This month’s Featured Technical Paper is from the Proceedings of the 2020 International Conference of Doble Clients. The paper is titled:115 kV Self-Contained-Fluid-Filled Cable Splice Rebuild Based on Dissolved Gas Analysis.
Dissolved Gas Analysis (DGA) was performed on 75 “normal joints” from a 115 kV Self Contained Fluid Filled Cable. One splice showed alarmingly high levels of several combustible and non combustible gasses. The splice was dissected, and significant electrical and thermal activity was observed during the dissection. The splice was rebuilt on the existing cable, which appeared undamaged and the cable was returned to service. The discharge and thermal related activity initiated at an improperly constructed shield gap in the splice. An in-service failure was averted by detecting the issue through DGA. This paper discusses the DGA and provides details of the splice dissection.
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