ABB REU615E_D Voltage Protection and Control Relay



ABB REU615E-D Voltage Protection and Control Relay

Core function: Comprehensive voltage protection and control

REU615E-D has built a multidimensional protection and control system with voltage parameters as the core monitoring object, covering the full process functions of fault warning, fault removal, and operation regulation, as follows:

1. Basic voltage protection function

-Overvoltage protection: When the system voltage is detected to be higher than the preset threshold, the relay quickly triggers an alarm or trip command to avoid damage to equipment such as transformers and motors due to insulation breakdown, iron core saturation, and other issues. Support setting multi-level thresholds based on system characteristics to adapt to the voltage tolerance requirements of different devices.

-Undervoltage protection: In cases where the voltage is below the safe range, timely action is taken to prevent motor stalling, insufficient equipment output, and other issues. At the same time, it can be combined with an automatic backup power supply switching device (ATS) to achieve rapid switching of the power supply circuit and ensure continuous operation of critical loads.

-Voltage imbalance protection: monitors the balance of three-phase voltage. When the deviation of three-phase voltage exceeds the set value (such as phase loss or sudden rise and fall of a certain phase voltage), an alarm signal is immediately issued and corresponding protection measures are taken. It is suitable for load protection sensitive to three-phase balance in low-voltage distribution systems.

-Overfrequency/Underfrequency Protection: Voltage is closely related to frequency, and this function indirectly reflects voltage stability by monitoring system frequency changes. When the frequency exceeds the normal range, the protection is triggered. It is suitable for isolated power grids or new energy grid connected scenarios to prevent voltage interlock faults caused by frequency collapse.

2. Precise control function

-Voltage regulation control: supports linkage with on load voltage regulating transformers, SVG and other voltage regulating equipment, automatically adjusts equipment output based on real-time voltage monitoring data, stabilizes system voltage within the set range, and improves power supply quality.

-Logic control function: equipped with programmable logic unit (PLC) function, users can customize logic rules according to actual operating needs, achieve multi device collaborative control, such as linking with circuit breakers and isolation switches to complete circuit switching operations.

-Backup power supply control: In dual or multiple power supply systems, when the main power supply voltage is abnormal, the relay can quickly send a control signal to switch to the backup power supply, shorten the power interruption time, and ensure the reliability of important load power supply.

3. Monitoring and alarm functions

Real time collection of key parameters such as system voltage, current, frequency, etc., and intuitive display of operational data through local panels or remote monitoring systems; Support multi-level alarm settings. When parameters are abnormal, various methods such as sound and light alarms, contact outputs, and communication messages are used to promptly notify operation and maintenance personnel. At the same time, fault information (such as fault occurrence time, fault type, parameter values, etc.) is recorded to provide a basis for fault troubleshooting.

Key technical parameters: adaptable to various power scenarios

rated voltage

Phase voltage: 220V/110V (AC); Line voltage: 380V/220V (AC), supports a wide voltage input range

Voltage measurement range

0-1.2 times rated voltage, measurement accuracy ± 0.5%

rated frequency

50Hz/60Hz， Can be automatically recognized or manually set

Protection action time

The minimum action time is ≤ 50ms, and the delay time (0-30s) can be flexibly set according to the needs

Contact capacity

Output contacts: AC 250V/5A, DC 24V/10A, supports multiple sets of normally open/normally closed contact configurations

communication interface

Standard RS485 interface, supporting communication protocols such as Modbus RTU and IEC 61850, enabling remote monitoring and data uploading

working environment

Temperature: -25 ℃~+70 ℃; Humidity: 5%~95% (no condensation); Altitude ≤ 2000m (special customization required for exceeding)

Protection level

Panel protection IP54, overall device IP20 (suitable for cabinet installation)

Typical application scenarios: covering power demand in multiple fields

With its flexible functional configuration and stable performance, REU615E-D is widely used in various power systems, with core scenarios including:

1. Industrial enterprise power distribution system

Provide voltage protection for production line motors, precision instruments, and other equipment in industrial scenarios such as manufacturing, chemical, and metallurgical industries. When there is voltage fluctuation or internal circuit failure in the power grid, quickly cut off the faulty circuit to avoid equipment damage and production interruption; At the same time, cooperate with the voltage regulating device to ensure that the equipment operates at a stable voltage, improve product quality and production efficiency.

