George Podporkin Ru Session 2 – Block 1 – Paper 19 Barcelona 12-15 May 2003 1 LIGHTNING PROTECTION OF MEDIUM VOLTAGE OVERHEAD LINES WITH COVERED CONDUCTORS.

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Presentation transcript:

George Podporkin Ru Session 2 – Block 1 – Paper 19 Barcelona May LIGHTNING PROTECTION OF MEDIUM VOLTAGE OVERHEAD LINES WITH COVERED CONDUCTORS BY ANTENNA- WITH COVERED CONDUCTORS BY ANTENNA-TYPE LONG FLASHOVER ARRESTERS A ALFA

George Podporkin Ru Session 2 – Block 1 – Paper 19 Barcelona May 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.

George Podporkin Ru Session 2 – Block 1 – Paper 19 Barcelona May ALFA operating principle 12 – electrode; 13 – antenna

George Podporkin Ru Session 2 – Block 1 – Paper 19 Barcelona May Protection of MV line by ALFA 14 - insulator; 15 – steel pipe

George Podporkin Ru Session 2 – Block 1 – Paper 19 Barcelona May Line mock -up testing

George Podporkin Ru Session 2 – Block 1 – Paper 19 Barcelona May Equivalent circuit diagram Ul - lightning potential Uа - antenna potential Clа - lightning-antenna Cаg - antenna-ground R - leakage resistance

George Podporkin Ru Session 2 – Block 1 – Paper 19 Barcelona May Antenna potential vs. time to breakdown

George Podporkin Ru Session 2 – Block 1 – Paper 19 Barcelona May Simplified test outline simulation of lightning leader approaching a line U

George Podporkin Ru Session 2 – Block 1 – Paper 19 Barcelona May Simplified test outline simulation of lightning final stroke U

George Podporkin Ru Session 2 – Block 1 – Paper 19 Barcelona May –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. CONCLUSIONS

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