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ABB REU615E_D (Order No.: HBUAEAADNCA1BNN1XD) is a digital voltage protection and control relay, belonging to the core protection and control devices of the ABB RELION® 615 series.Different from the REF615E_E feeder protection relay, REG216 digital generator protection system, 216EA61b digital input module, 216AB61 composite I/O module and AC-PIN-51 current measurement board, its core advantage is specialized in comprehensive voltage protection, precise control and intelligent monitoring for medium and low-voltage distribution networks.Integrating advanced voltage monitoring algorithms and programmable logic control technology, it is designed for industrial power distribution, commercial building power distribution, new energy power stations and municipal public utilities.It provides full-dimensional voltage protection including overvoltage, undervoltage and voltage unbalance, as well as control functions such as voltage regulation and backup power switching.It is key equipment to ensure voltage stability and safe operation of equipment in distribution networks.
I. Product Positioning
ABB REU615E_D (Order No.: HBUAEAADNCA1BNN1XD) is used for voltage monitoring, fault protection and operation control in medium and low-voltage distribution networks (phase voltage 220V/110V AC, line voltage 380V/220V AC).It is widely applied in industrial power distribution systems, commercial complex distribution rooms, new energy power stations (PV, wind power), municipal public utilities (sewage treatment plants, pumping stations) and other scenarios.It undertakes the core functions of real-time system voltage monitoring, voltage anomaly identification, rapid protection operation and coordinated equipment control.It can accurately detect various voltage-related faults such as overvoltage, undervoltage, voltage unbalance, overfrequency and underfrequency.It prevents equipment damage through alarm or tripping operations, and realizes functions including voltage regulation, backup power switching and logic interlock control, providing strong support for improving power quality and lean management of distribution networks.
The device adopts a high-performance core chip and modular hardware architecture, and is seamlessly compatible with smart distribution monitoring systems (SCADA), distribution automation platforms and various ABB power distribution equipment.Compared with traditional voltage relays, it features flexible programmable protection logic, high measurement accuracy, comprehensive control functions and abundant communication interfaces.Different from feeder protection (such as REF615E_E), generator protection systems (such as REG216) and pure I/O or measurement modules, it focuses on dedicated voltage protection and control, integrating protection, monitoring, control and communication in one unit.No additional auxiliary modules are required, which greatly improves the intelligence level and operation & maintenance efficiency of voltage management in distribution networks.It adapts to various power supply topologies such as single power supply and dual power supply, and meets the voltage management requirements of new energy grid-connected scenarios.Mean time between failures (MTBF) is more than 100,000 hours.
II. Technical Parameters
| Item | Specification |
|---|---|
| Type | REU615E_D |
| Order No. / Material Code | HBUAEAADNCA1BNN1XD |
| Equipment Type | Industrial-grade digital voltage protection and control relay, ABB RELION® 615 series, Intelligent Electronic Device (IED) |
| Applicable Voltage Level | Phase voltage: 220V/110V AC; Line voltage: 380V/220V AC; wide input voltage range supported |
| Voltage Measuring Range | 0–1.2 × rated voltage, measurement accuracy ±0.5% |
| Rated Frequency | 50Hz/60Hz, auto-detectable or manually set |
| Protection Operating Time | Minimum operating time ≤ 50ms; delay time (0–30s) configurable as required |
| Electrical Isolation | Full galvanic isolation between input, output and communication circuits, effectively blocking electromagnetic interference and ensuring stable operation |
| Power Supply | Wide-range AC/DC power supply: 48–250V DC / 100–240V AC, power consumption |
| Operating Temperature | -25℃ ～ +70℃, humidity: 5%–95% (non-condensing), suitable for harsh indoor and outdoor environments |
| Storage Temperature | -40℃ ～ +85℃ |
| Protection Class | Front panel IP54, unit IP20 (for cabinet mounting, dustproof and touch-proof) |
| Dimensions (approx.) | Approx. 200mm × 250mm × 300mm, compact design, supports 35mm standard DIN rail mounting or flush panel mounting |
| Weight (approx.) | Approx. 2.5kg, modular structure for easy installation and maintenance |
| Terminal Type | Industrial-grade screw terminals, suitable for power cables and control signal wires, reliable contact, anti-loosening and convenient wiring |
