电力电缆故障冲闪测试放电回路建模  

Modeling of surge discharge circuit for power cable fault locator

作　　者：李峰[1] 徐丙垠 

机构地区：[1]合肥工业大学仪器科学与光电工程学院,安徽合肥230009 [2]山东科汇电力自动化有限公司,山东淄博255087

出　　处：《电力自动化设备》2011年第3期46-51,共6页Electric Power Automation Equipment

摘　　要：对电力电缆故障冲击高压闪络测试(简称冲闪测试)系统的放电响应进行了研究。在只考虑暂态低频分量信号的条件下,利用电缆的均匀传输线T型等效网络,建立了冲闪测试放电回路的集中参数电路模型。根据电缆的结构和材料参数,以及电缆集中参数与其分布参数之间的关系,推导了模型的电流、电压响应近似表达式,以及电流响应的衰减系数和振荡频率表达式。论证了冲闪测试放电回路串联电阻为零时电流、电压响应近似为二阶衰减振荡过程,二次脉冲法冲闪测试放电回路串联电阻不为零时电流响应是过阻尼的负指数衰减过程。模型计算与实验结果的一致性验证了建模的正确性。The current and voltage response of surge discharge circuit to impulse flashover voltage test system is analyzed.When only low frequency transient components are considered,the lumped parameter model of the surge discharge circuit of power cable fault locator is constructed based on the T-type equivalent network of uniform transmission line.According to the geometry and material specifications of power cable,as well as the relationship between its lumped and distributed parameters,the approximate expressions of current and voltage response,as well as the expressions of current attenuation coefficients and oscillation frequency of current response,are deduced.When the series resistance in surge discharge circuit is zero,the current and voltage response are approximately the second-order decaying vibration process.When the series resistance is not zero,the current response to the secondary impulse method is the over-damped negative-exponent decaying process.The results of model calculation are consistent with the experimental results,verifying the correctness of the modeling.

关 键 词：电力电缆 故障测距 冲闪测试 放电回路 二次脉冲法 

分 类 号：TM247[一般工业技术—材料科学与工程]