注入式定子接地保护离线整定平台研究

Research on ground protection offline platform for injection stator

发电机保护新投运前需对定子接地保护整定补偿参数,保证保护测量准确。补偿参数整定建立在模拟接地试验基础上,不断的重复接地试验,调整参数,直到测量准确,这种方法效率较低。为解决该问题,提高工作效率,本文对注入式定子接地保护原理进行研究和分析,找出了南瑞发变组保护中注入式定子接地保护测量接地电阻的方法,并对其进行仿真,通过试验,证明了仿真的正确性。在仿真正确的基础上,建立了注入式定子接地保护离线整定平台。通过做3次不同阻值的定子接地试验,即可整定出注入式定子接地保护的补偿参数,并通过试验证明了平台的实用性。

It is needed to adjust the compensating parameter for the stator ground protection before a new generator running, and the protection measurement should be accurate. The compensating parameter adjusting is determined on the basis of the numerical ground experiment, and need to be tested again and again to make sure the test accuracy. So this method is inefficient. To improve the efficiency of this method, the principle of injection stator ground protection is investigated and analyzed. Then the ground resistance test method for nanrui unit is found, and numerical simulation is conducted to validate the accuracy of this method. Based on the numerical simulation, the ground protection offline platform for injection stator is established. By using this platform, the compensating parameters can be determined by three different resistance tests.