### Product Name

**ABB REF542PLUS Controller**
**Model Number:** 1VCR007346

### Product Description

The ABB REF542PLUS is a digital relay protection and control device designed for medium-voltage applications. It provides advanced protection, monitoring, and control functions for power transformers, feeders, and motors. The REF542PLUS is equipped with an intuitive user interface, extensive communication capabilities, and configurability for various applications, making it suitable for both utility and industrial environments.

### Product Parameters and Specifications

**General Specifications**
– **Type:** Digital relay protection and control device
– **Voltage Rating:** Typically for medium-voltage systems
– **Dimensions:** Compact design for easy integration
– **Weight:** Varies with configuration
**Protection Functions**
– Overcurrent protection (Phase & Earth)
– Differential protection for transformers
– Voltage protection (over-voltage, under-voltage)
– Frequency protection (over & under-frequency)
– Directional elements for complex applications
**Control Functions**
– Automatic reclose functions
– Logic programming capabilities
– Manual and automated operation
– Support for circuit breaker control
**Communication Interfaces**
– Ethernet (IEC 61850, Modbus TCP/IP)
– Serial communication (RS-232, RS-485)
– Digital communication protocols
**Monitoring and Logging**
– Event logging
– Real-time data monitoring
– Disturbance recording (oscillographs)
– System health monitoring
**Power Supply**
– Wide input voltage range
– Backup battery support for continuous operation
**Environmental Specifications**
– Operating Temperature: Typically -25°C to +55°C
– Humidity: 5% to 95% non-condensing
**User Interface**
– LCD display for configuration and monitoring
– Keypad for local control
– Remote operation capabilities

### Product Use

The ABB REF542PLUS controller is primarily used in the protection and control of:

– **Power Transformers:** Ensures operational reliability, protection against faults, and extends equipment life.
– **Medium-Voltage Feeders:** Monitors and protects distribution lines to maintain system stability.
– **Industrial Applications:** Used in factories or plants for motors and equipment requiring protection.
– **Smart Grid Applications:** Essential for enhancing the automation and efficiency of electrical grids.

This device is widely utilized in power utilities, industrial plants, and commercial facilities, contributing to improved safety, reliability, and efficiency in electrical systems.