Partial Discharge Induced Decomposition and By-products Properties of Eco-friendly Insulating Gas HFO-1234ze(E)
IEEE Transactions on Dielectrics and Electrical Insulation(2023)
摘要
HFO-1234ze(E) is non-toxic, environmentally friendly and has good dielectric strength, which has potential to be used in gas-insulated equipment. In this paper, the partial discharge characteristics of HFO-1234ze(E) are further studied. The dipole moment, polarizability and ionization energy of HFO-1234ze(E) under different electric fields are obtained by theoretical calculation to study the effect of external electric field on stability of molecular structure. The specific decomposition characteristics of HFO-1234ze(E) under long-term partial discharge are also studied by experiments. The results show that the dipole moment and polarizability of HFO-1234ze(E) are significantly higher than those of SF
6
, but the ionization energy is slightly lower than that of SF
6
. With the increase of the external electric field, the stability of molecular structure decreases, and the stability of HFO-1234ze(E) decreases more obviously. Under long-term partial discharge, HFO-1234ze(E) may decompose to produce CF
4
, C
2
F
6
, CHF
3
, C
2
F
4
, cis-C
3
H
2
F
4
, etc., and the contents increase with the time. Quantitative analysis of decomposition products shows that the contents of CF
4
, C
2
F
6
and CHF
3
are less than 20 μL/L. The breakdown voltage of HFO-1234ze(E) does not change significantly after long-term partial discharge, mainly due to the high relative dielectric strength of the decomposition products C
2
F
6
and cis-C
3
H
2
F
4
.
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关键词
HFO-1234ze(E),insulating properties,partial discharge,decomposition products
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