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    Sepam 3 - Winding Differential Protection

    Protection Relays for Protection of Networks and HV/MV Substations

    End of commercialisation

    High-performance protection relays for the protection of distribution systems and HV/MV substations

    Sepam 3 - Winding Differential Protection
    • Features

      Range of digital protection relays, ready-to-use, providing all the functions required by an application:

      • complete protection against internal transformer faults
      • restricted earth fault protection included
      • simple implementation due to the use of neural networks
      • metering
      • alarms and indication
      • control monitoring and diagnosis
      • communication

      Two applications:
      D32:three-winding differential protection for public and industrial distribution network.
      D31: three-winding differential protection for HV/MV substations.


      Simplicity and performance, headed in the right direction Protect your power system with full peace of mind using Sepam protection relays.

      • 20 years of experience in digital relays
      • A consistent range of relays organised according to applications


      Protection of a three-ended zone which includes a transformer, an auto-transformer or a generator-transformer unit.
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