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LIGHTNING PROTECTION OF MEDIUM VOLTAGE OVERHEAD LINES

LIGHTNING PROTECTION OF MEDIUM VOLTAGE OVERHEAD LINES. WITH COVERED CONDUCTORS BY ANTENNA- WITH COVERED CONDUCTORS BY ANTENNA-TYPE LONG FLASHOVER ARRESTERS A ALFA. Lightning protection diagram. 1 – thunderstorm cloud; 2 – lightning channel; 3 – space charge;

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LIGHTNING PROTECTION OF MEDIUM VOLTAGE OVERHEAD LINES

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  1. LIGHTNING PROTECTION OF MEDIUM VOLTAGE OVERHEAD LINES • WITH COVERED CONDUCTORS BY ANTENNA-WITH COVERED CONDUCTORS BY ANTENNA-TYPE LONG FLASHOVER ARRESTERS A ALFA

  2. Lightning protection diagram 1 – thunderstorm cloud; 2 – lightning channel; 3 – space charge; 4 – pole; 5 – insulator; 6 – insulator flashover channel; 7 – binding; 8 – insulating cover; 9 – conductor’s core; 10 – surface flashover channel; 11 – piercing clamp.

  3. ALFA operating principle 12 – electrode; 13 – antenna

  4. Protection of MV line by ALFA 14 - insulator; 15 – steel pipe

  5. Line mock -up testing

  6. Equivalent circuit diagram Ul - lightning potential Uа - antenna potential Clа- lightning-antenna Cаg - antenna-ground R- leakage resistance

  7. Antenna potential vs. time to breakdown

  8. Simplified test outline U simulation of lightning leader approaching aline

  9. Simplified test outline U simulation of lightning final stroke

  10. CONCLUSIONS • ALFA flashovers well before a direct contact of the channel with a conductor. • ALFA protects the line against both induced overvoltages and direct lightning strokes. • A simple design makes ALFA less expensive than conventional metal oxide arresters.

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