交流特高压支柱瓷绝缘子的自然积污特性研究

为研究特高压支柱瓷绝缘子的自然积污规律,重点对荆门特高压变电站运行的支柱瓷绝缘子进行了连续3 a的积污检测。测量了盐密(equivalent salt deposit density,ESDD)、灰密(non soluble deposit density,NSDD)及污秽成分,对比分析了伞裙上表面与下表面、迎风面与背风面、平均直径、连续积污等对支柱绝缘子自然积污特性的影响规律。结果表明,1 a的积污期条件下(2010年4月至2011年4月):1)单个1000k V支柱瓷绝缘子整柱污秽分布较不均匀,高压端与其他部位的ESDD平均比值为3.4,NSDD平均比值为2.3。2)绝缘子伞裙上表面污秽度普遍高于下表面。上下表面ESDD不均匀积污比平均为1.8,上下表面NSDD不均匀积污比平均为1.6。3)绝缘子伞裙背风面污秽度普遍高于迎风面。ESDD迎风面与背风面不均匀积污比平均为0.64,NSDD迎风面与背风面不均匀积污比平均为0.55。4)饱和ESDD与连续积污时间不成正比关系,而NSDD基本与连续积污时间成正比关系。5)ESDD和NSDD随平均直径的增大呈下降趋势。6)绝缘子表面污秽物中CaS O4含量平均为68%。研究结果可为我国特高压工程外绝缘设计、产品制造和运行检修提供参考。

Experimental study on the degradation of Rhodamine B by hydrodynamic cavitation technique

Hydrodynamic cavitation is a new technique in wastewater treatment processes. The degradation of Rbodamine B was studied on a 220 liters hydrodynamic cavitation setup using multiple hole orifice plates in this paper. The experimental results showed that Rhodamine B was really decomposed by hydrodynamic cavitation. Some factors influencing degradation effect i.e. geometric parameters and operation conditions also were discussed. It was concluded there was the optimal ratio of total area of holes to crosssectional area of the pipe and the rate constant increased with a reduction in the value of the modified cavitional number.