| Communication Interface | Standard RS485 (supports Modbus RTU), IEC 61850 supported; 2 × RJ45 ports for remote monitoring, setting adjustment and fault data upload |
| Contact Rating | Output contacts: AC 250V/5A, DC 24V/10A; multiple NO/NC contact configurations supported |
| Key Features | Multi-type voltage protection, voltage regulation control, programmable logic, fault monitoring & alarm, remote management, high anti-interference, modular configuration, RoHS compliant, compatible with RX3I and RX7I controllers |
III. Core Functions
1. All-round Voltage Fault Protection
Integrates a complete set of voltage protection functions to build a multi-dimensional voltage protection system, preventing equipment damage caused by voltage anomalies in all aspects.Overvoltage protection supports multi-level thresholds according to system characteristics; when voltage exceeds the set value, it quickly triggers an alarm or trip to avoid damage to transformers, motors and other equipment due to insulation breakdown or core saturation.Undervoltage protection acts promptly when voltage is below the safe range, preventing motor stalling and insufficient output, and can cooperate with automatic transfer switches (ATS) for fast power switching to ensure continuous operation of critical loads.Voltage unbalance protection monitors three-phase voltage balance in real time; when deviation exceeds the set value (e.g., phase loss, sudden rise/fall), it immediately alarms and takes protective actions, suitable for loads sensitive to three-phase balance.Overfrequency/underfrequency protection indirectly reflects voltage stability by monitoring system frequency, suitable for isolated grids or new energy grid-connected scenarios to prevent voltage cascading failures caused by frequency collapse.
2. Precise Voltage Regulation and Control
Provides complete voltage control functions and can cooperate with on-load tap-changing transformers, SVG and other voltage regulation equipment.It automatically adjusts equipment output based on real-time voltage data to stabilize system voltage within the set range, effectively improving power quality.Equipped with a programmable logic controller (PLC) function, allowing users to define custom logic rules for coordinated control of multiple devices, such as switching circuits in conjunction with circuit breakers and disconnectors.In dual or multi-power supply systems, it supports backup power control: when the main power supply voltage is abnormal, it quickly sends control signals to switch to backup power, reducing power interruption time and ensuring reliability for important loads.
3. Real-time Monitoring and Fault Alarm
Collects key electrical parameters such as system voltage, current and frequency in real time, and displays operating data intuitively via the local LCD panel, enabling operation & maintenance personnel to quickly grasp equipment status.Supports multi-level alarm configuration; when parameters are abnormal, it notifies personnel promptly via sound & light alarm, contact output or communication messages.It automatically records fault information (fault time, type, values, etc.), providing accurate data for troubleshooting and accident analysis without manual on-site recording, improving O&M efficiency.
4. Intelligent Communication and Remote Management
Natively supports mainstream power communication protocols such as IEC 61850 and Modbus RTU.Equipped with dual communication interfaces (RS485 and RJ45), it can be seamlessly connected to smart distribution monitoring systems (SCADA) or distribution automation platforms, enabling remote upload of protection information, measurement data and remote setting adjustment.Supports remote access and local control, and can display customized system layouts, allowing O&M personnel to monitor status, troubleshoot and adjust parameters remotely without on-site duty, greatly reducing O&M costs.It is also compatible with GE RX3I and RX7I controllers, providing position, tachometer and diagnostic data for single-turn and multi-turn applications.
5. Flexible Configuration and Programmable Logic
Adopts modular hardware and software design.The order code accurately defines configurations including protection function combinations, I/O specifications, communication interface types and power supply types.Users can select functions in a “menu-style” manner according to project requirements to achieve customized solutions and avoid function redundancy.Provides graphical logic programming tools, allowing users to customize protection logic and interlock conditions to meet personalized requirements of different distribution network topologies and operating scenarios.Supports local parameter programming; thresholds, delays and other settings can be adjusted via panel keys or dedicated software, with convenient and flexible operation.
