Research on the Characteristics of TEV when Disconnector Operating in UHV GIS

The ultra-high voltage system has the properties of high voltage grade, huge transmission capacity and rather sever electromagnetic transient problems. In order to investigate the transient characteristics of enclosure voltage when disconnector operating in ultra high voltage GIS,the calculation theory of transient over-voltage outer the GIS under ultra-high voltage was clarified based on a 1100 kV GIS in China. The transient enclosure voltages on each point of GIS were calculated using multi-condutor model, the spectrums of which were realised,too. In addition, the factors effected on TEV, which were disconnector operation types, operation phase, grounding types and so on, were analyzed. The transient characteristics of TEV and the general laws of factors affecting the TEV obtained by calculation and analysis may supply the theotical support and data reference for the construction and operation of UHV substation in the future.