【摘要】 单芯电缆的结构参数和运行环境影响都会导致电缆的无功损耗变化。为了探究单芯电缆结构和运行环境对电缆无功损耗的影响,文中从电缆内部结构出发,建立了电缆等效电路模型。通过分析电缆内部无功损耗形式,研究了单芯电缆在特殊工况下的无功损耗变化情况。结果表明:单端接地电缆内部损耗以容性无功损耗为主;电缆电压等级越高时,输送一定功率的极限传输距离反而越短,并给出了66、110、220、330、500 kV电缆的极限传输距离;电缆内部进水后容性无功损耗会增大10%～30%,电压等级越高或者电缆截面积越大,进水后造成的无功损耗增量越大;电缆无功损耗增量与电缆线芯偏心度的二次方成正比,相同偏心度下,额定载流量大的电缆,无功损耗增量更大。文中的研究成果可用于单芯电缆特殊工况下无功损耗的计算及为无功补偿提供参考。更多还原

【Abstract】 The structure parameters and operation environment of single-core cable can lead to reactive power loss variation of the cable.In order to explore the influence of structure and operating environment of single-core cable on the reactive power loss of cables,the equivalent circuit model of cable is set up based on the internal structure of cable in this paper.The variation of reactive power loss of single-core cable under special working condition is studied through analyzing the form of reactive power loss inside the cable.The results show that the main internal loss of singleended grounded cable is capacitive reactive power loss.The higher the voltage level of cable is,the shorter the ultimate transmission distance of certain power is,and the ultimate transmission distance of 66 kV,110 kV,220 kV,330 kV and 500 kV cable is given.The capacitive reactive power loss can increase by 10%～30% after penetration of water inside the cable.The higher the voltage level or the larger the cross-section area of the cable is,the greater the increment of reactive power loss after water penetration is.The increment of reactive power loss of cable is proportional to the quadratic square of eccentricity of cable core.Under the same eccentricity,the increment of reactive power loss of cable with large rated carrying capacity is larger.The study results of this paper can be used to calculate the reactive power loss of single-core cable under special working condition and provide reference for reactive power compensation.更多还原