In recent years

with the increasing severity of the greenhouse effect and more and more strict requirement of relevant environmental protection standards

people’s environmental protection awareness is constantly improving.The search of alternative gas to SF

6

for the application in gas insulated switchgear as insulation and interruption medium has become an important research content.In this paper

the load switch with adoption of three int

erruption modes（magnetic blow

metal deionized gate and puffer type）is introduced.The C

4

F

7

N gas mixture is used to perform the experimental study of gas interrupting performance in accordance with the requirement of active load interrupting test in GB（China National Standard）/T 3804—2017 standard.It is shown by the experimental result that the interrupting performance of puffer type load switch is the best among the 3 kinds of arc interrupting modes

which can interrupt/make successfully the 12 kV 650 A active load current for 10 times;Filling of C

4

F

7

N gas mixture to the metal deionized gate load switch can interrupt successfully 12 kV 240 A active load current;while of filling C

4

F

7

N gas mixture to the magnetic blow load switch failed in interrupting 12 kV 586A active load current and there is no obvious interruption sign during the whole interruption period.It is concluded through the interruption experimental result that increasing the mixing ratio of C

4

F

7

N can improve the interruption performance of the gas mixture.