**Product Name:**

ABB REF542PLUS

**Product Description:**

The ABB REF542PLUS is a digital protection relay designed for medium-voltage substations. It is part of ABB’s REF family of relays, which are known for their robustness and advanced functionality. The REF542PLUS provides comprehensive protection, control, and monitoring capabilities for various types of electrical equipment, including transformers, feeders, and generators.

**Product Parameters and Specifications:**

**Protection Functions:**

– Overcurrent protection (Phase and Earth)
– Directional overcurrent protection
– Differential protection for transformers and feeders
– Transformer temperature monitoring
– Under-voltage and over-voltage protection
– Over-frequency and under-frequency protection

**Control Functions:**

– Circuit breaker control (open/close)
– Reclosing functions
– Manual and automatic control modes
– Remote control and monitoring capabilities

**Measurement and Monitoring:**

– Voltage, current, and power measurement
– Harmonic analysis
– Event logging and fault recording
– Metering of energy consumption

**Communication:**

– Multiple communication protocols (e.g., IEC 61850, DNP3, Modbus)
– Ethernet connectivity for remote access and diagnostics
– Support for various I/O options (digital and analog)

**User Interface:**

– LCD display with backlight
– User-friendly graphical interface
– Front-panel navigation buttons
– Local and remote configuration options

**Power Supply:**

– Wide range of operating voltages (e.g., 24V DC, 48V DC, 110V DC, 220V AC/DC)

**Environmental and Physical:**

– Compact and rugged design suitable for harsh environments
– Operating temperature range: -25°C to +70°C
– Protection class: IP54 (front panel)

**Product Use:**

The REF542PLUS is used in a variety of medium-voltage applications, including:

– Protection of electrical feeders and transformers in substations
– Monitoring and controlling medium-voltage networks
– Enhancing the reliability and safety of electrical distribution systems
– Providing advanced diagnostics and fault analysis to minimize downtime

Its flexibility, comprehensive functionality, and robust design make it suitable for both new installations and retrofitting into existing systems.

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