1 intro think Grid institution in the transmission and distribution items procurement and bidding method for that centralized supervision and centralized operation of significant reforms. 2005 363kV and above 1550kV and items procurement and bidding concentrated company headquarters, in turn 252kV items in previous due 2006 also concentrated on Beijing bidding for 40.5 ~ 126kV items within your online community of provincial set concentrated bidding. think Grid institution in 2006 also ready and issued “110 ~ 500kV Transformer substation common Specification General. ”

In the bidding so that you just can very much better carry out properly the common standard, reasonably determine the items and specialized specifications associated to this write-up converse concerning the high-voltage AC Isolating change And earthing switches used in several issues for electric powered energy engineering design and design and items choice of sector-related qualified references.