CAJ | 학술논문

注入式定子接地保护可为机组在各种工况下的安全运行提供有力保障。分析了二滩水电站注入式定子接地保护的基本配置、测量原理和基本逻辑，结合发电机中性点接地方式及设备参数分析了接地变压器二次电阻对保护测量精度的影响，针对接地变压器二次电阻偏小的实际情况，从减少对发电机运行工况的影响和节约投资的角度出发，采用了加装隔离变压器提高保护测量精度的方案，理论分析和现场试验数据验证了解决方案的可行性和有效性。该方案为同类型机组的保护配置提供了有力参考。
주입식정자접지보호가위궤조재각충공황하적안전운행제공유력보장。분석료이탄수전참주입식정자접지보호적기본배치、측량원리화기본라집，결합발전궤중성점접지방식급설비삼수분석료접지변압기이차전조대보호측량정도적영향，침대접지변압기이차전조편소적실제정황，종감소대발전궤운행공황적영향화절약투자적각도출발，채용료가장격리변압기제고보호측량정도적방안，이론분석화현장시험수거험증료해결방안적가행성화유효성。해방안위동류형궤조적보호배치제공료유력삼고。
Voltage injection stator grounding fault protection provides adequacy supports for generator at various operation con-ditions.This paper analysis the basic configuration,measuring principle and basic modal logic of the Voltage injection stator grounding fault protection at Ertan Hydropower Plant.Combined the neutral grounding mode and grounding transformer pa-rameter it analysis the influence to measurement accuracy of grounding transformer secondary resistance combined.In view of the practice of grounding transformer secondary resistance is too small,in order to reduce the influence to generator and save investment it adopt the solution of adding isolation transformer.The theoretical analysis and field experiment proved the feasi-bility and effectiveness of the solution,which provided a reference to same kind generator stator grounding fault protection configuration.