基于零序直流原理的电缆测距研究  

Study on fault location based on zero sequence DC

作　　者：徐铮[1] 袁振海[1] 饶日嵩[1] 房东贤[1] 

机构地区：[1]南京工业大学自动化学院,江苏南京210009

出　　处：《电力系统保护与控制》2009年第23期45-50,83,共7页Power System Protection and Control

摘　　要：研究了零序直流保护原理在小电流接地系统单相接地故障测距中的应用。利用直流信号不受电网电容影响的特性,建立检测源与接地网电路模型。将分时段的电路模型等效为全周期的有效值电路模型,并根据其模型抽象出数学模型。同时,根据电缆规范要求选取实验电路参数,建立仿真电路模型。根据实验数据,对该模型进行分析,结果表明网络模型能够准确、可靠地实现故障测距。同时,为传统选线的零序直流原理开拓了一个新的应用。This paper studies on principle of zero sequence DC in fault location of single-phase grounded fault of non-effectively earthed system. Moreover, a model of DC single and grounding grid is established with the morse theory and the characteristic of DC signal. According to the model, the model of the fault location system is established. According to the criterion of cable, the model of experiment is established based on MATLAB. Comparing the model of math through the data of whole experiment, it is demonstrated that this principle of mathematic model could select the fault line accurately and reliably. At the same time, the traditional zero sequence DC line selection theory is pushed to a virginal field--fault location.

关 键 词：零序直流 有效值电路 故障测距 仿真 

分 类 号：TM755[电气工程—电力系统及自动化]