2. Commercial and civil building power distribution

Suitable for power distribution systems in office buildings, shopping malls, residential communities, and other buildings, it achieves voltage anomaly protection and backup power switching control for critical loads such as air conditioning, elevators, and emergency lighting. For example, when the main power supply is under voltage, the backup generator is automatically triggered to ensure the emergency stopping of the elevator and the normal operation of emergency lighting, ensuring the safety of personnel.

3. New energy power plants

Used for voltage monitoring and protection at grid connection points in photovoltaic and wind power plants. When there are problems such as overvoltage, undervoltage, or imbalance in the power grid voltage, timely instructions should be issued to cut off the grid connected circuit to prevent the impact of power grid faults on core equipment such as inverters; At the same time, through precise voltage regulation, it helps power stations meet grid connection standards and improve grid stability.

4. Municipal and public facilities

Applied to municipal facilities such as traffic lights, sewage treatment plants, and water pressure stations, providing reliable protection for their power distribution circuits. Ensure the stable operation of municipal facilities in complex power grid environments, avoiding public service failures such as traffic paralysis and sewage treatment interruptions caused by voltage issues.

Product advantage: Helps with efficient operation and maintenance of power systems

1. High reliability and stability

Using ABB dedicated core chips and industrial grade components, after rigorous environmental adaptability testing (such as high and low temperature, vibration, electromagnetic compatibility testing), it can operate stably for a long time under harsh working conditions, with an average time between failures (MTBF) of over 100000 hours, reducing operation and maintenance costs.

2. Functional modularization and flexibility

The protection and control functions adopt modular design, and users can choose to configure corresponding functional modules according to their actual needs to avoid functional redundancy; Support parameter localization programming settings, which can be adjusted for threshold, delay, and other parameters through panel buttons or dedicated software, adapting to personalized needs in different scenarios.

3. Convenient monitoring and operation

Equipped with a clear LCD display panel, it displays real-time information such as voltage, current, and operating status, allowing operation and maintenance personnel to intuitively grasp the operation of the equipment; Support remote communication function, can be connected to power monitoring system (SCADA), realize centralized monitoring of multiple devices, remote parameter setting, and automatic uploading of fault information, and improve operation and maintenance efficiency.

4. Good compatibility and scalability

Supports multiple international communication protocols and can seamlessly integrate with PLCs and monitoring equipment from different brands; Reserve expansion interfaces to add functional modules (such as harmonic monitoring, power factor compensation control, etc.) according to system upgrade requirements, extending the product lifecycle.

Installation and usage precautions

-Before installation, it is necessary to confirm that the rated parameters of the relay match the system voltage, frequency, etc., to avoid equipment damage caused by mismatches.

-The installation location should be chosen in an area with good ventilation, away from strong magnetic fields, and free of corrosive gases to ensure that the environmental temperature and humidity meet the product requirements.

-When wiring, it is necessary to strictly distinguish between power circuits, measurement circuits, and output control circuits to avoid short circuits or wiring errors; After the wiring is completed, the tightness of the wiring should be checked to prevent poor contact from causing faults.

-Before the first operation, it is necessary to configure the protection threshold, delay time, communication parameters, etc. through dedicated software or panel to ensure that the parameters meet the system operation requirements.

-In daily operation and maintenance, the panel should be cleaned regularly, the wiring status and equipment operating parameters should be checked, and protection function tests should be conducted regularly to ensure that the relay is in normal working condition.