摘要
电力电缆出厂试验以及现场离线试验进行局部放电测试时,均采用以皮库(pC)表征的视在放电量来评价其绝缘水平。文中采用内置电容耦合方法进行XLPE电缆局部放电的带电检测,为了使检测结果与出厂试验等离线试验结果能够进行对比,将检测结果以视在放电电荷量形式呈现,需要提出该方法的校准方法。论文采用内置电容耦合法对基于等效电容作为分度电容的带电校准、基于频率响应的带电校准以及基于电缆等效电路仿真的带电校准等3种在线校准方法进行研究,并在实验室35 kV电缆上与IEC 60270:2000标准中规定的端部校准方法进行对比分析。实验结果显示,由于考虑了传感器与电缆金属护套间的杂散电容Cs,基于电缆等效电路仿真的内置电容耦合传感器的带电校准方法获得的校准系数准确度更高与标准端部校准有较好的吻合度。
During factory test and off-line test in field, the apparent charge quantity is expressed in picocoulomb （pC）. A novel online calibration method based on the simulation of inner capacitive coupling equivalent circuits is p apparent charge for the method is performed in methods, and compared taking the stray , to convert the measured results into the form of the quantity of the comparison with the results obtained from the off-line tests. The online calibration laboratory on a 35 kV XLPE cable along with two other online calibration with the terminal calibration method according to IEC 60270：2000 standard. By capacitance Cs into consideration, the resuhs prove that the scale factor obtained by the novel method has good fit with that obtained by the standard method better.
出处
《高压电器》
CAS
CSCD
北大核心
2017年第6期129-134,140,共7页
High Voltage Apparatus
关键词
局部放电
XLPE电缆
电容耦合
带电检测
校准
partial discharge
XLPE power cable
capacitive coupling
online detection
calibration
