摘要
首先采用灵敏度方法以电缆稳态热路模型为基础,分析了降低护层环流的重要性。在此基础上,根据电磁感应基本定律,采用在护层接地回路串接电感装置的方式对护层环流进行补偿。结合具体工程实践,从电感铁芯尺寸、绕组导线选择等方面给出了装置设计的详细步骤与具体方法。并进一步指出:装置感应电压与护层感应电压的相位偏差随着护层分段的改变而改变,进而影响护层环流的补偿效果。分析装置本身感应电压的气隙特性和匝数特性得出:感应电压与气隙长度为非线性关系,与绕组匝数成线性增加关系。通过一组工程实践数据验证该装置补偿方式的准确性和可行性。
Based on the static thermal circuit model,the sensitivity analysis method is applied to analyze the importance of reducing the metal shield circulating current,and according to the fundamental law of electromagnetic induction,it is proposed to compensate the circulating current by inserting an inductance device into the metal shield grounding circuit. Combined with an engineering practice,the detailed steps and specific method of compensation device design are given,including the size of inductor core and winding conductor. It is further pointed out that,the phase deviation between the induction voltage of compensation device and that of metal shield changes along with the change of metal shield segmentation,which influences the effect of circulating current compensation. The air-gap and winding-turns characteristics of compensation device are analyzed,which show that,the relationship between induction voltage and air gap length is nonlinear and that between induction voltage and winding turns is linear. The accuracy and feasibility of the proposed compensation method are verified by the engineering practice data.
出处
《电力自动化设备》
EI
CSCD
北大核心
2015年第4期151-155,共5页
Electric Power Automation Equipment
基金
江苏省电力公司2014年重点科技项目(J2014055)~~
关键词
电缆
稳态热路
金属护层
环流
补偿
设计
模型
感应电压
灵敏度分析
cables
static thermal circuit
metal shield
circulating current
compensation
design
models
induction voltage
sensitivity analysis
