Description
The ABB SACE750090R0002 (part of the REF542plus family) is a multi-functional protection, control, measurement, and monitoring unit for medium-voltage switchgear. This REF542plus Unit combines the flexibility of a programmable logic controller (PLC) with high-speed digital signal processing to provide comprehensive protection for feeders, transformers, and motors.
Product Introduction
The REF542plus series is renowned for its modular architecture and integrated HMI (Human Machine Interface). The SACE750090R0002 version is typically equipped with a specific set of hardware modules, including analog inputs for current and voltage sensing, binary I/O for status monitoring, and communication interfaces. It is designed to act as the primary interface between the primary power system and the station-level automation system.
ABB SACE750090R0002 REF542plus
Product Parameters (Datasheet)
| Parameter | Specification |
| Model Number | SACE750090R0002 (REF542plus) |
| Supply Voltage | 48V – 265V AC/DC (Universal Power Supply) |
| Analog Inputs | Up to 8 Current/Voltage sensors (Configurable) |
| Binary Inputs | 14 to 42 inputs (depending on card configuration) |
| Binary Outputs | 8 to 24 outputs (Power/Signal relays) |
| Measurement Accuracy | Class 0.5 for current and voltage |
| Communication | MODBUS RTU, Profibus DP, or IEC 61850 |
| Protection Speed | Minimum trip time < 30ms |
| Display | High-resolution LCD with mimic diagram support |
| Operating Temp | -5°C to +55°C |
Country of Origin
- Origin: Switzerland / Italy (ABB Power Grids)
Usage Instructions
- Panel Mounting: Install the unit into the front panel of the switchgear cubicle. Ensure the grounding strap is connected to the cubicle earth bar.
- Analog Connections: Connect the secondary circuits of the Current Transformers (CT) and Voltage Transformers (VT) to the analog input block. Verify polarity to ensure correct power measurement.
- Programming: Use the SCUconf (REF542plus configuration tool) to define protection functions (e.g., 50/51, 27, 59) and logic blocks.
- HMI Customization: Configure the mimic diagram on the LCD to represent the physical state of the circuit breaker and disconnectors.
- Testing: Perform a secondary injection test to confirm the pickup values and trip curves match the coordination study.
Product Q&A
- Q: Can the REF542plus be used for differential protection?
- A: Yes, depending on the software version and hardware configuration, it can support restricted earth fault and simple differential protection schemes.
- Q: What is the significance of the “plus” in the name?
- A: The “plus” signifies the second generation of the REF542, which introduced enhanced memory, faster processing, and support for the IEC 61850 communication protocol.
- Q: How do I recover from a “Watchdog Error” on the display?
- A: A watchdog error usually indicates a hardware failure or internal software hang. Perform a hard power cycle; if the error persists, the CPU module may require replacement.
Recommended Similar Models
- ABB REF615: Dedicated feeder protection and control relay (615 series).
- ABB REF541: Earlier version of the multifunctional feeder terminal.
- ABB REM543: Specialized motor protection and control unit.
- ABB RET541: Specialized transformer protection terminal.
- ABB REX521: Compact protection and control relay for basic feeder applications.
Documentation & Manuals
For detailed logic programming guides and terminal mapping for the SACE750090R0002 variant:
Download ABB REF542plus MANUAL datasheet
