Research of Gas Insulated Substation Switching Arc Model in the Simulation of Very Fast Transient Over-Voltage

Abstract

Abstract:

The very fast transient over-voltage (VFTO) in gas insulated substation (GIS) seriously affect the safe operation of the related equipment and the designing of insulating strength. So in the simulation calculation, accurate VFTO waveform under the reasonable arc model is particularly important. In this paper, virtual inductance arc model is put forward, combining with some 1 000kV GIS substation and comparing with other arc model, and detailed VFTO research of internal key equipment of GIS is made, and the influence of simulation step on VFTO is made. Result shows that virtual inductance arc model is continued of arc resistance model considering arc inductance characteristic, and it takes into account the inductance characteristics of arc compared with time-varying resistance model and the fixed value resistance model of the arc. Dynamic inductance is difficult to set up and affect the system stability in arc resistance model considering arc inductance characteristic, but virtual inductance arc model can solve the problem, so virtual inductance arc model is suitable for use when considering inductance characteristic of arc in the study of VFTO.

Key words: Gas insulated substation, very fast transient over-voltage, arc model, virtual inductance, simulation step

CLC Number:

TM564.1

Liu Dedong,He Renwang,Huang Kan,Zhan Jiwen. Research of Gas Insulated Substation Switching Arc Model in the Simulation of Very Fast Transient Over-Voltage[J]. Journal of Electrical Engineering, 2015, 10(6): 88-93.

Figures/Tables 9

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节点位置	VFTO幅值(pu)
节点位置	定值电阻模型	时变电阻模型	虚拟电感模型
变压器	1.069 8	1.149 7	1.150 2
变压器QS	2.085 1	2.034 5	1.983 4
操作QS	1.675 3	1.708 8	1.708 8
母线端部	2.423 1	2.639 0	2.519 3

步长/ns	节点位置
步长/ns	变压器	操作QS	母线端部
0.5	1.152	1.769	2.642
1	1.150	1.709	2.519
1.5	1.146	1.699	2.496
2.0	1.141	1.724	2.364
2.5	1.135	1.750	2.343