The state of the art research on environmentally friendly medium in three types of electrical equipment are summarized including medium-voltage switchgear

high-voltage switchgear and GIL. The paper introduces SF

6

gas mixtures that are used widespread and regarded as new environmental media with high substitution potential.Based on this

future development directions in environmentally friendly electrical equipment are analyzed.Results show that using SF

6

gas mixtures is

an effective method to reduce dosage of SF

6

in the near future.Relevant products have been developed

such as switch cabinet

circuit breaker and GIL. However

the voltage ratings of these products are not high enough to satisfy the requirements of high-capacity

ultra high-voltage girds.In the long term

fluoride gases like CF3 I

c-C

4

F

8

and CnF

2

nO have great application potential. But they have defects like high price and high liquefying temperature. So these gases need to be mixed with the gas that has low price and low liquefying temperature

such as CO

2

and N

2

. However

the problems of best mixing ratio and synergy relationship need to be further studied.