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DC transmission has a lot of merits compared with AC transmission. For example, the cost of the construction and the equipment is less than that of the AC transmission system. Besides, more energy can be transmitted in DC transmission lines. Recently, multi-terminal transmission lines are required urgently. For that purpose, the reliable DC transmission circuit breakers must be developed. As we all...
The Objective of this paper is to explore the possible decomposition pathways and products of Perfluoronitrile C4F7N by density functional theory (DFT). First, the molecular structure, vibrational frequency and energy information of C4F7N and other major molecules are calculated by Materials Studio software. These results of some species(CF3, CF2, CF, C2F4, C2F5 and so on) are in a good agreement...
There are few investigations of DC self-excited oscillation interruption under transverse magnetic field (TMF). The objective of this paper is to understand the effects of transverse magnetic field on DC interruption characteristics of CO2 and SF6 gases based on the self-excited oscillation principle. The DC self-excited oscillation interrupting characteristics of CO2 and SF6 at 0.5 Mpa absolute atmospheric...
Liquid Nitrogen Insulated metal enclosed Switchgear (LNIS) is an alternative to the conventionally used Gas Insulated Switchgear (GIS), so all the components of GIS must be considered for LNIS as well. The principle research is however required to examine the behavior of arc plasma in Liquid Nitrogen (LN2). Until now, no one has ever investigated the arcing time in LN2. The objective of this work...
Gas-insulated metal-enclosed switchgears (GISs) are widely applied in the electrical power industry to transmit and distribute electrical energy because of the attractive dielectric and interrupting properties of sulfur hexafluoride (SF6). However, the use of SF6 may have a negative effect on the atmosphere and may contribute to global warming. This paper presents an eco-friendly switchgear: liquid-nitrogen-insulated...
Because of great harmfulness of greenhouse effect, SF6 gas has to be limited, and it is necessary to develop high voltage vacuum circuit breakers to replace SF6 circuit breakers. Current chop is a well-known phenomenon for vacuum interrupters and results in high overvoltage. The chopping current depends not only on material parameters and gap parameters, but also on the parameters of the electrical...
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