压力波法模型电缆空间电荷测试研究

Study on Space Charge Measurement of Model Cable by Pressure Wave Propagation Method

根据压力波法空间电荷测量的基本原理,研制了一套可用于模型电缆试样的压力波(PWP)法空间电荷测试装置。该装置具有高于PEA法的信噪比,原始信号无需处理即可用于空间电荷性能分析。利用此装置分别对交流和直流XLPE电缆进行了空间电荷测试。结果表明:随着外加电场的升高,空间电荷明显增多。另外,直流电缆绝缘中的空间电荷明显小于交流电缆绝缘中的空间电荷。

A new space charge measurement system for model cable was developed according to the test principle of pressure wave propagation （PWP） method. The PWP method has higher signal-to-noise ratio than that of PEA method, and the original signals can be directly used in space charge analysis without treatment. The space charge of AC and DC cable was measured respectively by this system. The results show that with the increase of external field, the space charge increases obviously, and the quantity of space charge in DC cable is less than that in AC cable.