ABB REF542PLUS

The ABB REF542PLUS is a versatile and advanced feeder terminal unit designed for comprehensive protection, control, measurement, and monitoring in medium-voltage (MV) switchgear applications. It integrates multiple functions into a single device, making it suitable for protecting feeders, transformers, and motors. Below is a summary of its key technical parameters and features based on the search results:

Key Technical Parameters:

1. Power Supply:

Input Voltage Range: 100–220 V AC (free power type design) 

Allowable Voltage Variation: ±10% of the input power supply 

Input Current: Maximum 5 A 

2. Driving Current:

Driving Current Range: 1.0–2.8 A/phase (bipolar constant current five-phase driving method) 

3. Protection Functions:

Includes a wide range of configurable protection features such as:

Overcurrent protection (instantaneous, timed, inverse time, directional) 

Ground fault protection (directional and non-directional) 

Voltage protection (overvoltage, undervoltage) 

Differential protection (for transformers and motors) 

Distance protection 

Thermal protection for cables, transformers, and motors 

Automatic reclosing and synchronization check 

4. Measurement Capabilities:

Measures three-phase currents, zero-sequence current, three-phase/line voltages, zero-sequence voltage

Monitors active/reactive power, power factor, frequency, and energy (active/reactive electricity) 

Calculates maximum and average currents over a configurable period (0–30 minutes), sum of interrupted currents, operating time, number of switching cycles, spring charging time, and trip coil monitoring 

5. Control and Automation:

Programmable using functional block programming language (FUPLA) for defining control schemes, interlocking, automation sequences, and logic functions (e.g., timers, counters, triggers) 

Supports local and remote control modes with interlocking to prevent switching errors 

6. Communication Interfaces:

Supports multiple communication protocols, including:

IEC 61850 

Modbus RTU (RS485 or fiber optic interface) 

IEC 60870-5-103 

LON (fiber optic interface) 

SPABUS (fiber optic interface) 

Ethernet interface for embedded web server 

Front RS232 port for configuration 

Optional optical input port for time synchronization 

7. Human-Machine Interface (HMI):

Detachable graphical HMI with large multilingual LCD display (supports Chinese) 

Displays single-line diagrams, text messages, and menu-driven interfaces 

LED indicators for status and alarms 

8. Hardware Specifications:

Binary I/O Modules: Up to 3 I/O cards, each with 14 inputs and 9 outputs 

Analog Input Modules: For connecting current and voltage signals from analog transformers or non-inductive sensors; optional 4–20 mA analog input module 

Analog Output Module: Optional 0(4)–20 mA output 

9. Self-Diagnostics and Alarms:

Self-monitoring for hardware and software faults 

Alarm functions for over-temperature, over-current, and broken wire detection in analog channels 

Watchdog contacts for binary I/O modules to detect failures 

10.Mechanical and Environmental:

Designed for flexibility with separable HMI and basic unit for easy installation in switchgear 

Compatible with gas-insulated (ZX-type) and air-insulated (ZS1-type) switchgear 

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First hand source//affordable price//Spot inventory!

•Shipping Port: Xiamen

•E-mail: sales7@saulplc.com

•Tel/WhatsApp/Wechat: + 86-15359273796

•Ship to you via Fedex/DHL/TNT/UPS/EMS

•Package: Original packing with cartons