摘要
本文提出一种基于三次谐波电压量对大型汽轮发电机定子绕组对地绝缘状况进行在线监测的新原理,并提出基于故障零序电压在线确定金属性接地短路点位置的新方法。文中采用运行时定子绕组对地相对阻抗的数值反映其在线对地绝缘状况,并分析了该监测量的算法原理,分析了基于接地故障时零序电压大小和相位来确定短路接地点位置的思路。本文提出了大型汽轮发电机单相接地在线监测的新途径,论证了上述方法作为在线监测手段的合理性。
A novel principle based on third harmonic voltage for online monitoring turbogenerator stator insulation to ground is presented. A novel method for locating its grounding point is presented too. The on-line monitoring values of stator winding＇s impedance to ground were used to reflect it＇s insulation to ground in this paper. Arithmetic principle of the impedance was analyzed. Method for locating grounding point based on zero sequence voltage amplitude and phase was analyzed too. Authors put forward new ways for on-line diagnosing large turbogenerators stator grounding, and demonstrated that the above ways were reasonable.
出处
《大电机技术》
北大核心
2007年第5期29-31,共3页
Large Electric Machine and Hydraulic Turbine
基金
四川大学青年科学基金资助项目(06019)
关键词
汽轮发电机
定子单相接地
定子绝缘
在线监测
故障定位
turbogenerators
stator ground fault
stator＇s insulation
online monitoring
fault location
