Wire-Plane Electrode System for Electrical Tree Initiation Exposed to AC and DC Voltage Stress
Wire-Plane Electrode System for Electrical Tree Initiation Exposed to AC and DC Voltage Stress
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用于暴露于交流和直流电压应力下的电树启动的线平面电极系统
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
S. Gubanski
中科院分区：
文献类型：
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作者：
A. Johansson;A. Sandberg;B. Sonerud;J. Blennow;S. Gubanski
利用实时光学检测和显微镜观察，在线平面电极几何结构中分析了暴露于直流（两种极性）和50 Hz交流电压下的XLPE的电树结构。研究发现，在交流和直流应力下，树形机制不同。对于交流电压，在测试过程中可以很容易地实时观察到树的起始和生长情况。在直流应力的情况下，在使用CCD相机识别电树之前，XLPE发生完全击穿。然而，在标本的显微观察中，可以区分出非常精细的树状结构。还分析了电压斜坡率的影响。对于交流应力，更快的斜坡导致更高的树起始电压。对于直流应力，相反的趋势是正确的，其中更快的斜坡导致更低的击穿电压水平。当比较直流击穿电压对极性的影响时，负极性比正极性产生更高的电压水平。
Electrical treeing in XLPE exposed to DC (of both polarities) and 50 Hz AC voltages has been analysed in a wire-plane electrode geometry using real-time optical detection and microscopic observations. It has been found that treeing mechanisms differ between AC and DC stresses. For AC voltage, the tree initiation and growth is easily observable in real time during the testing. In the case of DC stress a complete breakdown of the XLPE occurs before electrical trees can be discerned with the use of CCD camera. However, in the microscopic observations of the specimens, very fine tree structures can be distinguished. The effect of voltage ramping rate was also analysed. For AC stress, the faster ramping results in a higher tree inception voltage. The opposite trend is true for DC stress, where the faster ramp results in a lower breakdown voltage level. When comparing the effect on polarity of the DC breakdown voltage, negative polarity results in higher voltage levels than positive polarity.