To support the safe operation of the novel three-element mixed insulation oil (TEMO) transformer, gas generation behaviors of the TEMO oil–paper insulation system under overheating faults and discharge faults were investigated. Results show that that the content of H₂ and C₂H₆ generated by TEMO–paper insulation system is much higher than that in conventional mineral oil (MO)–paper insulation system under different overheating temperatures. Under partial discharge fault, the content of H₂ dissolved in oil changes distinctly, while the content of C₂H₂ also increases with the discharge time. Under surface flashover breakdown, AC breakdown and lightning impulse breakdown fault, the content of H₂ and C₂H₂ changes greatly compared to other gases, while the concentration of total hydrocarbon gases in TEMO–paper insulation system is smaller than that in MO–paper insulating system after the same breakdown times. The diagnosis model of overheating and discharge faults for the TEMO–paper insulation system was proposed based on the oil dissolved gas analysis, while H₂, C₂H₂ and C₂H₄ were chosen as the characteristic gases and the boundary settings were determined. The verified result for the low-temperature overheating, lightning impulse and surface flashover fault for the TEMO–paper insulation system presents that the new diagnosis model is effective.

为了支持新型三元混合绝缘油（TEMO）变压器的安全运行，研究了TEMO油纸绝缘系统在过热故障和放电故障下的产气行为。结果表明，在不同的过热温度下，TEMO –纸绝缘系统产生的H ₂和C ₂ H ₆含量远高于常规矿物油（MO）–纸绝缘系统。在局部放电故障下，油中溶解的H ₂含量变化明显，而C ₂ H ₂含量随着放电时间的增加。在表面闪络击穿，交流击穿和雷电冲击击穿故障下，与其他气体相比，H ₂和C ₂ H ₂的含量变化很大，而TEMO-纸绝缘系统中的总烃气体浓度小于MO-纸绝缘系统经过相同的击穿时间后。基于油溶气分析，提出了TEMO-纸绝缘系统过热和排放故障的诊断模型，而H ₂，C ₂ H ₂和C ₂ H ₄选择作为特征气体并确定边界设置。TEMO-纸绝缘系统的低温过热，雷电冲击和表面闪络故障的验证结果表明，新的诊断模型是有效的。