Fundamental research of the polymer dissolved ultrapure water applied to composite insulation

在0.055 μ S / cm的超纯水中，我们发现介电电场在14 kVrms /mm处几乎是恒定的。纯水的介电击穿场随着电导率的增加而趋于减小。通过添加（甲基纤维素25）聚合物抑制水的电导率的增加。 通过添加聚合物（甲基纤维素25）的水的介电击穿场与超纯水基本相同。我们进行了介电击穿测试与复合绝缘结构使用PFA涂层电极。我们发现有必要使用具有高击穿电场的涂层材料，或者有必要使用相对厚的涂层材料。

In ultrapure water of 0.055 micro S / cm, we found that dielectric electric field is nearly constant at 14 kVrms / mm. Dielectric breakdown field of pure water was found to tend to decrease with increasing conductivity. Suppress the increase in conductivity of the water by adding (methylcellulose 25) polymer. Dielectric breakdown field of the water by adding polymer (methylcellulose 25) was substantially the same with ultrapure water. We performed the dielectric breakdown test with a composite insulating structure using a PFA coated electrode. We found that it is necessary to use a coating material having a high breakdown electric field, or it is necessary to use a relatively thick coating material.