【作者】 唐军；

【导师】 陈伟根；

【作者基本信息】 重庆大学 ， 高电压与绝缘技术， 2001， 硕士

【摘要】 电力变压器是变电站最昂贵的设备，也是事故多发的电气设备之一，其运行的可靠性直接关系到电力系统的安全及供电的可靠性，为保证电力系统的安全运行，必须加强对运行电力变压器绝缘的监测与诊断。 通过对主变压器套管介损在线监测原理及应用的研究，提出了以电流和电压过零相位差为原理的在线监测介损的方法，分析了产生误差的原因及系统干扰的来源，提出了适合现场实际的抗干扰的方法，通过现场实测数据说明了变压器套管介损在线监测系统可行性。 通过对变压器局部放电的在线监测原理及方法的研究，提出了有高频谐振电流传感器、抗干扰调节系统及信号采集系统组成的局部放电在线监测方案，并分析了抑制干扰的方法。 通过对主变铁芯接地电流的在线监测技术的研究，提出了采用不同档次长线传感器在线监测铁芯接地电流的新方法。 通过对主变油中六种溶解气体在线监测原理及应用的研究，提出了以渗透膜、多传感气敏元件检测油中多种气体为特征的变压器油中六种溶解气体色谱在线监测方法，通过现场实测数据分析了其运行的稳定性与可靠性。 论文通过对宜宾白沙220KV变电站主变压器实施多参量在线监测原理及方法的研究，为无人职守站的推广应用和及主变压器在线监测装置做出了实际尝试。整体装置的现场运行表明：该系统运行稳定、数据可靠，具备在线监测的能力，可作为变压器状态检修的依据。更多还原

【Abstract】 Main transformer is most costly and easily goes wrong. The security and reliability of the power system is directly influenced by its reliability. The monitoring and diagnosis of transformer is necessarily reinforced. The paper presents the method and principle of on-line monitoring of dielectric loss based on the theory of phasic difference which current and voltage pass zero. As the same time, it analyzes data measured in the substation and the reason of error. Secondly, The paper studies the method and principle of on-line monitoring of partial discharge and presents the monitoring project base on the system which includes high frequency syntonic sensor, anti-jamming control and signal sampling. The method of disturb elimination is given. Thirdly, The paper researches the on-line monitoring of grounding current in core and presents the new method that adopts diverse long-string sensor. The paper analyses the meaning of the implement of transformer insulation faults diagnosis in the substation based on chromatogram of transformer oil, the direction of transformer insulation faults diagnosis technology and brings forward the on-line monitoring equipment which can detect six gases dissolved in transformer oil, and is charactered with infiltrative film. A great deal locale data proves the stabilization of this system. The paper studies the method and principle of multi-parameter on-line monitoring system and application of main transformer insulation for Basha 220kv transformer substation in Yibin. The system can reflect the actual state, and can become the warrant of condition service.更多还原