Description

ABB SPAU140C‑Numerical Synchro‑Check Relay

1. Product Title

ABB SPAU140C‑ Numerical Synchro‑Check Protection Relay

2. Product Overview

The SPAU140C is a numerical synchro‑check relay applied in medium‑voltage and high‑voltage switchgear, supervising voltage, phase angle and frequency difference before circuit‑breaker closing operations. SPAU140C prevents hazardous paralleling by blocking breaker closure when synchronism conditions are out of user‑configured thresholds. It integrates measurement logic, configurable setting parameters and serial communication interfaces for remote monitoring. Front‑panel LCD display and LED status indicators support local parameter checking and fault diagnosis. This device improves grid safety for generator synchronisation and bus‑section switching within electrical substations.

3. Technical Specifications

• Brand: ABB
• Model: SPAU140C
• Warranty: One Year
• Condition: 100% New & Original
• Input/Output: Dual voltage measuring inputs; configurable digital inputs / relay output contacts
• Setting Ranges: Voltage difference ΔU:0.02‑0.4×Un; phase‑angle difference Δφ:5‑50°; frequency difference Δf:0.02‑0.25 Hz
• Communication: RS‑485 Modbus RTU, SPA bus, DNP3 protocol support
• Auxiliary Supply: 80‑265 V AC/DC or 18‑80 V DC
• Operating Temp: ‑20 °C ~ +60 °C
• Dimensions/Weight: 145 × 145 × 100 mm; approx. 3.15 kgABB Group
• Mounting: Panel‑mount for switchgear bay
• Compliance: IEC 60255 protection relay standards, CE certified
• 

4. Application Scenarios

• Power Substation Generator Paralleling: The SPAU140C validates synchronism conditions before generator‑to‑grid breaker closure, avoiding out‑of‑phase switching faults.
• HV/MV Switchgear Bus‑Coupler Protection: Monitors phase matching for bus‑section breakers, ensuring safe interconnection of different power supply segments in utility substations.