Zhuo Ran, Fu Mingli, Wang Dibo, Luo Yan, Wang Guoli, Jia Lei
Electric Power Research Institute, China Southern Power Grid, Guangzhou 510623, China.
National Engineering Research Center of UHV Technology and New Electrical Equipment Fundamentals, Guangzhou 510623, China.
ACS Omega. 2023 Jun 20;8(26):23457-23464. doi: 10.1021/acsomega.3c00345. eCollection 2023 Jul 4.
With the gradual improvement of the requirements for the safe and stable operation of gas-insulated equipment (GIE), the eco-friendly insulating gas CFN-CO-O has become the best choice to replace SF and apply it to various medium-voltage (MV) and high-voltage (HV) GIE. At present, the generation characteristics of solid decomposition products of the CFN-CO-O gas mixture under partial discharge (PD) fault need to be studied. In this paper, a 96 h PD decomposition test was carried out by simulating metal protrusion defects in GIE with needle-plate electrodes to study the generation characteristics of CFN-CO-O gas mixture solid decomposition products under PD fault and their compatibility with metal conductors. It was found that obvious ring-shaped solid precipitates appeared in the central area of the surface of the plate electrode under the action of long-term PD, mainly including metal oxides (CuO), silicates (CuSiO), fluorides (CuF, CF), carbon oxides (CO, CO), and nitrogen oxides (NO, NO). The addition of 4% O has little effect on the element composition and valence state of PD solid precipitates, but it can reduce their yield to a certain extent. The corrosion effect of O in the gas mixture on metal conductors is weaker than that of CFN.
随着对气体绝缘设备（GIE）安全稳定运行要求的逐步提高，环保型绝缘气体CFN-CO-O已成为替代SF并应用于各种中压（MV）和高压（HV）GIE的最佳选择。目前，需要研究CFN-CO-O气体混合物在局部放电（PD）故障下固体分解产物的生成特性。本文通过用针-板电极模拟GIE中的金属突出缺陷进行了96小时的PD分解试验，以研究CFN-CO-O气体混合物在PD故障下固体分解产物的生成特性及其与金属导体的相容性。研究发现，在长期局部放电作用下，板电极表面中心区域出现明显的环状固体沉淀物，主要包括金属氧化物（CuO）、硅酸盐（CuSiO）、氟化物（CuF、CF）、碳氧化物（CO、CO）和氮氧化物（NO、NO）。添加4%的O对局部放电固体沉淀物的元素组成和价态影响不大，但能在一定程度上降低其产率。气体混合物中的O对金属导体的腐蚀作用比CFN弱。
