The impact of harmonic frequencies on electrical tree growth in epoxy resin
The impact of harmonic frequencies on electrical tree growth in epoxy resin
复制标题
谐波频率对环氧树脂电树生长的影响
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
S. Rowland
中科院分区：
文献类型：
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作者：
I. Iddrissu;S. Rowland
固体聚合物绝缘中的电气树是内部损坏的物理证据，并最终导致设备故障。本研究考虑频率对环氧树脂中树桩击穿次数在50 Hz至450 Hz之间的影响。从50到~ 250 Hz产生的树形结构是丝状的，具有狭窄的通道，分布在整个绝缘材料中。从~ 250 Hz到450 Hz产生的树形结构颜色更深，具有更宽的通道和更少的分支。树的萌发和繁殖速度随着频率的增加而增加，从而减少了崩溃的时间。这意味着交流和直流网络中的谐波需要仔细管理，以确保绝缘可靠性不会受到损害。
Electrical treeing in solid polymeric insulation is physical evidence of internal damage and ultimately leads to equipment failure. This study considers the effect of frequency on treeing breakdown times in epoxy resin between 50 Hz to 450 Hz. The tree structures generated from 50 to ∼250 Hz were filamentary, had narrow channels and spread throughout the insulation. Tree structures generated from ∼250 Hz to 450 Hz were darker, having wider channels and less branching. The rate of tree initiation and propagation increases with increasing frequency, resulting in reduced time to breakdown. This has implications that harmonics in AC and DC networks require careful management to ensure insulation reliability is not compromised.