摘要
为评估运行电缆的绝缘状态,设计了一套基于Lab VIEW的冲击电压及冲击电流的测量系统,在此基础上,提出了有功损耗评估电缆绝缘状态的方法。测量系统采用两级分压的低阻尼阻容串联分压器作为电压传感器,空心罗氏线圈作为电流传感器,DS6104示波器作为数据采集装置,通过Lab VIEW软件平台实现对示波器的控制及数据的采集和存储。测量结果表明该系统能够实现对冲击电压和冲击电流的自动同步采集和存储,波形无振荡、无畸变。通过测量水树老化电缆的冲击电压和冲击电流数据并进行数值积分,得到冲击下的有功损耗。与介质损耗正切值测量结果对比,发现两种评估手段的结论是一致的,表明有功损耗能够良好地反映电缆的绝缘状态。
In order to assess the cable insulation conditions,a measurement system is designed to acquire the data of the impulse voltage and surge current based on Lab VIEW,and a method of active power loss is proposed for the evaluation of insulation condition of the cable. A low damping resistance-capacitance series voltage divider based on two-stage division is designed as the voltage sensor,and a hollow Rogowski coil is designed as the current sensor. The DS6104 oscilloscope is designed as a data acquisition device,and the Lab VIEW software platform is used to control the oscilloscope and acquire and store data. The measurement system can automatically and synchronously acquire and store the data of the impulse voltage and surge current without oscillation and distortion. The data of impulse voltage and surge current is measured,and numerical integration is calculated to obtain active power loss of the water tree aging cable. The active power loss and the dielectric loss are consistent for the same cables samples. It indicates that the active power loss can assess the cable insulation conditions.
出处
《电测与仪表》
北大核心
2016年第23期28-33,共6页
Electrical Measurement & Instrumentation
