所加电压幅值减小，放电电流减小。
The discharge current becomes small with decreasing voltage amplitude applied.
同时，还给出了计算正弦电压幅值的瞬时计算实用公式。
This paper also lists a formula that can calculate the amplitude of sine voltage instantaneously.
杆塔较高和导线上工作电压幅值大，可能是较重要的因素。
The higher tower height and larger system voltage may be important factors.
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