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The ABB SPAU 140 C is a high-precision numerical synchro-check relay designed to supervise the safe interconnection of two independent AC power systems. Using a microprocessor-based measurement and logic platform, the relay...
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The ABB SPAU 140 C is a high-precision numerical synchro-check relay designed to supervise the safe interconnection of two independent AC power systems. Using a microprocessor-based measurement and logic platform, the relay ensures that voltage magnitude, frequency, and phase angle are all within permissible limits before permitting a breaker close command. This prevents out-of-phase switching events that can cause severe mechanical stress, torque shock, and electrical transients in generators, transformers, and switchgear.
In addition to standard synchro-check functionality, the SPAU 140 C incorporates flexible internal logic to support dead-bus and live-line operating modes, making it well suited for automated restoration, black-start sequences, and generator synchronization applications. Its compact panel-mounted form factor, combined with a clear LCD interface and keypad-based parameter setting, allows straightforward integration into modern generator control panels and substation switchgear.
| Specification | Detail |
|---|---|
| Model Designation | SPAU 140 C |
| Relay Type | Numerical Synchro-check and Voltage Supervision |
| Rated Secondary Voltage ($U_n$) | 100 V / 110 V / 115 V AC (configurable) |
| Frequency Range | 47 Hz to 63 Hz |
| Measurement Accuracy | ±0.5% of set value |
| Operating Time | < 20 ms |
| Reset Time | < 2 s |
| Power Consumption | < 5 VA |
| Operating Temperature | −20 °C to +60 °C |
| Dimensions (W × H × D) | 114 × 176 × 85 mm |
| Net Weight | 1.2 kg |
Generator Synchronization
Ensures safe paralleling of standby or base-load generators with the utility grid or plant busbars.
Automatic Bus Transfer (ABT)
Supervises voltage and phase conditions during load transfer between independent power sources.
Network Restoration & Black-Start
Supports dead-bus and live-line closing logic for controlled re-energization after outages.
Tie-Breaker Supervision
Monitors phase relationships across bus-tie breakers in ring-main and multi-bus systems.
What conditions does the SPAU 140 C check before allowing breaker closure?
The relay continuously evaluates:
Voltage difference ($\Delta U$)
Frequency difference ($\Delta f$)
Phase angle difference ($\Delta \phi$)
Closure is permitted only when all parameters fall within the configured synchronization window.
Can the SPAU 140 C be used for dead-bus closing?
Yes. The relay includes programmable logic for Live Bus / Dead Line and Dead Bus / Live Line modes, which are essential for black-start operations and automated service restoration.
