Influence of 500 kV AC Lines on Safety Protection of Live Working Personnel in Parallel ±800 kV DC Lines

doi:10.11930/j.issn.1004-9649.202007015

Abstract

Abstract: In order to ensure the reliable operation of AC 500 kV and DC ±800 kV parallel transmission lines without power failure, the three-dimensional finite element model and electromagnetic transient model are used to study the safety protection of EHVAC and UHVDC transmission lines live working in hybrid lines. The safety protection is analyzed through the three aspects of body surface electric field, transfer current and transient energy. The results show that the worker's body surface electric field changes with the change of the phase of the AC line. The distance between the worker and the UHVDC transmission line is closer, the effect of the AC transmission line on the surface electric field is more obvious. Compared with the independent UHVDC transmission line, the worker's body surface electric field and transfer current amplitude in the mixed line have increased significantly, the transient energy value relatively has a small increase. In the hybrid line, it is recommended that the worker’s potential transfer work should be proceeded at a distance between 0.4 m to 0.5 m from the conductor with suitable screen clothes.

Key words: EHVAC and UHVDC parallel transmission line, live working, body surface electric field, transfer current, transient energy

MA Aiqing, WANG Jie, BI Yongxiang. Influence of 500 kV AC Lines on Safety Protection of Live Working Personnel in Parallel ±800 kV DC Lines[J]. Electric Power, 2022, 55(6): 128-136.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202007015

https://www.electricpower.com.cn/EN/Y2022/V55/I6/128

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