27.5 kV电缆是牵引供电系统的重要供电设施,其运行状况直接关系到牵引供电系统对运输能力的影响.通过分析27.5 kV电缆的接地方式和工程应用情况,对护层保护器的参数进行合理选择,选择时应充分考虑电缆外护套绝缘水平随着时间的推移而下降的实际情况,结合护层保护器的额定电压、动作电压、残压等关键技术参数,综合考虑各参数之间关联和制约因素,合理选择.%27. 5kV cable is the important power supply equipment in traction power supply system, and its performance is directly related to the effect of traction power supply system on traffic capacity. To choose the protector of cable sheath reasonably, based on analysis for application situation and grounding method of 27. 5kV cable, this paper suggests that: the actual situation of insulation levels of outer cable sheath which decline over time should be fully considered; and the interactions and constraint factors among various parameters should also be considered comprehensively in combination with the rated voltage, operating voltage, residual voltage and other key technical parameters of the protector.
展开▼
