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The ABB SPAU 330 C1-AA is a multi-functional voltage monitoring and protection relay designed for precise supervision of busbar phase-to-phase voltages and residual voltage ($U_0$) in medium- and high-voltage power systems. As part of...
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The ABB SPAU 330 C1-AA is a multi-functional voltage monitoring and protection relay designed for precise supervision of busbar phase-to-phase voltages and residual voltage ($U_0$) in medium- and high-voltage power systems. As part of ABB’s proven SPACOM relay family, it provides dependable protection against abnormal voltage conditions that can threaten the integrity of motors, transformers, capacitor banks, and distribution equipment.
This relay is engineered to detect overvoltage, undervoltage, and residual overvoltage conditions with high accuracy and repeatability. The microprocessor-based design ensures stable long-term performance, while optional integration of a digital disturbance recorder allows detailed post-fault analysis. Its robust construction and standardized panel mounting make it a trusted solution for substation and industrial power protection schemes.
| Specification | Detail |
|---|---|
| Full Designation | SPAU 330 C1-AA |
| Output Contacts | Heavy-duty SPDT signaling and trip contacts |
| Accuracy | Better than ±1.5% of set value |
| Reset Time | Typically < 50 ms |
| Operating Temperature | −10 °C to +55 °C |
| Mounting | Flush or semi-flush panel mounting |
| Communication | SPA bus protocol support |
| Optional Feature | Integrated disturbance recorder |
The SPAU 330 C1-AA is widely deployed in MV/HV substations and industrial power distribution systems, particularly for:
Busbar Voltage Supervision – Monitoring phase and residual voltages for abnormal conditions
Motor Protection – Preventing thermal stress and instability caused by prolonged undervoltage
Capacitor Bank Protection – Protecting insulation and dielectric elements from overvoltage stress
Earth Fault Detection – Residual voltage monitoring in isolated-neutral or compensated networks
Its reliability and diagnostic capability make it well-suited for critical infrastructure, including utilities, heavy industry, and process plants.
Can the SPAU 330 C1-AA record fault history?
Yes. When equipped with the optional disturbance recorder, the relay captures waveform data and event logs, enabling detailed post-fault analysis and troubleshooting.
Is this relay suitable for DC voltage monitoring?
No. The SPAU 330 C series is designed exclusively for AC voltage measurement and protection in power distribution systems.
What does the “AA” suffix indicate?
The AA suffix denotes the wide-range auxiliary power supply (110–240 V AC/DC) and the associated hardware configuration.
