selection and the protection of transformer installed、 Due to the fact that main electrical scheme is the main part of substation, this thesis synthetically compares several main electrical schemes from technical and economic aspects and picks up one preferable scheme、 According to the chosen scheme, detailed design and instruction are carried out about the electric apparatus selection, relay protection, and so forth、РThis thesis consist of two parts, the first part is design specification, which introduces the selection electric apparatus’ type, technical parameter, etc; the second part is design calculation, which conducts short circuit current calculation, equipment lectotype, and verification on the selection short dot、РKey Words: substation, main electrical scheme, electric apparatus
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