Description

ABB REG670 1MRK004826-CE

I. Basic Information

ABB REG670 1MRK004826-CE is a dedicated integrated generator and generator-transformer unit protection & control IED belonging to the Relion 670 series. Developed for thermal, wind, hydro and gas turbine generating units, it acts as the core primary protection equipment for power plant electrical systems. Integrating complete generator fault protection, auxiliary protection for step-up transformers, high-precision electrical measurement, unit operating condition monitoring & control, synchronous paralleling, fault oscillography, event logging and full-digital communication networking functions, the IED independently fulfills full-range protection and management requirements for generators, generator-transformer sets and auxiliary service transformers at power plants.

Designed in full compliance with IEC 61850 smart substation standards, the device natively supports IEEE 1588 precision time synchronization, high-speed intertrip via GOOSE and digital transmission of SV sampled values. Built upon a high-speed parallel computing architecture, it accommodates the operational features of generator sets including drastic load variation, frequent start-stop cycles and volatile operating conditions. Equipped with exclusive generator-oriented protection algorithms such as generator differential, stator earth fault, rotor earth fault, loss-of-excitation, over/under excitation and over/under frequency protection, it delivers high protection accuracy, rapid response and robust anti-maloperation performance. Widely deployed for newly-built intelligent power plants, digital retrofitting of conventional power stations and replacement of obsolete generator protection relays, it satisfies the 24/7 continuous high-reliability safe operation requirements of power generation systems.

II. Technical Specifications

(1) Fundamental Hardware Parameters

Model: REG670 1MRK004826-CE
Brand: ABB (Hitachi Energy)
Equipment Type: Integrated Protection and Control IED for Generators & Generator-Transformer Units
Application Range: Turbo generators, hydro generators, gas turbine generators, wind turbine generators, PV matching generating sets, generator-transformer unit blocks and auxiliary power systems of power plants
Hardware Architecture: High-speed parallel processing framework of Relion 670 series, consisting of independent generator protection computing unit, high-precision AD synchronous sampling unit (32 samples per power cycle) and programmable logic control unit
Mounting: Standard 19-inch 3U rack mounting matching standard relay cabinet layout of power plants; supports hot-swap maintenance of modular components
Ingress Protection: Overall IP20 industrial rating, suitable for dustproof, moisture-proof and anti-EMI environments inside power plant control rooms
HMI: High-definition LCD plus programmable function keys for on-site setting configuration, unit status browsing, fault data inquiry, manual operation and paralleling condition verification
Overall Dimension: Standard 3U ruggedized rack chassis designed for long-term continuous service in power plants
Core Positioning: Full set of primary & backup protection for generators/generator-transformer units, paralleling monitoring & control, high-accuracy operating parameter measurement, fault root-cause analysis, full-plant digital networking interaction and interlock management against abnormal unit conditions

(2) Rated Electrical Parameters

Control Supply Voltage: Standard DC110V/DC220V auxiliary DC power matching conventional plant control supply with wide input voltage tolerance
Rated Input Current: Dual 1A/5A rated design compatible with standard secondary transformation ratios of CTs for generators and step-up transformers
Rated Input Voltage: 100VAC matching standard secondary output of PTs to cover full-range monitoring on both high-voltage and low-voltage sides of generating units
Sampling & Measurement Accuracy: Current/Voltage ≤±0.25%, Active/Reactive Power & Energy ≤±0.5%, Frequency ≤±0.01Hz, complying with metering-grade precision requirements
Time Synchronization: Supports IEEE 1588 PTP precision synchronization, IRIG-B synchronization and serial time sync to guarantee synchronous sampling timing among multiple equipment of the unit
Digital I/O Channels: Multi-channel DI for status acquisition and DO relay outputs to collect position signals and drive switching actions of breakers, disconnectors and unit auxiliary equipment
Power Consumption: Low-power circuit design with low heat dissipation for long-term sealed cabinet continuous operation at power plants

(3) Core Protection Parameters

Main Generator Differential Protection (87G): High-speed phase-segregated generator differential protection with adaptive logic for unit transient conditions, effectively preventing unwanted tripping triggered by unit startup and load fluctuation and instantly clearing internal short-circuit faults without intentional time delay
Stator Earth Fault Protection: Supports stator earth fault detection via low-frequency injection, fundamental zero-sequence component and third harmonic principles, covering 100% of stator winding against single-phase grounding and insulation deterioration for medium & large-sized generators
Rotor Earth Fault Protection: Precisely monitors single-point and two-point earth faults on rotor windings, captures real-time rotor insulation degradation and earthing anomalies to avoid rotor overheating damage and excessive unit vibration
Abnormal Operating Condition Protection: Integrated protection functions including loss of excitation, loss of synchronism, overexcitation, underexcitation, overvoltage, undervoltage, overfrequency, underfrequency and ROCOF protection to comprehensively handle abnormal status during unit paralleling, off-grid, no-load and on-load operation
Backup Current Protection: Three-stage phase overcurrent, zero-sequence overcurrent and negative-sequence overcurrent protection serving as complete backup against external short-circuits, system disturbances and unbalanced load conditions of generators
Special Auxiliary Protection: Supports thermal overload protection, breaker failure protection, start-up/shutdown protection, overfluxing protection and voltage differential protection to provide full-condition coverage for unit startup, steady-state operation and fault scenarios
Protection Operating Characteristics: Instant fault isolation for internal unit faults and reliable restraint against external disturbances, featuring high setting precision and strong anti-load-disturbance capability to fit variable dynamic operating features of generating units

