This paper discusses the present situation and tendency of the development of 252 kV GIS at home andabroad

introduces the rated parameters of the newly developed"252 kV-4 000 A-50 kA（3 s）-50 Hz"of a new gen-eration of compact 252 kV GIS design concept

key technology

structure features and type tests Adhering to the"high reliability

miniaturization

low cost"design concept

circuit breaker

can adopt the arcing chamber structurewith spring operating mechanism;Generalized design disconnetor/earthing switch

and the main bus-bar chamberindependence;Main bus-bar three-phase upper layout box;Current transformer integral pouring shape

inner/outertype two kinds of specifications;Integrated design of operation mechanism of disconnetor/earthing switch

the insti-tutions in the implementation of interval electric interlock;The integration between transportation

installation anddebugging. This product has independent intellectual property rights

has completed a full set of type test andthrough the national new product technical appraisement

and has been successfully applied to substation project.