EFFECTS OF ADDITIVES ON STRAY GASSING OF OIL-PAPER COMPOSITE UNDER THERMAL STRESS

Abstract

Abstract: In order to study the real gassing characteristics of transformers in operation, effects of base oil,antioxidant DBPC and metal deactivator Irgamet39 on stray gassing of oil-paper composite insulation at 120 ℃ were studied. The test results showed that stray gassing of oil-paper was largely influenced by additive types, oil oxidation, insulation pressboard thermal degradation, and insulation pressboard adsorption. Antioxidant DBPC could greatly reduce the content of hydrogen and hydrocarbon gas in oil-paper insulation system by inhibiting the aging of insulating oil. However, DBPC could also promote the aging of insulating paperboard to produce more CO and CO₂. The metal deactivator Irgamet39 produced a higher amount of hydrogen in the oil-paper insulation system, and showed a sharp downward trend, compared with the amount of hydrogen produced by pure oil, which was considered to be caused by the adsorption of metal deactivator on the insulation board. At the same time, Irgamet 39 could promote the pressboard aging leading to more CO and CO₂, while Irgamet39 made no obvious influence on hydrocarbon gas.

Key words: insulation oil, transformer oil, antioxidant, metal deactivator, gassing characteristics

References

[1]IEC 60599:2015.Mineral oil-filled electrical equipment in service - Guidance on the interpretation of dissolved and free gases analysis[S].2015-09-16.
[2]IEC60567:2011.Oil-Filled Electrical Equipment-Sampling of Gases and of oil for analysis of free and dissolved gases-Guidance[S], 2011-10-20.
[3]王会娟，马书杰，于会民，等.变压器油产气特性与其氧化安定性的关联性研究[J].绝缘材料,2016,49（1）:20-24.
Wang Huijuan, Ma Shujie, Yu Huimin, et al. Study on correlation between gassing characteristics and oxidation stability of transformer oil[J].Insulation materials,2016,49（1）:20-24.
[4] Lance R, Paul Griffin. Gassing Characteristics of Transformer Oil Under Thermal Stress[J]. NETA World,2005(3):1-4.
[5] Michel Duval, Lance Lewand, Donald Lamontagne. Dissolved Dissolved Gas Analysis in Transformer Oil-methods, Trending& Assessment[C]//IEEE/PES Transformers Committee Fall 2006 Meeting,Montreal,2006.
[6] Atansova I, Rehorek C, Hammer T. Gassing and Oxidation Behavior of Insulating Fluids Under Thermal Stress[C]//Cigre 2009 6th Southern Africa Regional Conference,Paris,2009.
[7] Edward Casserly, Jimmy M.Rasco. Stray gassing of refinery streams and transformer oil produced from them[C]//2014 IEEE International Conference on liquid Dielectrics, Slovenia,2014.
[8]Atanasova-H?hlein.Stray gassing cases of insulating liquids in HV equipment.[J]IEEE Tran. Dielectr. Electr. Insul.,2015,22(5)：2718–2722.
[9]IEC60296:2012.Fluids for electrotechnical applications – Unused mineral insulating oils for transformers and switchgear[S].2012.
[10]ASTM D7150-13.Standard Test Method for the Determination of Gassing Characteristics of Insulating Liquids Under Thermal Stress[S].
[11]J.Weesmaa, M.Sterner. Study about stray gas generation in transformer oil at different temperatures[C].2014 IEEE International Conference on Liquid Dielectrics,Bled,2014:1-8.
[12]Steve Eeckhoudt, Stijn Autru, Luc Lerat. Insulating oils: Impact of materials, oxygen content, additives, incubation time and temperature, and its relationship to oxidation stability[J].Dielectrics and electrical insulation.2017,33（6）:27-32.
[13]Fabio Scatiggio, Massimo Pompili, Ray Bartnikas. Effects of metal deactivator concentration upon the gassing characteristics of transformer oils[J].IEEE Transactions on dielectrics and electrical insulation,2011,18（3）:701-706.
