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Add to basketpaperback. Condition: New. Pub Date :2007-03-01 Publisher: China Electric Power Press book is divided into seven chapters. the main contents include the basic knowledge of the secondary electrical diagrams. substation control systems. signal systems. synchronous system. DC System Power Supplies transformer secondary circuit and substation automation. Commonly used electrical old and new symbol table book with easy teaching use. Contents: Preface Chapter secondary electrical diagram of a basic knowledge of first electri.