Gas Insulated Substation By Ms Naidu Pdf Download

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Abstract:Gas insulated substations (GISs) are broadly used for transmission and distribution in electric power networks. Very fast transient overvoltage (VFTO) caused by SF6 discharge during switching operations in a GIS may threaten the insulation of electrical equipment.

The world’s energy structure is undergoing a great change as the transition is taking place from traditional energy structures to a more renewable source-based structure. The renewable energy market in the US is expected to continue its growth in 2014, with more than 3% of all energy supplied through renewable sources. In New York State, for example, this rise will be 10%, making New York one of the biggest renewable energy markets in the world by 2020. The transition to a more renewable source-based structure has resulted in the need for new generation, transmission, distribution and storage systems that are more reliable, flexible and resilient. This, in turn, requires new infrastructure investments. Gas insulated substations (GISs) play a central role in the distribution systems in the process of power system strengthening and renewable integration. The GIS is one of the fundamental units in the high-voltage networks. In order to transform the traditional operation mode of GISs and the new operation mode of GISs in a renewable energy system, new technology and new approaches to the design of GISs are required. In this study, we have aimed to address the issue of fast transient overvoltage (VFTO) caused by SF6 discharge during switching operations in a GIS. This critical issue in GISs has been a subject of research since the 1980s. In the study, we have introduced a novel VFTO suppression method with great prospects in engineering, called the spiral tube damping busbar. The suppressing mechanism of the new method is analyzed. The structure and the design characteristics of the damping busbar are introduced as well. Moreover, a calculation method for the self-inductance of the damping busbar at high frequency is presented. According to the structural characteristics of the damping busbar, the inductance effect on suppressing VFTO is analyzed. A further improvement in damping VFTO is investigated by designing a spiral litz coil connected in series with the busbar, which increases the damping effect. The simulation results show that the improved damping busbar has a significant suppressing effect on the amplitude and the frequency of VFTO.

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