Approach to Fixing Installation of E/UHV Grading-Rings with Hold-Hoops in Extreme Environments

doi:10.11985/2016.09.005

Abstract

Abstract:

Against the welding cracking of the grading ring fixed by welding way in E/UHV grid, an alternativeapproach to fixing installation by holding hoop is proposed. The modeling calculation analysiswas adopted to find the main factors and choose the design parameters of the hold hoop, and its selection reasons and ranges are also decided. To theaberrance of the local electric field resulted from the hold-loops installation, the theory of insulation coating technology wasappliedto analyze the relationship among the maximal field strength, coating thicknessand dielectric constants, so the dual cladding optimization measurement of electric rubber and insulation rubber wasbrought forward and validated by modeling calculation. The results show thatthe grading ring with hoop installation way sufficesthe technical requirements of engineering application.

Key words: Welding way, welding cracking, holding hoop, insulation coating, grading rings

CLC Number:

TM721.1

Dingqian Yang,Wei Li,Yun Chen,Ming Jin,Luqiang Xu. Approach to Fixing Installation of E/UHV Grading-Rings with Hold-Hoops in Extreme Environments[J]. Journal of Electrical Engineering, 2016, 11(9): 35-43.

Figures/Tables 14

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宽度/mm	厚度/mm
宽度/mm	2	3	5	8	10
10	2.18	2.34	2.50	2.99	3.49
20	2.14	2.19	2.34	2.75	3.02
30	2.12	2.15	2.20	2.60	2.84
40	2.09	2.13	2.16	2.47	2.75
50	2.08	2.10	2.14	2.44	2.65
60	2.09	2.10	2.14	2.41	2.58
70	2.08	2.10	2.13	2.42	2.57

绝缘介质厚度/mm	介电常数εr
绝缘介质厚度/mm	2	3	5	8
0	3.51	3.51	3.51	3.51
2	3.47	3.47	3.48	3.48
5	3.40	3.42	3.42	3.43
8	3.34	3.36	3.38	3.39
10	3.30	3.35	3.35	3.37
12	3.26	3.30	3.30	3.34
15	3.21	3.25	3.29	3.30
18	3.16	3.21	3.25	3.26
20	3.12	3.18	3.22	3.25
25	3.04	3.11	3.17	3.18
30	2.99	3.08	3.11	3.15