 670 Series Line Distance Protection IED)
Brand：ABB
Product Positioning
The ABB REL670 V2.2 is a professional high-voltage transmission line distance protection and control IED. Designed for 110kV and above high-voltage overhead lines, cable lines, ring network lines and double-breaker wiring lines, it integrates distance protection, full-line high-speed protection, backup overcurrent protection, voltage/frequency monitoring, fault recording, local measurement and control, and communication networking. As an officially upgraded iteration version, Version 2.2 optimizes IEC 61850 protocol adaptation, network redundancy, time synchronization accuracy and sampled value transmission performance. It serves as the core main protection device for power grid transmission and distribution, industrial self-provided power stations, rail transit power supply and petrochemical self-provided power plants, fully complying with IEC, IEEE and domestic power industry relay protection specifications.
Hardware Architecture
Adopting Relion series standardized modular hardware architecture, the device is equipped with an industrial multi-core power-dedicated processor, high-precision AD synchronous sampling unit, independent analog signal conditioning loop, programmable logic operation unit and redundant Ethernet communication module. It integrates multi-channel AC voltage/current analog input, binary input/output, programmable signal relays and local HMI operation panel. The full electrical isolation design of analog loop, switch loop, communication loop and power loop provides strong resistance to interference, surge and electromagnetic pulse. V2.2 hardware is fully compatible with 670-series backplanes and expansion cards, supporting on-demand function expansion and adapting to complex wiring and multi-layer protection logic configuration.
Mounting Specification
Adopting standard cabinet embedded panel mounting, it fits standard power relay cabinet opening dimensions with firm installation and regular wiring. The integrated design eliminates the need for external auxiliary protection modules, reducing cabinet equipment quantity and wiring complexity. It supports automatic power-on self-test, bus identification and parameter adaptation, as well as non-stop remote parameter modification and logic commissioning, adapting to new substation assembly, old substation protection renovation, line protection expansion and old version program upgrading scenarios.
Compatible Systems
Fully compatible with ABB Relion® 670 series configuration software and operation & maintenance platforms, as well as SCADA monitoring systems, substation integrated automation systems and power dispatching master stations. Version 2.2 natively supports IEC 61850-9-2LE process bus sampled values, HSR network redundancy and IEC/IEEE 61850-9-3 high-precision time synchronization, enabling seamless access to smart substation digital networking. It is also compatible with traditional 4-20mA, hard contact remote signaling/control and serial communication, adapting to digital upgrading of new smart substations and conventional substations.
Product Characteristics
With high-precision impedance measurement algorithm, it realizes full-line high-speed distance protection with excellent selectivity and rapidity, ensuring reliable operation for internal faults and no maloperation for external disturbances. V2.2 significantly improves process bus sampling stability, clock synchronization accuracy and Ethernet communication reliability. Integrated with complete main and backup protection logic, it fully covers main protection, near backup and remote backup of lines, adapting to single/three-phase tripping, T-connection lines and multi-terminal line topologies. Built-in large-capacity event recording and fault recording support full-process fault review for power system fault analysis and compliance traceability. The industrial reinforced hardware operates stably under strong electromagnetic interference, temperature and humidity fluctuation and long-term uninterrupted operation conditions.
II. Technical Specifications
1. Core Protection Functions
Distance Protection: 4-stage distance protection (Zone1/Zone2/Zone3/Zone4) with flexible impedance, reactance and resistance setting, adapting to high-voltage transmission lines of different lengths and topologies. It accurately identifies inter-phase faults, grounding faults, high-resistance grounding and cross-region faults with no blind protection area, realizing millisecond-level high-speed tripping for internal faults.
Backup Protection: Integrated directional overcurrent, non-directional overcurrent, zero-sequence overcurrent and negative-sequence overcurrent multi-level backup protection, serving as reliable backup after main protection failure to avoid skip tripping and grid fluctuation. It supports overload alarm, overload blocking and abnormal condition monitoring for refined steady-state line condition control.
