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特高压电晕笼防护段的设计(4)

关键词: 特高压 电晕

3 结 论

a)不考虑导线弧垂时,为了克服端部效应对导线表面电场的影响,特高压电晕笼防护段的长度至少应为2m;考虑导线弧垂后,端部效应对导线表面电场的影响更加突出,防护段的最小长度有所增加。

b)随着导线弧垂的增大,电场无畸变段的长度不断减小,防护段的长度随之增大。实际导线的弧垂不宜过大,以免电场无畸变段的长度过小而影响测量结果的准确性。因此,在实际电晕笼试验中,为了保证足够的测量准确度,特高压电晕笼内导线的弧垂宜≤60cm,防护段长度应≥5m。

c)新型防护段结构设计可有效抑制由于端部效应引起的电晕笼端部处导线表面电场的降低,改善导线表面电场分布,使特高压电晕笼内导线表面电场无畸变段的长度从26m增至30m。

d)合理设计防护段可使整个笼内的导线表面电场趋于一致,从而提高电晕特性试验的准确性。

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