Partial Discharge Measurements in a High Voltage Gas Insulated Transmission Line Insulated with CO 2

Phillip Widger, Daniel Carr, Alistair Reid, Meirion Hills, Chris Stone and A. (Manu) Haddad
Additional contact information
Phillip Widger: School of Engineering, Cardiff University, The Parade, Cardiff CF24 3AA, UK
Daniel Carr: School of Engineering, Cardiff University, The Parade, Cardiff CF24 3AA, UK
Alistair Reid: School of Engineering, Cardiff University, The Parade, Cardiff CF24 3AA, UK
Meirion Hills: School of Engineering, Cardiff University, The Parade, Cardiff CF24 3AA, UK
Chris Stone: School of Engineering, Cardiff University, The Parade, Cardiff CF24 3AA, UK
A. (Manu) Haddad: School of Engineering, Cardiff University, The Parade, Cardiff CF24 3AA, UK

Energies, 2020, vol. 13, issue 11, 1-11

Abstract: This paper uses practical experimentation to analyse the effect of replacing SF 6 with pure CO 2 in conventional gas insulated transmission line sections by studying partial discharge measurements taken with applied voltages up to 242 kV (rms). The results can also help in understanding the properties of new alternative gas mixtures which can be utilised with a ratio of up to and over 95% CO 2 . The experiments undertaken involved filling a gas insulated line demonstrator with 3 bars of CO 2 and applying voltages up to 242 kV in both clean conditions and particle-contaminated enclosure conditions. The results demonstrate that CO 2 can be used to insulate gas equipment without breakdown at high voltage, however, a higher gas-filling pressure may be needed to reduce the partial discharge found in the tests presented in this paper. Another aspect of the work showed that partial discharge (PD) measurements from internal ultra-high frequency (UHF) sensors compared with a direct measurement from a capacitive divider both clearly showed the effect of contaminating particles in CO 2 . However, the PD divider measurements also showed considerable external PD on the outside of the gas compartment, leading to the conclusion that UHF sensors are still regarded as having the highest sensitivity and noise immunity for gas insulated switchgear (GIS) or gas insulated transmission line (GIL) systems including when the equipment is insulated with CO 2 .

Keywords: gas insulated transmission lines (GILs); partial discharge (PD); sulphur hexafluoride (SF 6 ), carbon dioxide (CO 2 ); ultra high frequency (UHF) sensors (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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