Realization of the Compact Outdoor Substation by Advanced Gas-insulated Transformers

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  • 新形ガス絶縁変圧器の適用によるコンパクト屋外変電所の実現
  • シンガタ ガス ゼツエン ヘンアツキ ノ テキヨウ ニ ヨル コンパクト オクガイ ヘンデンショ ノ ジツゲン

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Abstract

<p>SF6 gas-insulated transformers (GITs) with a large capacity of 300MVA-275kV have applied to underground substations because of their big advantage in safety. The conventional GIT is consist of three single-phase transformers because of a limitation of transportation and an on-load tap changer (OLTC) is divided into two tanked parts such as a diverter switch and a tap selector to minimize room height of underground substations.</p><p>Unlike oil-immersed transformers (OITs), layout of GIT is not affected by requirements from the view point of fire protection because of its inflammable and non-explosive feature. This excellent feature is expected to contribute to space reduction not only for underground substations but also for outdoor substations. Therefore, we have developed the world's first three-phase 300MVA-275kV GIT with a built-in OLTC for outdoor EHV substations. This new GITs successfully reduced 40% or more of space of an EHV outdoor substation consisted of three transformers as compared with a case of applying OITs.</p><p>In this paper, we discuss some specific examples of effort to develop the new GIT such as optimization of specifications applied for the new GIT, achievement of significantly advanced insulation and cooling design of GIT windings, and results of a full-scale test using a prototype of the new GIT.</p>

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