CAJ | 학술논문

为了快速、准确诊断汽轮发电机励磁绕组短路故障，该文从汽轮发电机电磁功率和无功功率的表达式出发，分析了短路故障后发电机运行点的变化规律。借助于空载电动势与励磁电流的正比例关系，建立励磁绕组正常时的发电机电磁功率和无功功率计算模型，用以计算发电机运行过程中电<br>　　磁功率和无功功率的期望值，并将其与实测的电磁功率和无功功率比较，当偏差超过一定数值时判断汽轮发电机存在励磁绕组短路故障，故障实例证实该方法的有效性。该方法为非侵入式的在线监测方法，具有较高的灵敏度，在发电机进相、迟相和调相运行时均可有效诊断励磁绕组短路故障。
위료쾌속、준학진단기륜발전궤려자요조단로고장，해문종기륜발전궤전자공솔화무공공솔적표체식출발，분석료단로고장후발전궤운행점적변화규률。차조우공재전동세여려자전류적정비례관계，건립려자요조정상시적발전궤전자공솔화무공공솔계산모형，용이계산발전궤운행과정중전<br>　　자공솔화무공공솔적기망치，병장기여실측적전자공솔화무공공솔비교，당편차초과일정수치시판단기륜발전궤존재려자요조단로고장，고장실예증실해방법적유효성。해방법위비침입식적재선감측방법，구유교고적령민도，재발전궤진상、지상화조상운행시균가유효진단려자요조단로고장。
In order to diagnose field winding short-circuit fault within turbine generators quickly and accurately, based on the expressions of turbine generator electromagnetic and reactive power, this paper analyzed the variation of generator operating points after a short-circuit fault. With the aid of proportional relationships between the no-load electromotive force and the excitation current, the electromagnetic power and reactive power calculation models were established when the field winding was normal, which were used for the calculation of their expectations, and the measured electromagnetic power and reactive power were compared with the expectations. When the deviation exceeds a certain value, the field winding short-circuit fault within the turbine generator is recognized, and the fault examples demonstrate the effectiveness of this method. The method is a non-invasive on-line monitoring method with high sensitivity. No matter the generator runs at lagging-phase, leading-phase or modulating-phase states, the field winding short-circuit fault can be effectively diagnosed.