Study of partial discharge characteristics in HFO-1234ze(E)/N2 mixtures

HFO-1234 ze(E)(trans-1,3,3,3-tetrafluoropropene, chemical formula: CHF) is an extremely environmentally friendly SFalternative gas with high electrical strength. In this paper, the partial discharge(PD) characteristics of HFO-1234 ze(E)/Nmixtures were studied using the gas insulation test platform. The PD inception voltage of insulating gas under positive and negative half cycles of power frequency was tested. Using SF/Nmixtures as a control group, the effects of electrode spacing, mixing ratio and pressure on the insulation performance of HFO-1234 ze(E)/Nmixtures were explored. The test results show that the PD inception voltage of the negative half-cycle of pure HFO-1234 ze(E) under short electrode spacing can reach 0.96–1.04 times of pure SFunder different pressures; the PD inception voltage of40%HFO-1234 ze(E)/60%Nmixtures at 0.3 MPa is 0.67–0.89 times that of SF/Nmixtures under the same conditions, which has great application prospect.