Manual Instantaneous Grounding Test of CSG Transmission Lines

Leishi XIAO; Ming LI; Yanhe HE; Zhen HUANG; Zheng WEI; Zhangquan RAO; Qian LI

doi:10.13648/j.cnki.issn1674-0629.2015.03.012

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South Power Sys Technol ›› 2015, Vol. 9 ›› Issue (3) : 63-67. DOI: 10.13648/j.cnki.issn1674-0629.2015.03.012

High Voltage and Insulation

Manual Instantaneous Grounding Test of CSG Transmission Lines

Leishi XIAO ¹ ,
Ming LI ² ,
Yanhe HE ¹ ,
Zhen HUANG ¹ ,
Zheng WEI ¹ ,
Zhangquan RAO ¹ ,
Qian LI ¹

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Abstract

Manual instantaneous grounding test of transmission lines is a key procedure in HVDC project commissioning. This paper describes the manual instantaneous grounding test method of transmission lines applied to multiple HVDC projects of CSG, and simulates the influence of grounding current and soil resistivity on regional step voltage using CDEGS software. Simulation results show that when the grounding current is 10 kA, the soil resistivity of the short circuit area is 1 500 Ω·m, and the grounding device of current divergence tower is typically radial, the maximum step voltage of the test field within 30 m horizontal distants away from the tower base will exceed the safe limit, then the safe distant should be improved to reduce the test risk.

Key words

China Southern Power Grid / transmission line / grounding short circuit

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Leishi XIAO , Ming LI , Yanhe HE , et al . Manual Instantaneous Grounding Test of CSG Transmission Lines[J]. Southern Power System Technology. 2015, 9(3): 63-67 https://doi.org/10.13648/j.cnki.issn1674-0629.2015.03.012

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