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The characteristics of electrical trees in the inner and outer layers of different voltage rating XLPE cable insulation

The characteristics of electrical trees in the inner and outer layers of different voltage rating XLPE cable insulation
The characteristics of electrical trees in the inner and outer layers of different voltage rating XLPE cable insulation
The statistical initiation and propagation characteristics of electrical trees in cross-linked polyethylene (XLPE) cables with different voltage ratings from 66 to 500 kV were investigated under a constant test voltage of 50 Hz/7 kV (the 66 kV rating cable is from UK, the others from China). It was found that the characteristics of electrical trees in the inner region of 66 kV cable insulation differed considerably from those in the outer region under the same test conditions; however, no significant differences appeared in the 110 kV rating cable and above. The initiation time of electrical trees in both the inner and the outer regions of the 66 kV cable is much shorter than that in higher voltage rating cables; in addition the growth rate of electrical trees in the 66 kV cable is much larger than that in the higher voltage rating cables. By using x-ray diffraction, differential scanning calorimetry and thermogravimetry methods, it was revealed that besides the extrusion process, the molecular weight of base polymer material and its distribution are the prime factors deciding the crystallization state. The crystallization state and the impurity content are responsible for the resistance to electrical trees. Furthermore, it was proposed that big spherulites will cooperate with high impurity content in enhancing the initiation and growth processes of electrical trees via the ‘synergetic effect’. Finally, dense and small spherulites, high crystallinity, high purity level of base polymer material and super-clean production processes are desirable for higher voltage rating cables.
0022-3727
1-10
Xie, Ansheng
3b0df7b4-f157-424f-9f06-6e43be1a7a1f
Li, Shengtao
e2d199c9-1c0c-40c8-aefb-ff3b3d8e4799
Zhwng, Xiaoquan
39497b1d-594f-4a91-a848-6d544d46789e
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Xie, Ansheng
3b0df7b4-f157-424f-9f06-6e43be1a7a1f
Li, Shengtao
e2d199c9-1c0c-40c8-aefb-ff3b3d8e4799
Zhwng, Xiaoquan
39497b1d-594f-4a91-a848-6d544d46789e
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819

Xie, Ansheng, Li, Shengtao, Zhwng, Xiaoquan and Chen, George (2009) The characteristics of electrical trees in the inner and outer layers of different voltage rating XLPE cable insulation. Journal of Physics D: Applied Physics, 42 (125016), 1-10.

Record type: Article

Abstract

The statistical initiation and propagation characteristics of electrical trees in cross-linked polyethylene (XLPE) cables with different voltage ratings from 66 to 500 kV were investigated under a constant test voltage of 50 Hz/7 kV (the 66 kV rating cable is from UK, the others from China). It was found that the characteristics of electrical trees in the inner region of 66 kV cable insulation differed considerably from those in the outer region under the same test conditions; however, no significant differences appeared in the 110 kV rating cable and above. The initiation time of electrical trees in both the inner and the outer regions of the 66 kV cable is much shorter than that in higher voltage rating cables; in addition the growth rate of electrical trees in the 66 kV cable is much larger than that in the higher voltage rating cables. By using x-ray diffraction, differential scanning calorimetry and thermogravimetry methods, it was revealed that besides the extrusion process, the molecular weight of base polymer material and its distribution are the prime factors deciding the crystallization state. The crystallization state and the impurity content are responsible for the resistance to electrical trees. Furthermore, it was proposed that big spherulites will cooperate with high impurity content in enhancing the initiation and growth processes of electrical trees via the ‘synergetic effect’. Finally, dense and small spherulites, high crystallinity, high purity level of base polymer material and super-clean production processes are desirable for higher voltage rating cables.

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Published date: June 2009
Organisations: Electronics & Computer Science, EEE

Identifiers

Local EPrints ID: 267538
URI: https://eprints.soton.ac.uk/id/eprint/267538
ISSN: 0022-3727
PURE UUID: b38e2fb6-d537-4f4e-bb24-587e703f8e29

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Date deposited: 09 Jun 2009 11:04
Last modified: 19 Jul 2019 22:18

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