电缆外护层接地电流校准及不确定度评定

针对传统电缆外护层接地电流监测仪的校准过程主要在实验室参比条件下,未考虑到现场环境中存在背景泄漏电流的干扰,提出了一种基于零磁通原理与置空后注入标准信号相结合的在线校准方法。在不断电和不拆卸相关设备的情况下消除了背景泄漏电流对校准过程的影响,对监测仪校准结果的不确定度进行详细分析和评定,基于监测仪的工作原理和测试方法,通过传递比较法,验证了校准结果的可信度和不确定度的合理性。

Ground current calibration and uncertainty evaluation of outer sheath

Aiming at the traditional calibration process of grounding current monitor for outer cable sheathing, the interference of background leakage current in field environment is not considered under the laboratory reference conditions. A zero-flux principle and space- After the injection of a standard signal combination of on-line calibration method, without removing the relevant equipment, the background leakage current to eliminate the impact of the calibration process, the monitor calibration results of the uncertainty of a detailed analysis and assessment based on monitoring The working principle and testing method of the instrument verify the rationality of the credibility and uncertainty of the calibration result through the method of passing comparison.