In recent years

HFO-1234ze(E) is considered to have great application potential in medium and low voltage equipment due to its good environmental protection characteristics and excellent insulation performance. At present

the test exploration on the gas is relatively less. Firstly

the liquefaction temperature of HFO-1234ze(E)/CO

2

gas mixture under different pressures is calculated in this paper. Then

the influence of gas pressure and the mixign ratio on the insulating performance of HFO-1234ze(E)/CO

2

gas mixture is studied respectively by using the gas insulation performance test platform and the optimal mxing ratio as well as gas pressure value in actual engineering application is discussed. After that

the gas chromatography-mass spectrometry (GC-MS) is used to perform qualitative analysis of the decomposed product and

at the same time

the decomposed product is simulated and calculated. The research results show that under different uniform field conditions

the insulation performance of HFO-1234ze(E)/CO

2

gas mixture increases with the increase of the mixing ratio and the breakdown voltage shows approximately linear increase. In case of not changing the mixing ratio

increase of gas pressure can significantly improve the insulation performance of HFO-1234ze(E)/CO

2

gas mixture and

at the same time

under the conditi

on of 0.3 MPa

the gas mixture containing 20%-25% HFO-1234ze(E) not only has a good insulation level

but also the influence due to uneven electric field is less and is applicable for practical engineering applications. The HFO-1234ze(E)/CO

2

gas mixture has a good self-recovery insulation performance. The decomposed products are mainly hydrofluorocarbons (HFC) and hydrocarbons (HC). The simulation results show that the decomposed products are relatively stable. The results of comprehensive experiments and simulation calculations show that HFO-1234ze(E)/CO

2

gas mixture has the potential to replace SF

6

gas and applicable for medium and low-voltage insulation equipment.