Ablation-assisted current interruption in medium voltage switchgear – Development and prospect

Dielectric Properties of Gases Suitable for Secondary Medium Voltage Switchgear

SF6 is the dominating technology for gas insulated switchgear due to its excellent dielectric, thermal and arc quenching properties. Unfortunately, SF6 suffers from a very high global warming potential (GWP). Even though medium voltage switchgear is sealed for life with less than 0.1% emissions per year, the EU has specifically targeted SF6 for replacement in medium voltage switchgear for secon...

Development of Medium-voltage Switchgear for Reducing Environmental Impact and Space-saving

Kenji Tsuchiya Koichi Nagano Ayumu Morita Tetsuya Hirao OVERVIEW: To make medium-voltage switchgear (52 kV or less) smaller and more robust, there has been a shift away from AISs and toward GISs that use SF6 gas . However, the high global warming coefficient of SF6 gas means it was designated as a greenhouse gas by the Kyoto Protocol (Kyoto Protocol to the United Nations Framework Convention on...

Partial Discharge Pattern Recognition of Medium-Voltage Switchgear Based on Association Rules Mining

In the paper, a new partial discharge pattern recognition approach based on association rules mining is developed. Some statistical parameters are extracted from the sampled transient earth voltage data and classic Apriori algorithm is employed to mine the association rules between those parameters and the corresponding fault types. Moreover, using other experimental data obtained in the labora...

Ultra-high-voltage switchgear to power China

Multi-megampere Current Interruption

Two approaches for using explosives to interrupt current flowing in solid conductors are described. One concept uses explosives to extrude the switch conductor into thin regions that fuse due to current in the switch. A preliminary scaling law is presented. The second approach employs dieiectric jets to sever current carrying conductors. A feasibility experiment and an improved design are descr...