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首页> 外文期刊>Electrical engineering in Japan >A New Water Electrode Method for Short-Time Testing of Water Treeing and Consideration of Temperature Effects of Water Tree Initiation and Propagation
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A New Water Electrode Method for Short-Time Testing of Water Treeing and Consideration of Temperature Effects of Water Tree Initiation and Propagation

机译：水树短时测试的新水电极方法及考虑水树引发和传播的温度效应

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摘要

Water treeing occurs when an AC voltage is applied to an electrical insulation system such as those in power cables and power apparatus. From a practical viewpoint, research on water treeing has mostly been performed under high-frequency AC voltage application. However, power cables and power apparatus are also used under DC voltage application owing to progress in inverter technology. Inverter drive of rotating electrical machines has spread and expanded for global warming prevention and maintenance improvement. Underwater motors are used in water. In an underwater motor driven by the voltage of an inverter, it is necessary to consider water treeing of the motor insulation and cable insulation connected with a drive board. Thus far, a water electrode method that utilizes an AC voltage of high frequency has been used in the accelerated water treeing experimental method for a long time. On the other hand, an inverter with a surge voltage generates an equivalent AC frequency by the application of a multifrequency pulse voltage similar to a pulse width modulation (PWM) control wave. Therefore, there is a possibility of mistakes in real-machine reliability evaluation because the initiation and propagation mechanisms are different from those in a real machine, even if we can reproduce water treeing by increasing the basic frequency. This paper reports our investigation of a new water electrode method and of temperature effects on water tree initiation and propagation. We also compare experimental results between 500 Hz and 50 Hz using the new water electrode method from the viewpoint of temperature.
机译：当将交流电压施加到电气绝缘系统（如电缆和电力设备中的绝缘系统）时，就会出现水树。从实践的角度来看，对水树的研究主要是在高频交流电压的应用下进行的。但是，由于逆变器技术的进步，在直流电压下也要使用电力电缆和电力设备。旋转电机的变频器驱动已经扩展并扩展，以防止全球变暖并改善维护。水下电机用于水中。在由逆变器的电压驱动的水下电动机中，必须考虑电动机绝缘体和与驱动板连接的电缆绝缘体的水树。迄今为止，在加速的水树实验方法中长期以来一直使用利用高频交流电压的水电极法。另一方面，具有浪涌电压的逆变器通过施加类似于脉冲宽度调制（PWM）控制波的多频脉冲电压来产生等效的AC频率。因此，即使我们可以通过增加基本频率来再现水树，由于启动和传播机制与实际机器不同，因此在实际机器可靠性评估中可能会出错。本文报告了我们对一种新的水电极方法以及温度对水树引发和繁殖的影响的研究。从温度的角度，我们还使用新的水电极方法比较了500 Hz和50 Hz之间的实验结果。

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