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access icon openaccess Research on optimisation of minimum air clearance of 1000 kV UHV AC substation

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 29/08/2018, Accepted 11/10/2018, Revised 26/09/2018, Published 26/10/2018

Based on air clearance discharge characteristic curve and insulation coordination method, it is pointed out that the minimum air clearance of 1000 kV ultra-high voltage (UHV) AC substation can be further optimised. On the basis of analysis of the merits and demerits of the two insulation coordination methods for air clearances of UHV substation stated in the national standard GB/Z 24842–2009, it is concluded that using statistical method for insulation coordination is more reasonable and feasible. The minimum air clearance of UHV substation is optimised with the statistical method based on 1000 μs switching impulse characteristic test results. According to the study results, the phase-to-earth air clearance A1′ can be 1 m less than that specified in standard, the air clearance between conductors 0.5 m less than that specified in standard, and the phase-to-phase air clearance of grading ring and tubular bus 0.6 and 1.8 m, respectively, less than that specified in standard.

Inspec keywords: air gaps; substations; insulation co-ordination

Other keywords: size 1.0 m; UHV AC substation; size 0.6 m; minimum air clearance; insulation coordination method; air clearance discharge characteristic curve; phase-to-phase air clearance; size 1.8 m; tubular bus; grading ring; UHV substation; voltage 1000.0 kV; national standard GB/Z 24842–2009; 1000 μs switching impulse characteristic test results; size 0.5 m; phase-to-earth air clearance; time 1000.0 mus; statistical method

Subjects: Substations; Power system protection

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