ABB SPAU110C Residual Overvoltage Relay

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• • • • 1. Product Overview

        The ABB SPAU110C Residual Overvoltage Relay is designed to supervise the residual (zero-sequence) voltage U0 of power systems. When an earth fault or insulation failure causes the residual voltage to rise above the preset threshold, the relay issues an alarm or trips the circuit breaker, ensuring safe and reliable system operation. It is suitable for various earthing methods and offers high reliability through continuous self-supervision.

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        2. Main Technical Specifications

        Item	Specification
        Model	ABB SPAU110C
        Protection Type	Residual overvoltage protection (Zero-sequence voltage U0)
        Protection Stages	Two stages: Low-set (U0>), High-set (U0>>)
        Auxiliary Supply	80–265 V AC/DC or 18–80 V DC (depending on module type)
        Input Signal	VT zero-sequence voltage input
        Outputs	Relay contact outputs for trip / alarm
        Control Inputs	Optically-isolated logic input for blocking
        Self-Supervision	Continuous monitoring of hardware, software, and internal supply
        Communication	Serial communication interface for SCADA integration
        Applicable Systems	Isolated-neutral, resistance-earthed, reactance-earthed, and resonant-earthed systems
        Installation	Modular withdrawable structure

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        3. Key Features / Advantages

        • Dual-stage protection for flexible alarm and trip settings

        • Highly reliable self-monitoring system

        • Compatible with multiple earthing methods

        • Modular design for easy installation and maintenance

        • Flexible I/O configurations for protection coordination

        • Supports communication with supervisory control systems

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        4. Typical Applications

        • Earth-fault detection in medium/low-voltage distribution networks

        • Industrial plants for motor, cable, and busbar protection

        • Power plants and substations for zero-sequence voltage protection

        • Capacitor banks and reactors for imbalance monitoring

        • Any system requiring residual-voltage supervision and fast protection

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        5. Installation & Operation Precautions

        1. Ensure correct VT zero-sequence wiring and polarity.

        2. Set proper thresholds and time delays based on the earthing method.

        3. Perform functional tests before commissioning.

        4. Regularly inspect auxiliary supply and wiring integrity.

        5. For resonant-earthed systems, ensure proper coordination if used for neutral-resistor switching.

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The structure and details of the product：

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