The synchronism characteristics of impulse voltage generator are analyzed and three measures are put forward to improve the synchronism characteristics of impulse voltage generator in the paper. For a 24-stage impulse voltage generator, the synchronism range improves by 40% under the 3500kV lightning impulse voltage while it improves by 25% under the 1300kV (250/2500us) operating impulse voltage.
Key words: Impulse voltage generator, synchronism characteristic, improvement
Transient overvoltages (impulse) fall into three categories: slow-wave front (operation) overvoltage, fast-wave front (lightning) overvoltage and steep wave front overvoltage according to wave front time in the regulation GB311.1. The synchronism characteristics of sphere gap discharging are a key factor, which affects the performance of impulse voltage generator. The synchronism characteristics of above MV stage generators are especially important. Synchronism characteristics of a 24-stage impulse voltage generator (4800kV) are analyzed and three measures are taken to improve the range of generator in this paper.
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