Auxiliary Electrical Protection: Integrated overvoltage, undervoltage, overfrequency, underfrequency and frequency slip protection, adapting to grid voltage fluctuation, frequency abnormality and grid-connection instability. It supports voltage loss judgment, load mutation monitoring and line charging state identification, covering full working conditions of no-load, closing, grid-connection and disconnection.
2. Communication & Protocol Specifications
Ethernet Communication: Version 2.2 adopts upgraded multi-port redundant architecture and supports HSR high-reliability network redundancy technology to avoid communication interruption caused by single network failure, meeting dual-network redundant networking requirements of smart substations. It natively supports IEC 61850 MMS and IEC 61850-9-2LE process bus SV sampling and GOOSE tripping networking.
Time Synchronization: Supports IEC/IEEE 61850-9-3 high-precision time synchronization protocol with significantly improved synchronization accuracy, ensuring unified millisecond-level timing for all station equipment and accurate time sequence alignment of fault recording and event records.
Compatible Protocols: Compatible with traditional IEC103, IEC104, Modbus and other conventional power communication protocols, enabling seamless connection between new and old substations with strong networking adaptability.
3. Sampling & Recording Specifications
Sampling Performance: High-precision synchronous AD sampling for three-phase voltage and current with minimal phase error, ensuring accurate impedance measurement, power calculation and fault judgment. It supports dual-mode adaptation of digital process bus sampling and traditional analog sampling, compatible with electronic and conventional electromagnetic transformers.
Fault Recording: Built-in high-capacity fault recording unit supports multi-channel synchronous recording of full-process waveforms before, during and after faults. The recording format is compatible with standard COMTRADE for direct fault analysis and review.
Event Recording: Mass timestamped event storage fully records protection actions, switch displacement, communication status, parameter modification and equipment self-check faults, supporting daily operation, fault traceability and power compliance acceptance.
4. Electrical & Power Specifications
Operating Power Supply: Standard power DC operating power (DC110V/DC220V adaptive) with wide voltage range, resisting DC power fluctuation and ripple interference, suitable for substation DC screen power supply. Low power consumption and heat generation support long-term closed cabinet operation.
Analog Input: Adapts to standard PT/CT secondary rated values, collecting three-phase AC voltage, current, zero-sequence current and zero-sequence voltage with high precision for full-dimensional line electrical monitoring.
Binary Input/Output: Multi-channel programmable passive input and relay output support remote switching, signal alarm, interlock linkage and remote control. The contact capacity meets secondary circuit standards with reliable action and strong anti-interference capability.
5. Environmental Specifications
Operating Temperature：-25℃～+70℃, stable protection logic, sampling accuracy and communication performance in the full temperature range, adapting to alternating high and low temperature conditions of outdoor substations and closed cabinets.
Storage Temperature：-40℃～+85℃, no program loss, hardware aging or parameter drift during long-term storage.
Operating Humidity：5%~95% RH, non-condensing, adapting to humid, dusty and slightly corrosive substation environments without insulation degradation, circuit leakage or communication abnormality.
Condition Adaptation: Passed the highest-level EMC electromagnetic compatibility test of power industry, resisting long-term substation switching surge, high-frequency electromagnetic radiation, static impact and grid disturbance. Protection Grade: Front IP54, body IP20, fully meeting indoor installation protection standards for power relay cabinets.
III. Key Features
1. High-Precision 4-Stage Distance Protection with Full Line Fault Coverage
Equipped with optimized impedance measurement algorithm, REL670 V2.2 features accurate 4-stage distance protection zoning and excellent operation selectivity, accurately distinguishing internal faults from external disturbances to avoid maloperation and refusal. It has strong identification capability for inter-phase short circuit, single-phase grounding, cross-section faults and high-resistance grounding faults of transmission lines, adapting to overhead lines, cables, T-connection lines and ring network topologies. It realizes full coverage of main protection for high-voltage lines with millisecond-level high-speed tripping, minimizing fault impact scope and ensuring grid stability.
