Optimal placement of underground cables to maximise total ampacity considering cable lifetime

Electro-Mechanical Design and Creep Analysis of Proposed Enclosure for Flexible Gas Insulated Line Regarding Subsurface Metropolitan Applications of High-Voltage Transmission Lines

“…Moreover, dielectric medium comprising of a mixture of N 2 and SF 6 gases in a ratio of 20:80 will also have a lesser BV, due to reduced SF 6 content in comparison to the pure SF 6 based dielectric medium. Thus, possible degradation in BV due to reduced SF 6 content in the dielectric mixture is determined through Equation (27), where m represents the degradation in BV due to reduced SF 6 content and n represents the percentage the SF 6 in the dielectric mixture [70].…”

“…Thus, design and operational magnitudes of electric field in the proposed PE 100 based FGIL needs careful consideration and are determined through Equation 28by considering BIL voltage and nominal operating voltage respectively [67,68]. Moreover, Equation 28is rearranged as Equation (29) in order to determine the critical electric field for proposed scheme by using Equation 23, Equation 26and Equation (27). In Equation 29, BV represents breakdown voltage, as evaluated using Equations (26) and Equation 27.…”

“…Literature describes that existing PTLs are comprised of underground cables (UGCs) [7,[13][14][15], overhead lines (OHLs) [2,11,16,17] and gas insulated lines (GILs) [18][19][20][21]. Researchers have described that implementation of UGCs and OHLs in urban vicinities experience hindrances like spatial proximity [9,22,23], right of way [1,2,24], electromagnetic compatibility (EMC) concerns [3,23,25,26], aesthetics [22,24], trench requirements [14,27], corrosion [1,28] and system failure due to prolonged fault clearance time [9]. In addition, the following problems with the metal enclosures of conventional GILs critically addition, the following problems with the metal enclosures of conventional GILs critically constrain their use in urban areas: Long lay lengths and bending radii [18,19,29], excessive rigidity [18,26,30], their needs for acceleration dampers [20,25,31], jointing complexities [18,20,29], trench development [12,29,…”

Techno‐economical lifetime assessment of power transformers rated over 50 MVA using artificial intelligence models

“…Also, the methodology for analysing the technical and economic aspects for some assets is presented in [7, 8]. The ageing of the cable insulation and the lifetime of the cable are studied in [9].…”