Investigation of the Discharge Decomposition Characteristics of HFO-1336mzz(E) Mixture as a Potential Alternative for SF6

HFO-1336mzz(E) has been seen as a potential SF6 substitute due to its excellent environmental friendliness and electrical property. However, the decomposition characteristics of HFO-1336mzz(E) under discharge are unclear at present. Therefore, the AC breakdown test on 0.1 MPa 30% HFO-1336mzz(E)/70% air mixture was carried out and the decomposition compounds of mixed gas after multiple breakdowns were detected by using gas chromatography-mass spectrometry (GC-MS). The test results show that the main decomposition compounds mainly include CF
4
, C
2
F
6
O
3
, C
2
F
4
, CHF3, C
3
F
8
, CF
3
CN, C
2
HF
5
, C
4
F
6
, C
3
HF
3
, and C
5
F
8
, etc. Physic-chemistry properties analysis indicated that CF3CN is a highly toxic gas, which might be a potential threat to the engineering personnel. Therefore, sufficient attention should be triggered when the gas is detected in the operation and maintenance.