ABB RET620-5BTNAAAANHC8BNA11G Transformer Protection and Control

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1. Product Overview

The ABB RET620-5BTNAAAANHC8BNA11G is a high-performance transformer protection and control relay designed for comprehensive protection, monitoring, and automatic control of power transformers. The relay integrates differential, overcurrent, grounding fault, overload, over/under voltage, and temperature protection. It also supports remote monitoring and data acquisition via communication interfaces. The RET620 series features a modular, high-reliability design suitable for substations, industrial plants, and distribution systems.

2. Main Technical Specifications

• Manufacturer: ABB

• Model: RET620-5BTNAAAANHC8BNA11G

• Product Type: Transformer Protection and Control Relay

• Protection Functions: Differential, overcurrent, ground fault, overload, over/under voltage, temperature protection

• Monitoring Functions: Transformer status, current, voltage, power, power factor, temperature

• I/O Interfaces: Digital and analog inputs/outputs

• Communication Interfaces: Modbus, IEC 61850, Profibus, DNP3 (optional)

• Power Supply: 110–240 V AC/DC

• Ambient Temperature Range: -20 °C to +70 °C

• Protection Class: IP54 (front panel)

• Mounting: Panel mounting

• Response Time: Millisecond-level

• Standards Compliance: IEC 60255, IEC 61850, IEC 60076

3. Advantages and Features

1. Comprehensive Protection Functions
   Integrated differential, overcurrent, ground fault, overload, over/under voltage, and temperature protection ensures transformer safety.

2. High-Precision Monitoring
   Real-time monitoring of current, voltage, power, power factor, and transformer temperature for accurate protection and fault diagnostics.

3. Remote Communication and Data Acquisition
   Supports IEC 61850, Modbus, Profibus, etc., enabling remote control and data logging.

4. Modular and Expandable Design
   Supports multi-function module expansion, facilitating system upgrades and maintenance.

5. High Reliability and Industrial-Grade Design
   Dust- and moisture-resistant, suitable for harsh environments, ensuring long-term stable operation.

4. Typical Applications

• Substation transformer protection

• Industrial plant transformer monitoring and protection

• Distribution system and critical power equipment protection

• Energy management and smart grid applications

• Medium/high-voltage power system control and monitoring

5. Installation and Operation Notes

1. Verify the relay’s supply voltage, interfaces, and protection functions match the transformer and system requirements.

2. Follow wiring diagrams carefully to ensure correct connection of digital, analog, and communication interfaces.

3. Install in a ventilated, dry environment; avoid high temperature, dust, and corrosive gases.

4. Perform functional tests before commissioning, including differential, overcurrent, ground fault protection, and communication testing.

5. Regularly inspect relay and wiring connections to ensure long-term stable operation.

The structure and details of the product：

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