ABB SPAJ140C

ABB SPAJ140C is a combined overcurrent and earth fault relay produced by ABB, widely used in industrial automation, building automation, and energy management fields. This relay connects to the current transformers of the protected equipment to detect and protect against three-phase overcurrent and earth faults. When the phase current exceeds the preset starting current, the overcurrent device activates and sends a signal after a preset time delay; similarly, the earth fault unit also activates and signals when a fault is detected.

Main Functions and Features

Overcurrent Protection: ABB SPAJ140C provides three-phase overcurrent protection, including a low set level I> and a high set level I>>, which activate at different current thresholds and send a trip signal after the preset time delay.

Earth Fault Protection: The relay also provides earth fault protection, including low set level I0> and high set level I0>>, which similarly activate and signal upon fault detection.

Built-in Circuit Breaker Failure Protection: ABB SPAJ140C features built-in breaker failure protection to ensure timely tripping in case of circuit breaker malfunction.

Signal Outputs: The relay has two heavy-duty relays and four signal output relays to provide alarm signals and record fault data.

Local Display and Settings: Users can view data on the local display and configure settings via front panel buttons or through serial and fiber optic bus interfaces connected to a higher-level system.

Communication Interfaces: ABB SPAJ140C supports multiple communication protocols such as Modbus RTU, IEC 60870-5-103, and IEC 61850 for easy integration with other systems.

High Reliability: The relay includes a self-supervision system that continuously monitors hardware and software status to ensure high reliability and long service life.

Application Areas

ABB SPAJ140C is widely used for short-circuit and earth fault protection in power systems, especially in radial feeders of solidly grounded, resistance grounded, or impedance grounded power systems for selective short-circuit and earth fault protection. It is also suitable for other applications requiring single-phase, two-phase, or three-phase overcurrent protection.

Summary

ABB SPAJ140C is a highly integrated and flexibly configurable combined overcurrent and earth fault relay with high reliability and stability. It is suitable for various industrial automation and power system protection scenarios. Its rich functionality and wide applicability make it an essential component in power system protection.

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