为了研究竖直和倾斜情况下绝缘子的体型系数，在风洞中通过模型测力和自由风偏方法进行研究，获得了竖直情况绝缘子体型系数随风速和湍流度的变化，提出了利用自由风偏测试倾斜情况下绝缘子体型系数的方法，研究了自由风偏情况下复合绝缘子的脉动风偏特征和体型系数，给出了盘式和复合绝缘子体型系数的建议值。研究表明：竖直情况下绝缘子体型系数随着风速的增大呈减少的趋势；不同湍流度下绝缘子的体型系数比较接近；悬挂绝缘子在湍流下可见显著的正弦波动，在均匀流下波动并不显著；湍流场下悬挂绝缘子平均风偏角大于均匀流，且风速越大差距越显著；建议盘式绝缘子的体型系数取0.89（竖直情况），复合绝缘子的体型系数取0.93（竖直情况）和1.00（倾斜情况），该建议值与中国规范比较接近，小于IEC、EN和JEC规范的结果。
Abstract
In order to study shape coefficient of vertical and inclined insulators, the model force measurement and free wind deflection method were used in wind tunnel tests.The variation of shape coefficient of vertical insulators with wind speed and turbulence degree varying was obtained.The method of measuring shape coefficient of inclined insulators using free wind deflection was proposed, and fluctuating wind deflection characteristics and shape coefficient of composite insulators under free wind deflection were studied.Finally, the recommended values of shape coefficients for disc and composite insulators were given.The results showed that the shape coefficient of vertical insulator decreases with increase in wind speed; shape coefficients of insulator under different turbulence degrees are closer to each other; the suspended insulator has significant sinusoidal fluctuation under turbulence, but its fluctuation is not significant under uniform flow; the average wind deflection angle of suspended insulator under turbulence is larger than that under uniform flow, and the larger the wind speed, the more significant the difference; the recommended shape coefficient value for vertical disc insulator is 0.89, those for vertical composite insulator and inclined one are 0.93 and 1.00, respectively; these recommended values are closer to those in Chinese code and smaller than those in IEC, EN and JEC codes.
关键词
绝缘子 /
体型系数 /
风洞试验 /
脉动风偏 /
风偏角
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Key words
insulator /
shape coefficient /
wind tunnel test /
fluctuating wind deflection /
wind deflection angle
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