(4) Monitoring, Control & Recording Specifications

Electrical Measurement: Real-time acquisition of generator three-phase currents, three-phase voltages, active/reactive power, power factor, unit frequency, cumulative energy and negative-sequence current to facilitate load statistics and energy efficiency analysis
Unit Control Logic: Local manual and remote supervisory closing/tripping for generator outlet breakers and disconnectors, embedded with complete anti-misoperation interlock, on-load blocking and paralleling interlock logics
Synchronous Paralleling Function: Integrated high-precision synchrocheck, dead-line check and phase-sequence check modules to align paralleling timing accurately, realize smooth shock-free unit synchronization and avoid switching surge damage
Programmable Logic: Graphical function block programming enables customized logics for unit start-stop interlock, fault-triggered shutdown, alarm forwarding and protection switching to satisfy non-standard operation processes of various generator types
Fault Oscillography: Multi-channel synchronous waveform recording to fully archive pre/post-fault waveforms, differential current, negative-sequence current and excitation parameter sequential data for precise fault location and root-cause analysis
Event Logging: Large-capacity storage for full audit trails of protection operations, equipment status changes, paralleling actions, device abnormalities and communication failures

(5) Communication Specifications

Core Communication Protocols: Fully compliant with IEC 61850-8-1 MMS, GOOSE high-speed tripping and IEC 61850-9-2 SV sampled value protocols matching digital architecture of intelligent power plants
Extended Communication Protocols: Supports legacy power protocols including IEC 60870-5-103, DNP3.0, SPA and LON bus to realize interconnection between new and existing plant automation systems
Transmission Performance: Ultra-low communication latency, powerful message error correction and automatic link fault monitoring to ensure stable real-time transmission of critical unit data
Networking Capacity: Enables full-plant IEC61850 digital networking for seamless connection with plant SCADA, master dispatch station, unit DCS, fault information substation and time synchronization system

(6) Environmental Specifications

Operating Temperature: -25℃～+70℃ wide industrial range adapting to seasonal ambient temperature variation in plant control rooms
Storage Temperature: -40℃～+85℃ suitable for long-distance shipment and prolonged warehouse storage
Operating Humidity: 5%～95%RH (non-condensing) to withstand humid and enclosed cabinet environments in control rooms
Environmental Robustness: Conforms to high-level IEC EMC standards with immunity against intensive electromagnetic interference, supply voltage fluctuation and mechanical vibration for harsh plant electromagnetic environments
Cooling Mode: Passive convection fanless cooling with fully maintenance-free design free from mechanical failure risks for continuous long-term unit operation
Pollution Degree: Class 2 industrial pollution rating for typical plant environments with dust and mild corrosive contaminants

III. Key Features

Full-scope Customized Protection for Generating Units: Purpose-built full-set protection algorithms cover all typical unit faults including internal short-circuit, stator/rotor earth fault, loss of excitation/synchronism, over/under excitation, abnormal frequency/voltage and thermal overload; compatible with supplementary protection for generator-transformer blocks and auxiliary transformers to realize full-range unit safety protection with single equipment.
High Anti-Disturbance Adaptive Operating Mechanism: Equipped with adaptive restraint, operating condition identification and disturbance filtering algorithms targeting frequent start-stop, severe load swing, high paralleling surge and frequent system perturbations of generators, preventing inadvertent protection tripping caused by normal dynamic load changes and securing stable unit operation.
High-precision Paralleling Monitoring & Control: Integrated dedicated high-accuracy synchronizing module accurately checks deviation of voltage, frequency and phase angle to achieve smooth surge-free synchronization; equipped with complete paralleling interlock to eliminate severe hazards such as out-of-step paralleling and on-load incorrect switching.
Integrated Primary & Backup Protection Design: Consolidates primary protection, backup protection, auxiliary protection, synchronization control and fault oscillography into one unit, replacing conventional discrete multiple relays, simplifying cabinet layout and cutting equipment maintenance cost and potential fault points.
Full IEC61850 Digital Intelligent Networking: Natively supports GOOSE fast intertrip, SV digital sampling and MMS data exchange for high-speed interaction with plant DCS and all bay-level smart devices, enabling rapid fault isolation, real-time unit status upload and unattended intelligent O&M.
Flexible Customizable Logic Expansion: Graphical function block programming allows users to configure personalized start-stop logic, fault shutdown strategy, graded alarm rules and protection interlock conditions for non-standard processes of thermal, hydro, wind and gas-fired generating units.
Industrial-Grade Long-Term Reliable Operation: Wide-temperature adaptability, superior EMI immunity and fanless maintenance-free construction withstand harsh plant conditions with intensive electromagnetic field and frequent disturbances, ensuring stable 24/7 service and ultra-low failure rate.
Wide Compatibility for Low-Cost Retrofit: Standard rack footprint enables drop-in replacement of legacy discrete generator relays without massive rework on primary circuits and cabinet wiring, applicable for digital & intelligent upgrading of conventional power plants and construction of new smart power stations.

