ABB SPAU140C Relay protector

Here is an overview of the ABB SPAU140C Relay Protector:

Brand Overview

• Brand: ABB (Asea Brown Boveri)

• About the Brand: ABB is a global leader in power and automation technologies. Their protection and control relays are widely recognized in the electrical utility and heavy industry sectors for preventing equipment damage, ensuring grid stability, and maintaining operational safety.

ABB SPAU140C Relay protector

Product Identification

• Model/Part Number: SPAU140C (often stylized as SPAU 140 C)

• Product Type: Numerical Synchro-Check and Voltage-Check Relay

• Product Family: SPACOM series

Technical Specifications

• Primary Functions: Dual-purpose capability providing both Synchro-check (verifying synchronization parameters before joining two live power systems) and Voltage-check (monitoring conditions when connecting a dead bus/line to an energized network).

• Operation Stages: Features two identical independent operation stages, meaning a single relay can manage and check the closing conditions of two separate circuit breakers.

• Voltage Inputs: Rated inputs for 100 V and 110 V networks (via Voltage Transformers). Continuous voltage withstand rating is 2.0 x Un.

• Frequency Range: Supports 50 Hz or 60 Hz networks with a permissible range of 45 to 65 Hz.

• Setting Parameters & Resolution:

  • Voltage Difference (ΔU): Setting range of 0.02 to 0.4 x Un.

  • Phase Angle Difference (Δφ): Setting range of 5° to 50° with a 1° resolution.

  • Frequency Difference (Δf): Setting range of 0.02 to 0.25 Hz.

• Operation Modes: Supports both “Continuous Mode” (providing continuous permissive closing signals to separate control systems) and “Command Mode” (directly pulsing and controlling the circuit breaker’s close mechanism).

• Auxiliary Power Supply: Configurable with either a high-voltage module (80 to 265 V AC/DC) or a low-voltage module (18 to 80 V DC).

• Self-Supervision: Built-in continuous auto-diagnostic system that monitors both relay hardware and software integrity.

Target Industries

The SPAU140C is implemented in systems where accidental out-of-phase connection of electrical grids or large rotatory equipment could cause catastrophic mechanical or electrical failure:

• Power Utilities & Generation: Thermal, hydro, gas, and nuclear power plants, as well as electrical substations.

• Oil & Gas / Petrochemicals: Refineries, gas processing plants, and LNG terminals with large internal power infrastructures.

• Heavy Manufacturing: Large-scale metallurgy, chemical processing, and automotive assembly facilities managing high-voltage distribution networks.

• Marine & Offshore Engineering: Offshore oil platforms and marine transport ships relying on multi-generator island grids.

Applications and Use Cases

• Generator Paralleling: Safely synchronizes a spinning standalone generator with the main utility grid, preventing damage to the generator shaft or windings due to out-of-phase forces.

• Bus Transfer Systems: Manages automatic or manual bus transfers in medium-voltage switchgear to safely shift power sources without dropping critical industrial loads.

• Substation Grid Restoration: Ensures safe reconnection of separate sections of an electrical distribution system or ring mains after network fault isolation or maintenance routines.

• Dead-Bus/Dead-Line Interlocking: Permits a circuit breaker to close onto a “cold” network section only when the energizing direction matches safety protocols, eliminating dangerous cross-connections.