2. Exclusive V2.2 Upgrades with Enhanced Digital Adaptability
Compared with old versions, Version 2.2 focuses on upgrading digital networking capability. It fully supports IEC 61850-9-2LE process bus sampling for smart substation digital networking; adds HSR network redundancy to eliminate communication interruption and data loss caused by single network failure; upgrades IEC/IEEE 61850-9-3 precise time synchronization to unify full-station timing and greatly improve the accuracy of fault analysis and event traceability, serving as the preferred upgraded version for smart substation line protection iteration.
3. Integrated Main & Backup Protection with Reliable Logic
Integrated with complete functions of distance main protection, directional overcurrent, zero-sequence protection, voltage/frequency abnormality protection and overload monitoring, the single device completes dual main and backup line protection without auxiliary devices, simplifying secondary circuit architecture. It supports customizable protection blocking, linkage logic and tripping modes, adapting to various reclosing strategies to match grid operation modes, effectively preventing fault expansion, skip tripping and grid oscillation risks.
4. Powerful Recording & Traceability for Compliant O&M
The high-standard fault recording and mass event storage fully record fault waveforms, electrical changes, protection action timing and operating status. Compatible with general power analysis software, it enables rapid fault cause review, hidden danger positioning and parameter optimization. All data and events carry precise timestamps, meeting power safety supervision, acceptance and account compliance requirements, supporting full-life-cycle refined substation operation and maintenance.
5. Strong Anti-Interference & Wide Condition Adaptability
The full-isolation hardware design passes the highest-level electromagnetic compatibility test, resisting complex substation interference such as knife switch operation, switch tripping, frequency converter interference and strong electromagnetic radiation. Wide temperature, voltage and humidity adaptability suits various regional climatic and substation environments, supporting 7×24-hour uninterrupted stable maintenance-free operation with ultra-low failure rate for unattended grid operation scenarios.
IV. Working Principle
The ABB REL670 V2.2 line distance protection device operates based on impedance ranging principle + intelligent electrical quantity judgment logic. It collects real-time three-phase voltage and current analog quantities of lines, calculates real-time line impedance, and judges fault intervals by comparing with preset setting thresholds to realize accurate protection tripping and condition monitoring. The overall workflow includes five core links: signal acquisition, data operation, fault judgment, logic output and data storage.
The high-precision AD sampling unit synchronously collects PT/CT secondary three-phase voltage and current signals, which are isolated, filtered and shaped before transmission to the core processor. The processor calculates core electrical parameters such as line impedance, reactance, resistance, power and phase in real time, and accurately judges fault location, type and severity by comparing with 4-stage distance protection zoning thresholds.
Meanwhile, the device adopts multi-verification through backup protection logic, voltage/frequency monitoring logic and network time synchronization logic to eliminate misjudgment and omission. When internal faults are confirmed, it outputs tripping relay signals in milliseconds to open the circuit breaker and isolate faulty lines; if main protection refuses to operate, backup protection delayed tripping is automatically activated for dual protection. The device synchronously records waveform and event data, uploads to the background via IEC61850 protocol, and forms a full closed-loop of fault early warning, rapid protection, data traceability and remote management.
V. Application Scenarios
1. High-Voltage Transmission Line Main Protection: Used as core main and backup protection for 110kV and above high-voltage overhead transmission lines, power cable lines and ring network tie lines to ensure grid operation stability.
2. Smart Substation Digital Renovation: Adapts to new smart substation construction and conventional substation digital upgrading relying on V2.2 improved IEC61850 digital networking capability, meeting process bus sampling, network redundancy and precise time synchronization requirements.
3. Industrial Self-Provided Power Station System: Applied to high-voltage outgoing lines and factory tie lines of petrochemical, metallurgical, coal mining and large industrial self-provided power stations to isolate faults and prevent grid disturbance diffusion.
4. Rail Transit & Municipal Power Supply Lines: Suitable for rail transit traction power supply lines and municipal core high-voltage distribution lines to guarantee power supply continuity and public safety.
5. Old Protection Equipment Replacement: Directly replaces old line protection devices without major secondary circuit modification, realizing low-cost protection system upgrading, function expansion and performance optimization to meet latest power operation compliance standards.
