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The artificially triggered lightning test was used and a 4-element AWS was simulated near the lightning channel to analyze and study the induced effects caused by the lightning and the key lightning protection techniques for AWS. This paper analyzes the induced overvoltage characteristics and SPD residue voltage characteristics caused by triggered lightning with multiple return strokes on the transmission line of an AWS, as well as the relationship with the triggered lightning. The results show that: (a) The return strokes of the near triggered lightning generate bipolar induced overvoltages on the overhead line, with peaks up to more than 10 kV. The overvoltages can be divided into the main peak phase and the subsequent overvoltage phase, which last about 100 μs and 4 ms respectively on average. The period of the subsequent overvoltages is related to the fluctuation of the current of the triggered lightning; (b) Overvoltages of 2 kV or above can be induced at the initial continuous current phase. They last a long period of time and concentrate about 12 ms, with the mean voltage being 332.5 V. Its potential damage to the transmission line cannot be neglected.
Date of Conference: 12-16 April 2010