摘要
因三芯电力电缆稳态运行时传输的三相电流之和为0,以传统的电流互感器无法测量出其中各芯线即各相电流,该文从表征通流状态下三芯电力电缆中各处电磁特性的电磁场方程出发,提出一种三芯电力电缆表面磁场的解析计算方法,其不仅适用于对称三芯电缆,还适用于其他电缆三芯任意分布的情形。基于该解析算法,通过测量三芯电缆表面的磁场,就可以较准确地实现对三芯电力电缆各芯线电流的测量。以该解析模型进行计算和采用有限元仿真模型计算的结果均表明,所提出解析算法具有较好的准确性,对构建新型电缆在线监测系统具有理论指导价值。
Since the sum currents of three phases in the three-core cable is zero in steady state, traditional inductive current measurement methods, a current transformer, cannot measure the phase current. In order to solve this problem, this paper developed an analytical method for calculating the magnetic field on the surface of a three-core cable based on Maxwell equations which can be used for the generalized core contribution case rather than a symmetrical condition. Based on this analytical method, the phase current of the three-core cable can be represented by measurements of the magnetic field on the cable surface. The finite element simulations show that the presented analytical method has a good accuracy, and can be employed in future to realize an online power cable monitoring system.
出处
《中国测试》
北大核心
2017年第4期95-99,共5页
China Measurement & Test
关键词
电力电缆
磁场计算
解析模型
电流测量
electrical power cable
magnetic field calculation
analytical model
current measurement
