I. Basic Information

ABB REC670 1MRK002814-AC is a high-performance bay-level measurement and protection Intelligent Electronic Device (IED) of the Relion 670 series. Developed for bay equipment of high-voltage and medium-voltage substations in power systems, it integrates relay protection, precision measurement, real-time monitoring & control, logic interlocking, fault oscillography, event logging and communication networking into one unit, serving as the core bay-layer device of Substation Automation System (SAS). Fully compliant with the IEC 61850 international power communication standard, it adopts a full-digital embedded control architecture featuring powerful computing performance, high sampling accuracy and wide adaptability to diverse operating conditions.

II. Technical Specifications

(1) Basic Hardware Parameters

• Model No.: REC670 1MRK002814-AC
• Brand: ABB
• Equipment Type: Bay Measurement & Protection Intelligent Electronic Device (IED) for Substation Application
• Applicable Fields: Bay control and protection for HV/MV substations, industrial captive power plants, industrial power distribution systems, transmission & distribution feeder bays
• Hardware Architecture: High-performance embedded digital computing framework equipped with high-precision AD sampling module and independent logic operation unit
• Mounting: Standard 19-inch rack mounting matching standard layout of power cabinets; hot-swap enabled for module maintenance
• Ingress Protection: IP20 (standard protection for indoor power cabinet installation)
• HMI: Onboard high-definition local LCD plus programmable function keys for on-site parameter checking, setting and equipment operation
• Overall Dimension: 420mm × 290mm × 180mm
• Net Weight: Approx. 9.0kg with ruggedized industrial cabinet construction
• Compliance Standards: IEC 60255 for electrical equipment, IEC 61850 for substation communication, CE & UL industrial certification

• Core Application: Bay relay protection, electrical parameter measurement, equipment logic control, grid fault monitoring & recording, full-station communication and data interaction

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(2) Rated Electrical Parameters

• Control Supply Voltage: Standard DC110V/DC220V power supply; optional DC24V/DC48V for non-standard power supply scenarios
• Rated Input Current: Dual rating 1A/5A compatible with conventional CT transformation ratios in power industry
• Applicable System Voltage: Covers full-range 690V～500kV transmission & distribution bays with customizable parameter configuration
• Analog Sampling Accuracy: ≤±0.2% high-precision metering-grade sampling with extremely low steady-state measurement error
• Digital Channel Configuration: Multi-channel DI/DO terminals for field switch status acquisition and breaker switching control output

• Power Consumption: Optimized low-power circuitry with low standby and operational power loss for long-term continuous cabinet operation

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(3) Protection Function Specifications

• Voltage Protection: Two-stage overvoltage protection, two-stage undervoltage protection, voltage differential protection and loss-of-voltage detection to cope with various grid voltage abnormalities
• Frequency Protection: Under-frequency, over-frequency and df/dt protection to prevent equipment damage and system instability caused by grid frequency deviation
• Current Protection: Overcurrent, directional overcurrent and earth fault protection enabling fast isolation of short-circuit, overload and ground faults on feeders
• General Protection: Integrated combined overcurrent & undervoltage protection for monitoring and safeguarding against complex composite grid faults

• Protection Performance: Fast fault response, accurate pickup setting and comprehensive anti-maloperation interlock logic for superior protection reliability

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(4) Recording & Control Performance Parameters

• Fault Oscillography: Synchronous waveform recording for 40 analog channels and 96 digital channels to fully capture full-cycle fault waveform data
• Event Logging: Large-capacity event memory enabling full traceback of equipment operations, protection tripping actions and status changes
• Energy Metering: Precise active/reactive energy calculation, peak demand statistics and pulse output for energy measurement
• Control Logic: Local/remote open/close control for breakers and disconnectors with complete equipment interlock and anti-misoperation logic

• Data Refresh Rate: High-speed real-time refresh of electrical parameters without data delay to satisfy dynamic grid monitoring demands

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(5) Environmental Specifications

• Operating Temperature: -25℃～+70℃ wide industrial operating range adapting to seasonal temperature variation inside power stations
• Storage Temperature: -40℃～+85℃
• Operating Humidity: 5%～95%RH (non-condensing) for moderately humid indoor environments
• Environmental Resistance: Designed per IEC industrial standards with high immunity to EMI, mechanical shock, ambient temperature swing and long-term aging
• Cooling Mode: Passive convection cooling with fanless maintenance-free design eliminating potential mechanical failure risks
• Pollution Degree: Class 2 industrial pollution protection suitable for dusty and humid indoor substation environments

III. Key Features

• All-in-one Integrated Protection & Control: Single-device design consolidates seven core functions: relay protection, electrical measurement, equipment control, logic interlock, fault oscillography, event logging and energy metering. It replaces conventional discrete multi-module solutions to realize compact cabinet layout and lower maintenance cost.
• Metering-class High-precision Sampling: Adopts high-accuracy AD conversion algorithm achieving ±0.2% V/I sampling precision to accurately collect grid voltage, current, power, frequency and energy data, satisfying strict accuracy requirements of power dispatching, metering and supervision.

