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DL 428-1991 DL 428-1991_English: PDF (DL428-1991) Standard ID Contents [version] USD STEP2 [PDF] delivered in Standard Title (Description) Related Standard Status PDF DL 428-1991 English 759 Add to Cart 5 days Electric power system automatic under-frequency load-shedding Technical stipulation DL 428-1991 Obsolete DL 428-1991 BASIC DATA Standard ID DL 428-1991 (DL428-1991) Description (Translated English) Electric power system automatic under-frequency load-shedding Technical stipulation Sector / Industry Electricity & Power Industry Standard Classification of Chinese Standard F20 Word Count Estimation 19,129 Date of Issue 1991/10/30 Date of Implementation 1992/4/1 Regulation (derived from) State Energy Bureau Notice 2011 No. 1