振荡雷电冲击电压下气体绝缘组合电器中极不均匀场击穿特性研究

doi:10.19595/j.cnki.1000-6753.tces.190605

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Abstract Gas insulated switchgear (GIS) is the key equipment of power system. Impulse voltage withstand test is an important guarantee for its safe and reliable operation, in which both oscillating lightning impulse (OLI) and aperiodic lightning impulse (ALI) can be used in field. However, the similarities and differences between the two types of waveforms are still unclear. Thus, breakdown characteristics of insulation defects under OLI and ALI should be studied first. This paper sets up a protrusion defect on HV conductor to form non-uniform field distribution, and compares the breakdown characteristics under ALI and OLI. An impulse voltage generator was firstly established to generate 4 OLIs and 2 ALIs. A protrusion defect on HV conductor was set up in 363kV GIS chamber. Its length was 12mm and top radius of curvature was 0.4mm. Then 50% probability breakdown voltage (U_50%) and voltage-time (V-t) characteristics were experimentally studied. The results show that the U_50% difference between OLI and ALI is small. They are equivalent considering the detection for protrusion defect. With the increase of wavefront, U_50% decreases first and then increases. It is the lowest at 3μs, 1.5% lower than that at 1.2μs, and about 10% higher at 13μs. Breakdowns under OLI occur around each waveform peak, and V-t plots are dispersed. V-t plots under ALI always occur around the waveform peak continuously. Their V-t characteristics tend to coincide when wavefront exceeds 3μs. The results deepen the understanding of discharge phenomenon of non-uniform field in SF₆ under OLI, and also provide support for the scientific selection of waveform parameters in field impulse voltage withstand test of GIS.

Key words： Gas insulated switchgear (GIS) oscillating lightning impulse (OLI) non-uniform field 50% probability breakdown voltage voltage-time characteristics equivalence

Received: 20 May 2019

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	Zhang Liang
	He Cong
	Li Junhao
	Li Yuan

Cite this article:

Zhang Liang,He Cong,Li Junhao等. Breakdown Characteristics Study of Non-Uniform Field in Gas Insulated Switchgear under Oscillating Lightning Impulses[J]. Transactions of China Electrotechnical Society, 2020, 35(12): 2672-2680.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.190605 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I12/2672

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