这次修订的主要内容是向国际电工委员会（IEC）标准靠拢，在配电线路的保护中，为了防止人身间接电击、电气线路损坏和电气火灾，全面采用了国际电工标准,这是配网设计标准2011版-The main contents of this amendment to the International Electrotechnical Commission (IEC) standard to move closer to the protection of distribution lines, in order to prevent physical indirect electrical shock, damage electrical wiring and electrical fires, full adoption of the International Electrotechnical Standards，This is the 2011 version of the standard distribution network design