NDLI: Study on the lightning strike discharge characteristics of switchgear air gap at low air pressure condition

Content Provider	IET Digital Library
Author	Zhang, Zhijin Wei, Donghong Zhang, Dongdong Zhu, Junyu Li, Chen
Abstract	The usage of medium-voltage switchgear is more and more common in high altitude areas. Few relative standards about the selection of switchgear air gap in low air pressure conditions are currently available for referring. In this study, four different types of switchgear air gaps, as well as a typical rod-plane gap, are taken as the samples, and their positive and negative lightning strike discharge characteristics under low air pressure are tested in the artificial climate chamber. The effects of the electrode structure, polarity, air pressure, humidity, and gap distance on the discharge performances are analysed as well. Research results indicate that the four switchgear air gaps and typical rod-plane gap differs greatly in lightning impulse discharge performances and polarity effects. In low air pressure conditions, the lightning impulse breakdown voltage of either positive or negative polarity can be corrected by U 50 = U 50,0 × (P/P 0) n . The discharge voltage under positive lightning impulse is more easily affected by air pressure than that under negative lightning impulse. Atmosphere humidity will cause dispersiveness of air-gap lightning impulse discharge voltage, which performs to be non-linear with a gap distance lower under 400 mm. Research results are referable for the design, selection and installation of medium-voltage switchgear in high altitude areas.
Starting Page	2148
Ending Page	2154
Page Count	7
ISSN	17518687
Volume Number	12
e-ISSN	17518695
Issue Number	Issue 9, May (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/12/9
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2017.1362
Journal	IET Generation, Transmission & Distribution
Publisher Date	2018-02-07
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Air Gap Air-gap Lightning Impulse Discharge Voltage Artificial Climate Chamber Atmosphere Humidity Dielectric Material And Property Discharges (electric) Electrode Electrode Structure Gas Discharges Lightning Lightning Impulse Breakdown Voltage Lightning Impulse Discharge Performance Medium-voltage Switchgear Air Gap Negative Lightning Strike Discharge Characteristic Polarity Effect Rod-plane Gap Switch
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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