Electrical Tree Growth in LDPE: Fine Channel Development During Negative DC Ramp Down
Electrical Tree Growth in LDPE: Fine Channel Development During Negative DC Ramp Down
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LDPE 中的电树生长：负直流斜坡下降期间的精细通道发展
DOI：
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发表时间：
2022
影响因子：
3.1
通讯作者：
V. Peesapati
中科院分区：
文献类型：
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作者：
Fang Liu;S. Rowland;Hualong Zheng;V. Peesapati
本文确定了高压直流（HVDC）聚乙烯绝缘的威胁所造成的罚款电气树去除高直流电压的增长。这种优良的树已确定以前在交流电压下生长，特别是在玻璃状环氧树脂。然而，细树生长被区分为与可测量的局部放电（PD）无关，因此对高压（HV）系统完整性提出了特别的威胁。在报告的情况下，罚款树被认为是从较小的传统的黑暗的树木生长在低密度聚乙烯（LDPE），在去除负直流电压。即使在许多秒内相对缓慢地斜降的情况下也可以看到增长。一棵好树的生长使系统在重新通电时可能容易迅速老化。对于电缆系统，威胁在于这样的树将增长，并且对于使用传统PD测量方法的资产管理者基本上是不可见的。
This article identifies the threat to high-voltage direct current (HVDC) polyethylene insulation posed by the growth of fine electrical trees on the removal of high dc voltages. Such fine trees have been identified previously growing under ac voltages, especially in glassy epoxy resins. However, fine tree growth is distinguished as not being associated with measurable partial discharges (PDs) and so presents a particular threat to high-voltage (HV) system integrity. In the case reported, fine trees are seen to grow in low-density polyethylene (LDPE) from smaller traditional dark trees, on the removal of a negative dc voltage. The growth is seen even in the case of a relatively slow ramp down over many seconds. The growth of a fine tree leaves the system potentially vulnerable to rapid aging when re-energizing. For cable systems, the threat is that such a tree will grow and is essentially invisible to asset managers using the traditional method of PD measurement.