平行多回电缆序阻抗参数的计算与分析  

Calculation and Analysis of Sequence Impedances for Parallel Multi-circuit Cable Lines

作　　者：王育学[1] 张哲[1] 尹项根[1] 孔祥平[1] 邓星[1] 蒙绍新[2] 赵健康[2] 

机构地区：[1]电力安全与高效湖北省重点实验室(华中科技大学),湖北省武汉市430074 [2]国网电力科学研究院,湖北省武汉市430074

出　　处：《电网技术》2011年第8期186-191,共6页Power System Technology

基　　金：国家自然科学基金项目(50877031;50837002)~~

摘　　要：电缆序阻抗参数的准确计算是进行电缆工程设计的重要基础。平行多回电缆间由于电磁耦合的影响,其序阻抗参数的计算方法不同于单回路电缆。以"单导线–大地"回路为基础,提出了一种新的平行多回电缆序阻抗参数计算方法。该方法将金属护套与电缆芯线同等看待,分别与大地构成"护套–大地"回路和"芯线–大地"回路,充分考虑了护套电流以及各回电缆之间耦合作用的影响,同时实现回路间解耦,得到综合等值序阻抗参数,仿真算例验证了该方法的正确性。基于上述方法,以平行2回电缆为例,对不同敷设方式下序阻抗参数的变化特点进行比较分析。Accurate calculation of sequence impedance parameters of cable line is vital to the design of cable line project. Due to electromagnetic coupling among parallel cables, the calculation of their sequence impedance parameters is different from that of single cable. Based on single conductorground circuit, a new algorithm of sequence impedance parameters for parallel multi-circuit cable lines, in which four common types of cable metal sheath grounding modes are taken into account, is proposed. In the proposed algorithm the cable conductor and metal sheath of the cable are treated coequally, and with ground they constitute sheath-ground loop and core-ground loop respectively, and the influence of the currents in the sheathes and that of electromagnetic coupling among cable conductors are adequately considered and the decoupling among cable lines is performed to obtain synthetical equivalent sequence impedance parameters. The correctness of the proposed method is verified by results of simulation examples. Based on the proposed method and taking two parallel cable lines for example, the comparison and analysis of variation characteristics of sequence impedance parameters under different laying ways.

关 键 词：多回电缆 序阻抗参数 电磁耦合 金属护套 接地方式 

分 类 号：TM93[电气工程—电力电子与电力传动]