6. High Reliability and Convenient O&M
Uses ABB dedicated core chips and industrial-grade components, and has passed strict environmental adaptability tests (high/low temperature, vibration, EMC).It can operate stably for a long time under harsh conditions, with MTBF > 100,000 hours, reducing O&M costs.Wide operating temperature range (-25℃ ～ +70℃), front panel IP54 and unit IP20 allow installation in outdoor terminal boxes, indoor control cabinets and other environments.Built-in self-test circuit monitors the device status in real time; normal/alarm/fault status is indicated via onboard LEDs or LCD for fast fault location.Modular plug-and-play design enables quick installation, testing and replacement, greatly shortening downtime for maintenance.Remote diagnosis and maintenance are supported, further improving efficiency.
IV. Applications
1. Industrial Enterprise Distribution Networks
Used in captive power stations of large industrial enterprises such as iron and steel, chemical, cement, mining and machinery manufacturing, for voltage protection and control of production line motors, precision instruments and other equipment.When grid voltage fluctuates or internal circuit faults occur, it quickly cuts off the faulty circuit to avoid production interruption due to equipment damage.Cooperating with voltage regulators, it ensures stable voltage for equipment, improving product quality and production efficiency, while resisting strong electromagnetic interference and temperature fluctuations in workshops.
2. Commercial and Civil Building Power Distribution
Applied in power distribution systems of commercial complexes, office buildings, residential quarters and data centers.It provides voltage anomaly protection and backup power switching control for critical loads such as air conditioners, elevators, emergency lighting and servers.For example, when undervoltage occurs on the main power supply, it automatically activates backup generators to ensure emergency elevator stopping and normal emergency lighting, guaranteeing personnel safety and equipment stability.Suitable for compact switchgear installation to save cabinet space.
3. New Energy Power Stations
Provides voltage monitoring and protection at the grid connection point of distributed PV and wind power stations.When overvoltage, undervoltage or unbalance occurs, it promptly issues commands to disconnect the grid-connected circuit, preventing grid faults from damaging inverters and other core equipment.Through precise voltage regulation, it helps power stations meet grid connection standards and improve grid-connected stability, adapting to the special voltage management requirements of new energy integration.
4. Municipal and Public Utilities
Used in municipal facilities such as traffic signals, sewage treatment plants and water supply pumping stations.It provides reliable voltage protection and control for their distribution circuits, ensuring stable operation in complex grid environments and avoiding public service failures such as traffic paralysis and sewage treatment interruption caused by voltage problems.
V. Product Advantages
Voltage‑dedicated, comprehensive protection: Designed specifically for voltage management in medium and low-voltage distribution networks, integrating overvoltage, undervoltage, voltage unbalance and other full‑type voltage protection functions. Fast operation, high sensitivity, effectively preventing equipment damage from voltage anomalies. Focused on voltage protection and control, different from feeder protection, generator protection systems and pure I/O or measurement modules.
Precise control, improved power quality: Supports automatic voltage regulation, backup power switching, logic interlock and other functions. Seamlessly cooperates with voltage regulation equipment to stabilize system voltage, adapts to dual power supply scenarios, ensures continuous power supply for critical loads, and significantly improves distribution network power quality.
Intelligent communication, interconnection: Natively supports mainstream protocols such as IEC 61850 and Modbus RTU. Dual communication interfaces enable seamless access to distribution monitoring systems for remote monitoring, setting adjustment and fault alarm. Compatible with RX3I and RX7I controllers, enhancing system compatibility and scalability while reducing O&M costs.
Flexible configuration, strong customization: Modular hardware and software design; order code accurately configures functions, interfaces, power supply and other parameters. Supports custom logic programming and local parameter adjustment, adapting to different distribution network topologies and personalized needs for optimal cost‑effectiveness.
High reliability, strong environmental adaptability: Industrial‑grade components, high anti‑interference design, wide operating temperature range and high protection class. Passed strict environmental tests, MTBF > 100,000 hours, suitable for various harsh indoor and outdoor environments, reducing unplanned downtime.
Easy operation, efficient O&M: Graphical LCD screen and user‑friendly interface support local and remote commissioning and maintenance. Modular plug‑and‑play design enables quick installation and replacement. Built‑in fault recording and self‑test functions greatly shorten troubleshooting and maintenance downtime.
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