【摘要】 高压直流输电系统的操作过电压持续时间长、释放的能量大,为提高避雷器的能量吸收能力,高压直流避雷器一般采用多柱电阻片并联的结构,柱间电流分布的均匀程度直接影响避雷器的整体能量吸收能力。本文选用国内3个避雷器生产厂家的电阻片,试验研究了电阻片整体温升及柱间温差对电流分布特性的影响。研究结果表明,当电阻片温度整体升高时,虽然不同厂家电阻片的电流分布不均匀系数随温度变化的规律具有一定的差异,但由此引起的最大电流分布不均匀系数并不会超过标准限值;当柱间温差增加时,3个厂家电阻片的电流分布不均匀系数均表现出随柱间温差的增加而增大的趋势。更多还原

【Abstract】 The switching overvoltage in HVDC power system usually has long duration and discharge more energy than normal stations. The multi-column surge arresters are usually used to improve energy absorption ability, which affected by the current disparity among columns. The author studies the effects of temperature on current disparity of multi-column arresters selected from three manufacturers. Two different types of experiments were carried out, including uniform and non-uniform temperature rise. The research results show that although the characteristic of current disparity with temperature make a difference between different manufacturers, when the temperature of the valve plate is rise as a whole, the max-disparity coefficient does not exceed the standard limit. When the temperature difference between the columns increases, the uneven-coefficient of current distribution of valve plates increases with the increase of temperature.更多还原