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The document discusses the history and evolution of transformer differential relay technology from the 1960s to the 1990s. Early relays used kickfuses or induction patterns to provide time delay during magnetizing inrush currents. Later relays used harmonic filtering and restraint to distinguish between inrush and fault currents. Further developments included waveform recognition, fifth harmonic restraint for overexcitation, and high-set elements for fast operation during CT saturation. However, some relays

Author

Vinodkumar Koodi

Language

EN