SF6分解物检测在高压直流套管故障诊断中的应用

随着气体绝缘设备在电力系统中的广泛应用,SF₆分解物检测成为电力设备状态评估与故障诊断的有效方法。然而目前的研究大都集中于GIS（气体绝缘开关装置）,在换流站直流穿墙套管和换流变压器阀侧套管方面少有研究。为此,在介绍SF₆气体分解机理和分解物检测技术的基础上,并依据套管分解物检测结果,分析换流站套管SF₆分解物的组分含量及其生成规律。通过2个现场检测套管SF₆分解物异常实例,说明生产现场开展SF₆分解物检测时,应综合实验室检测、电-声-气联合检测及电气试验等手段,并结合历史数据与资料,对异常检测结果进行系统化分析。最后,讨论了SF₆分解物检测技术目前存在的主要问题。

Application of Detection Technology of SF6 Decomposition Products to Fault Diagnoses of HVDC Bushings

Detection technology of SF₆ decomposition products is an important method of electrical power equipment condition assessment and fault diagnosis along with wide usages of gas-insulated devices in power grids. However, most researches have been focused on GISs (Gas Insulated Switchgears), with a rare study on gas insulated wall-bushings and bushings at the valve-sides of converter-transfomers. According to SF₆ decomposition mechanism and detection technology and based on data of SF₆ decomposition products obtained from bushings in converter stations, regular patterns of SF₆ decomposition and its products are analysed. By two field examples, a suggestion is given that abnormal data of SF₆ decomposition shuold be systematically analysed by a comprehensive method with laboratory tests, electrical tests, electrical-ultrasonic wave detection and historical analyses. Eventually deficiencies of SF₆ decomposition-product detections are discussed.