【摘要】 精确地测量、准确地跟踪是自动消弧装置精确补偿系统电容电流、有效熄灭接地点电弧的前提和基础。在模拟试验和现场运行经验的基础上,分析了影响电容电流测量精度的几个问题,如接地变压器的零序阻抗、系统阻尼率、互感器二次负载、启动采样时机的选取,提出了修正公式和应对措施;讨论了跟踪的灵敏度和准确度问题。更多还原

【Abstract】 Precisely measuring and tracing is the premise and the basis for automatic arc-suppression devices to accurately compensate the capacitive current and effectively extinguish the grounding arc in distribution networks. This paper analyzes several problems on measurement in detail, which are usually neglected in practice, such as the zero-sequence impedance of the grounded transformer, the damp rate of the system, the secondary loads of the inductors and the selection of the startup sampling time, and presents revised formulas and countermeasures. The sensitivity and accuracy of tracing capacitive current are also discussed.更多还原