The ABB SPAD346C3 is a three-phase stabilized differential relay used for protecting electrical equipment such as power transformers, generators, motors, and lines. It is a part of the SPAD 346 C family of differential relays, which also includes the SPAD 346 C, SPAD 346 C1, and SPAD 346 C2 variants with different module configurations.

Here’s some key information about the SPAD346C3:

• Function: Provides differential protection, which compares the current entering and leaving an electrical element to detect internal faults (e.g., short circuits).
• Applications: Primarily used for two-winding power transformers and generator-transformer units. Can also be used for other applications like three-winding transformers, motors, generators, and lines.
• Features:
  • Stabilized differential protection to resist unwanted tripping due to external factors like magnetizing inrush currents.
  • Multiple setting options for adapting to different protection requirements.
  • Earth-fault protection (optional).
  • Overcurrent protection (optional).
  • Communication capabilities for integration with control systems.

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