IV. Working Principle

Power-on Initialization & Self-test: After energization of DC control supply, the IED automatically completes hardware circuit self-inspection, sampling channel calibration, protection setting loading, time sync module initialization and communication protocol diagnostics, entering standby monitoring mode once all functional modules pass verification.
Full-dimensional Synchronous Signal Acquisition: Driven by IEEE 1588 precision time synchronization system, the device synchronously samples three-phase analog currents & voltages from generator stator, rotor and step-up transformer together with binary status of breakers, disconnectors and auxiliary equipment; built-in digital filtering eliminates EMI and random noise to restore authentic unit operating data.
Real-time Calculation of Electrical Parameters: High-speed parallel processor dynamically computes core parameters including active/reactive power, power factor, frequency, negative-sequence current and excitation-related values, refreshes load and operating status continuously to realize round-the-clock real-time supervision on generators.
Intelligent Multi-layer Protection Judgement: Continuously compares real-time operational readings against preset protection settings; triggers corresponding primary or backup protection with instantaneous trip and shutdown commands upon detection of internal short-circuit, earthing fault, excitation anomaly, frequency/voltage excursion or unbalanced overload to isolate faulty generating equipment.
Execution of Paralleling & Control Interlock: Incoming local or remote control commands are validated via synchrocheck, dead-line check and anti-misoperation interlock; qualified instructions drive breakers for paralleling or switching operations to strictly avoid out-of-step synchronization and improper switching risks.
Bidirectional Digital Data Communication: Based on IEC61850 standards, the IED exchanges real-time data with plant DCS, SCADA and dispatch systems: uploading protection status, fault records, electrical measurements and device health data while receiving remote setting, remote control and time synchronization orders for coordinated intelligent unit management.
Fault Data Archiving & Root-Cause Analysis: Multi-channel oscillography and event logging activate automatically upon fault inception to store complete pre/post-fault waveforms, action sequences and alarm logs, providing accurate data support for fault troubleshooting, incident analysis, setting optimization and equipment maintenance.
Regular Routine Monitoring: During fault-free operation, the device continuously tracks full-range unit operating parameters and refreshes data to keep protection, control, communication and synchronization functions fully ready for long-term safe, stable and efficient grid-connected operation of generators.

V. Application Scenarios

(1) Inherent Protection for Various Generating Units

Extensively deployed as full-set primary protection for thermal, hydro, gas turbine and wind turbine generators, delivering precise protection against internal short-circuit, insulation failure, excitation anomaly, unbalanced loading and abnormal frequency/voltage, serving as critical guarantee for safe generator operation.

(2) Protection for Generator-Transformer Unit Systems

Suitable for generator-transformer block configuration of medium & large power plants, covering protection and control requirements for generators, main step-up transformers and auxiliary branch equipment; single IED fulfills fault prevention, condition monitoring and interlock control for the whole GT system and simplifies plant protection arrangement.

(3) Plant Synchronization Control and Daily O&M

Relying on high-precision synchronization function, it undertakes core management of generator paralleling, off-tripping and load regulation, optimizes synchronization timing and quality to prevent surge damage to units and power grid, matching regular start-stop and load adjustment requirements of power plants.

(4) Digital Retrofit of Conventional Power Plants

Capable of drop-in replacement for obsolete discrete generator relays and traditional control devices without primary circuit or cabinet reconstruction, enabling cost-effective digital & intelligent upgrading of conventional thermal and hydro power plants to meet unmanned remote O&M demands of smart power stations.

(5) Protection & Control for New Energy Power Station Units

Applicable for grid-connected generators of wind farms, PV plants and energy storage stations; features adaptive accurate protection and stable control targeting high volatility and randomness of renewable generation to ensure safe grid interconnection, steady power output and improved overall reliability of new energy plants.