少油设备PD绝缘缺陷油面特征气体的变化特性
Change Characteristics of Characteristic Gas for Oil Surface Under PD Insulation Defects in Oilless Equipment
张国治 1黄雅兰 1叶高翔 2刘翔 1闫伟阳 1张晓星3
作者信息
- 1. 湖北工业大学新能源及电网装备安全监测湖北省工程研究中心,武汉 430068
- 2. 湖北省电力有限公司经济技术研究院,武汉 430077
- 3. 湖北工业大学新能源及电网装备安全监测湖北省工程研究中心,武汉 430068;襄阳湖北工业大学产业研究院,襄阳 441100
- 折叠
摘要
少油设备存在油量非常少、钢性全密封结构以及缺少防爆措施的客观特征,长期的局部放电(partial discharge,PD)绝缘缺陷会诱发设备爆炸、起火等安全事故的发生,而少油设备一直缺乏有效的PD绝缘缺陷检测、诊断技术.基于此,通过搭建110 kV正立式电流互感器PD绝缘缺陷油面气体检测实验平台,试验研究了少油设备不同PD强度下油面特征气体变化规律及其与油中溶解气体的关联特性,试验结果表明:PD特征气体H2、CH4、CO在油面上富集明显,且浓度增速远大于油中的值,基于油面气体的PD检测较油色谱检测有着更高的灵敏度;当PD绝缘缺陷严重劣化时,油中溶解气体浓度增速无明显提升且关键气体C2H2未达到预警值,而油面特征气体浓度均出现明显突增,其中H2、C2H2的浓度增量最为显著,C2H2体积分数可以达到17.41×10-6,在放电缺陷劣化过程中通过捕捉该变化能够有效预警击穿放电的发生.油面气体浓度能够有效表征少油设备内部PD缺陷的产生、发展,该研究成果为少油设备PD绝缘缺陷的高灵敏监测提供了新的解决思路.
Abstract
Oilless equipment has the objective characteristics of very low oil quantity,fully sealed steely structure,and lack of explosion-proof measures.Long-term partial discharge(PD)insulation defects can induce equipment explosions,fires and other safety accidents,while oilless equipment has been lacking effective PD insulation defect detection and di-agnosis techniques.Based on this,this paper builds an experimental platform for oil surface gas detection of PD insulation defects in 110 kV positive and vertical current transformers,and experimentally investigates the characteristic oil surface gas variation law and its correlation characteristics with dissolved gas in oil under different PD strengths of oilless equipment.The test results show that the PD characteristic gases H2,CH4 and CO are significantly enriched on the oil surface and the concentration increase rate is much higher than that in the oil,so the PD detection based on the oil sur-face gas has higher sensitivity than the oil chromatography detection.When the PD insulation defect is seriously deteriorated,the dissolved gas concentration in the oil does not increase significantly and the key gas C2H2 does not reach the warning value,while the characteristic gas concentration on the oil surface all show a significant and sharp increase,among which the concentration of H2 and C2H2 is the most significant,with the concentration of C2H2 reaching 17.41×10-6.By capturing this change during the deterioration of the discharge defect,the occurrence of breakdown dis-charge can be effectively warned.The oil surface gas concentration can effectively characterize the generation and development of PD defects within oilless equipment.The results of this paper provide a new solution for the highly sensi-tive monitoring of PD insulation defects in oilless equipment.
关键词
少油设备/局部放电/油面特征气体/溶解气体分析/产气规律Key words
oil less equipment/partial discharge/oil surface gas/dissolved gas analysis/gas production pattern引用本文复制引用
基金项目
国家自然科学基金(52107144)
湖北省教育厅科技项目(Q20211401)
出版年
2024
国家科技期刊平台
NSTL
万方数据