Abstract
Land shortage in metropolitan vicinities entails subsurface implementation of power transmission lines (PTLs) which demand structural flexibility, as well as substantial load bearing capability. Thus, development of a flexible gas insulated transmission line (FGIL) necessitates its strength degradation analysis, regarding the synergistic effect of aging and mechanical loadings. Moreover, correlation of conductor and enclosure dimensions of FGIL apropos field distribution, requires careful consideration regarding their dimensional specifications. In this research, a comprehensive electro-mechanical design is performed for the proposed flexible-thermoplastic-enclosure of a 132 kV FGIL by considering the synergistic impact of time and temperature-based aging, along with the effect of external and internal loadings, such as dead load, live load and internal gas pressure. Additionally, a recursive design algorithm for the proposed scheme regarding electro-mechanical aspects, along with aging perspectives is developed. Comparative analysis of proposed and conventional schemes regarding electro-mechanical and aging aspects revealed that the proposed enclosure exhibits the required structural strength, as well as flexibility for trenchless subsurface application of FGILs in metropolitan areas.
Highlights
Proliferating industrialization and urbanization has increased the load demand, which necessitates upgradation along with new installation of power transmission lines (PTLs), in order to ensure higher system reliability and stability [1,2,3,4]
References [34,35,36,37] suggest that flexible gas dampers insulated [20,25,31], line (FGIL)jointing is a potential candidate for the trench development and corrosion protection curtailment of complexities associated with metropolitan applications of conventional PTLs
Pressure rating of thermoplastic enclosure is directly related to its dimension ratio (DR) which depends upon the material characteristics like Tensile Strength (TS), density and its modulus
Summary
Proliferating industrialization and urbanization has increased the load demand, which necessitates upgradation along with new installation of power transmission lines (PTLs), in order to ensure higher system reliability and stability [1,2,3,4]. FGIL providesa following advantages contrast to the conventional rigid as GIL: Acceleration of structural flexibility; substantially reducedin bending radius and lay length, well as lesser dampers are not required; there is no need for corrosion protection; the incorporation of structural required land area at bends. Considering the concern of enclosure’s strength degradation regarding synergistic impact of aging and mechanical loadings, this research, a flexible-thermoplastic-enclosure with significantly. Considering the concern ofinenclosure’s strength degradation regarding synergistic impact of aging and mechanical loadings, in as this research,is a flexible-thermoplastic-enclosure significantly high structural strength, as well flexibility, proposed for FGIL. HDD, and will eliminate the requirement of trench development which will result in substantial cost saving
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