摘要
近年来环保绝缘介质C_(4)F_(7)N/CO_(2)混合气体凭借优良的电气性能和环保优势得到了广泛关注,具有替代SF_(6)气体的潜能。针对C_(4)F_(7)N/CO_(2)混合气体在实际运行中可能遇到的故障工况,进行了局部放电、局部过热和火花放电下的分解实验,利用气相色谱质谱联用技术(GC-MS)对不同工况下分解产物进行了定性分析,提出了不同故障工况下特征分解产物。实验结果表明:3种工况下的分解产物主要由饱和氟代烃(CF_(4)、C_(2)F_(6)、C_(3)F_(8)、C_(4)F_(10))、不饱和氟代烃(C_(2)F_(4)、C_(3)F_(6)、C_(4)F_(8)、i-C_(4)F_(8))以及含氮化合物(C_(2)F_(3)N、C_(3)F_(5)N、C_(2)N_(2)、HCN)组成。根据不同工况下分解产物的差异,提出局部放电下可将HCN和峰面积(C_(3)F_(8))/离子峰面积(C_(2)F_(3)N)>1作为识别的特征分解产物;局部过热以C_(4)F_(8)及其同分异构体i-C_(4)F_(8)作为特征分解产物;以CF4和离子峰面积(C_(3)F_(8))/离子峰面积(C_(2)F_(3)N)<1同时作为火花放电的特征分解产物;工频击穿以C_(4)F_(6)和C_(3)F_(3)N作为特征分解产物。
In recent years,the environmentally friendly insulating medium C_(4)F_(7)N/CO_(2) mixed gas has attracted wide attention due to its excellent electrical performance and environmental protection advantages,which has the potential to replace SF_(6) gas.In this paper,the decomposition experiments of C_(4)F_(7)N/CO_(2) mixture under partial discharge,partial overheating and spark discharge were carried out according to the fault conditions that may be encountered in actual operation.The decomposition products under different working conditions were qualitatively analyzed by gas chromatography-mass spectrometry(GC-MS),and the characteristic decomposition products under different working conditions were proposed.The results show that the decomposition products under three different conditions are mainly composed of saturated fluorocarbons(CF_(4),C_(2)F_(6),C_(3)F_(8),C_(4)F_(10)),unsaturated fluorocarbons(C_(2)F_(4),C_(3)F_(6),C_(4)F_(8),i-C_(4)F_(8))and nitrogenous compounds(C_(2)F_(3)N,C_(3)F_(5)N,C_(2)N_(2),HCN).According to the difference of decomposition products under different working conditions,HCN and peak area(C_(3)F_(8))/peak area(C_(2)F_(3)N)>1 can be used as the characteristic decomposition products under partial discharge condition.C_(4)F_(8) and its isomer i-C_(4)F_(8) are used as characteristic decomposition products under partial overheating condition.Under the condition of spark discharge,CF_(4) and peak area(C_(3)F_(8))/peak area(C_(2)F_(3)N)<1 are taken as the characteristic decomposition products of spark discharge.Characteristic decomposition products of power frequency breakdown are C_(4)F_(6) and C_(3)F_(3)N.
作者
杨韬
张博雅
李兴文
李晨威
YANG Tao;ZHANG Boya;LI Xingwen;LI Chenwei(State Key Laboratory of Electrical Insulation and Power Equipment,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2021年第12期4216-4228,共13页
High Voltage Engineering
基金
国家自然科学基金(51825702,51907154)。
