Relays for Protection against 50 MVA 132/33 kV Transformer
Sl. No. Type of Relay Relay Name Appearance ANSI Code Purpose 1. Numerical Relay Trafo. Differential Protection Relay 87 For protection against phase-to-phase fault and phase to earth faults 2. Numerical Relay Over Current & Earth Fault Protn. Relay 51 For protection of transformers from over current and earth faults 3. Circulating Current E/F Diffn. …
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