[14]A.Lombard, J.Osborne. A study on the relationship between passivator and gas formation[C]// Eskom Doble Conf., South Africa, 2010.
[15]Huijuan Wang, Shujie Ma, Huimin Yu. Study on stray gassing of transformer oil with metal deactivator under condition of coincident electric field and temperature[C]. 2017 4th International Conference on electric power equipment-switching technology:965-969.
[16]陈启杰，魏冬云，晏永祥.电力变压器绝缘纸板绝缘寿命面临的挑战[J].湖南造纸，2015（1）：17-19.
Qijie Chen, Dongyun Wei, Yongxiang Yan. Lifetime challenges for the insulating pressboard of power transformer[J].Hunan Papermaking, 2015（1）：17-19.
[17]陈伟根，杨剑锋，凌云，等.变压器油纸绝缘沿面放电特性及其产气规律[J].重庆大学学报,2011,34(1):94-99.
Chen Weigen,Yang Jianfeng,Lingyun,etc. Surface discharge characteristics and gas generation law in oil-paper insulation of transformer[J].Journal of Chongqing University,2011,34(1):94-99.
[18]苑清，齐波，张书琦，等.交直流复合电压下油纸绝缘典型缺陷产气特性[J].电网技术，2018,42（9）：3093-3100.
Yuan Qing, Qi Bo, Zhang Shuqi, etc. Gas generating characteristics of oil-paper defect models under composite AC-DC Voltage[J]. Power system Technology,2018,42（9）：3093-3100.
[19]张书琦，苑清，齐波，等.交直流复合电压下油纸绝缘气隙放电模型油中溶解气体诊断[J].华北电力大学学报，2019,46（3）：50-56.
Zhang Shuqi, Yuan Qing, Qi Bo, etc.Diagnosis of DGA for air-gap discharge model in oil paper insulation under AC-DC composite Voltage[J].Journal of North China electric power university，2019,46（3）：50-56.
[20]胡小博，李坤，陈荣，等.天然酯绝缘油在油纸界面放电故障条件下的分解产气特性研究[J].绝缘材料，2019,52（11）：70-74.
Hu Xiaobo, Likun, Chen Rong, etc. Gas generation characteristics of natural ester under discharge fault at oil-pressboard interface[J]. Insulating materials,2019,52（11）：70-74.
[21]高思航，李威，柯亭婧，等.苯并三氮唑钝化剂对绝缘油中溶解气体特性的影响研究[J].中国电机工程学报,2020.
Gao Sihang, Li Wei, Ke Tingjing, etc. Investigation on the effect of benzotriazole passivator on the characteristics of dissolved gas in the insulating oil[J].Proceedings of the CSEE,2020.
[22]钱艺华，郑文杰,于钦学,等.变压器绝缘油中金属钝化剂 Irgamet 39 的消耗规律[J]. 高电压技术, 2016, 42(12): 3888-3894.
Qian Yihua, Zheng Wenjie, Yu qinxue,etc.Consumption Law of Metal Passivator Irgamet 39 in Transformer Insulating Oil[J].High Voltage,2016, 42(12): 3888-3894.
[23]DL/T 722-2014.变压器油中溶解气体分析和判断导则[S].
DL/T 722-2014.Guide to the analysis and the diagnosis of gases dissolved in transformer oil[S].2014.
[24] "CIGRE 323. Ageing of Cellulose in Mineral-Oil Insulated Transformers," CIGRE, 2007.
[25] Suwarno and R. Pasaribu, Thermal Aging of Mineral Oil-Paper Composite Insulation for High Voltage Transformer,Int. J. Electr. Eng. Inform, vol. 8, pp. 820-835, 2016
[26]Lundgaard L E, Hansen W, Ingebrigsten S. Ageing of mineral oil impregnated cellulose by acid catalysis[J].IEEE Transactions on Dielectrics and Electrical Insulation, 2008,15(2):540-546.
[27]吴广宁, 崔运光, 段宗超, 等. 有机酸对变压器油纸绝缘进一步热老化的催化作用试验研究[J]. 高电压技术, 2015, 41(3): 832-839.
Wu Guangning, Cui Yunguang, Duan Zongchao, et al.Experimental study on further thermal aging of transformer oil-paper insulation by organic acid catalysis[J]. High Voltage, 2015, 41(3): 832-839.
[28]Hohlein I, Kachler A J. Aging of cellulose at transformer service temperatures, part 2, influence of moisture and temperature on degree of polymerization and formation of furanic compounds in free-breathing systems[J]. IEEE Electrical Insulation Magazine, 2005, 21(5): 20-24.
[29]廖瑞金,冯大伟,邓帮飞,等.绝缘油中抗氧化剂DBPC对油纸绝缘老化速率及糠醛生成特性影响研究[J].电工技术学报，2018，33（7）：1652-1661.
Liao Ruijin, Feng Dawei, Deng Bangfei, et al. Influence of DBPC in insulating oil on aging rate of oil-paper system and production characteristics of furfual[J].Transactions of China electrotechnical society,2018，33（7）：1652-1661.