• Comprehensive Grid Fault Protection: Full-spectrum protection logic covering voltage, frequency, current and earth faults with multi-stage setting configuration and anti-maloperation interlock to rapidly identify and isolate various abnormal faults and secure transmission lines and primary equipment.

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• Standard IEC61850 Digital Communication: Fully compatible with IEC61850 substation communication protocol to support full-station digital networking and seamless connection with background SCADA and dispatching platforms, realizing real-time data upload, remote parameter setting and remote equipment control in line with smart substation construction criteria.

• Robust Anti-misoperation Interlock Logic: Dedicated interlock algorithm customized for breakers and disconnectors supports both local keypad operation and remote background control to avoid hazardous maloperations such as unintended switching, opening under load and closing with earthing switch closed.

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• Full-life-cycle Fault Data Traceability: Ample memory for fault waveform and event log storage completely archives fault waveforms, action sequences, equipment status and operation records to support post-fault analysis, accident investigation and parameter optimization.
• Industrial-grade Long-term Stable Operation: Wide-temperature tolerance, superior EMI immunity and fanless maintenance-free construction enable steady 7×24-hour continuous operation under harsh substation environments with strong electromagnetic interference and drastic temperature fluctuation and extremely low failure rate.
• Easy Installation & Cost-effective Upgrade: Standard rack mounting and hot-swap maintenance enable drop-in replacement for legacy substation bay devices without extensive cabinet rewiring or modification, realizing low-cost digital and intelligent retrofitting of conventional substations.

IV. Working Principle

1. Power-on Initialization & Self-test: After control power is energized, the unit automatically executes hardware circuit self-inspection, sampling channel calibration, communication protocol initialization, protection parameter loading and HMI self-check, and switches to standby monitoring mode once all items pass verification.
2. Real-time High-precision Signal Acquisition: Continuously samples analog and digital signals including bay voltage, current, frequency and switch status; built-in filtering and calibration algorithms eliminate field EMI noise to restore authentic grid operating data.

3. Real-time Condition Monitoring & Parameter Calculation: The high-speed processor computes active/reactive power, energy and power factor in real time while tracking grid voltage/frequency variation and equipment running status to implement full-bay real-time supervision.

1. Intelligent Protection Logic Judgment & Tripping: Continuously compares real-time operating values against preset protection thresholds; upon detection of overvoltage, undervoltage, overcurrent, frequency excursion or earth fault, protection logic triggers immediately to output trip command for faulty circuit isolation and fault status latch-up.

2. Interlock-based Equipment Control Execution: Upon receiving local or remote control commands, the unit verifies operation validity via pre-configured anti-misoperation interlock logic and executes breaker/disconnector switching only after compliance check to avoid improper operation and protect primary assets.

1. Digital Communication & Data Exchange: Interacts with substation SCADA and dispatching system via IEC61850 to upload measured data, equipment status and fault information, meanwhile downloading remote parameter settings and remote control instructions for coordinated full-station digital management.
2. Automatic Fault Recording & Event Storage: Triggers oscillography instantly upon grid fault or equipment status change to record pre/post-fault waveforms and event sequences; operation logs and fault codes are saved for subsequent fault tracing and performance analysis.
3. Normal Steady-state Monitoring: Under fault-free conditions, the device keeps tracking grid and equipment status, dynamically refreshes operating data and maintains ready status of protection, control and communication links to guarantee long-term safe operation of substation bays.

V. Application Scenarios

(1) Bay Protection & Control for Smart Substations

Extensively applied on feeder bays, busbar bays and transformer bays of HV/MV smart substations to perform core bay-layer tasks including relay protection, real-time control, parameter monitoring and data upload in compliance with IEC61850 digital networking specifications for reliable intelligent substation operation.

(2) Captive Power Plants for Industrial & Mining Facilities

Designed for bay control and protection of factory-owned power stations, waste heat power plants and distributed energy plants. It precisely monitors grid-connected and distribution operating status, quickly clears system faults and stabilizes system voltage and frequency to ensure safe grid interconnection and uninterrupted power supply against unexpected production blackouts.

(3) Industrial Transmission & Distribution Automation Systems

Deployed on high-voltage power distribution networks for metallurgy, chemical and petrochemical industries to deliver full-set protection and control for feeders, high-voltage switchgears and primary equipment, adapting to heavy load fluctuation, complex working conditions and severe EMI for consistent industrial power supply.

(4) Data Monitoring System for Power Dispatching

Delivers accurate real-time grid electrical and equipment status data to dispatching platforms with high-precision measurement and digital communication, fulfilling business requirements of grid supervision, load statistics, energy assessment and fault early warning for intelligent power dispatching management.

(5) Intelligent Retrofit & Maintenance of Legacy Substations