C₄F₇N has excellent insulation performance. By mixing with CO₂, it is the highest potential alternative gas to the most greenhouse effect gas insulating medium SF₆, which is widely used in gas insulated high voltage electrical equipment. It is necessary to explore its insulation stability under different electrical fields before application. In this paper, the influence of electric field on C₄F₇N/CO₂ mixture with different gas pressures and mixing ratios is tested, analyzed and compared with SF₆ by experiment and calculation. It was found that the electric field sensitivity of C₄F₇N/CO₂ gas mixture is much higher than that of SF₆ and CO₂, where it is easy for partial discharge to emerge under non-uniform electric field. The insulation performance of C₄F₇N/CO₂ gas mixture is extremely susceptible to the internal electric field of electrical equipment, and optimization of the equipment internal structure to avoid uneven electric fields is needed.

C ₄ F ₇ N具有优异的绝缘性能。通过与CO ₂混合，它是最具温室效应的气体绝缘介质SF ₆的最高潜力替代气体，该气体已广泛用于气体绝缘高压电气设备中。在使用前，有必要探索其在不同电场下的绝缘稳定性。通过实验和计算，研究了电场对不同气压和混合比下C ₄ F ₇ N / CO ₂混合物的影响，并与SF ₆进行了比较。发现C ₄ F _7的电场敏感性N / CO ₂气体混合物远高于SF ₆和CO ₂混合物，在不均匀电场下很容易出现局部放电。C ₄ F ₇ N / CO ₂气体混合物的绝缘性能极易受到电气设备内部电场的影响，因此需要优化设备内部结构以避免不均匀的电场。