大型燃气-蒸汽联合循环电厂发电机保护设计特点

Design Speciality of Generator Relay Protectrion for the Largescale GasSteam Combinedcycle Power Plant

介绍三菱公司的9F型单轴燃气-蒸汽联合循环电厂发电机保护设计特点。结合BJSR电厂的实际情况,系统地分析发电机中性点采用电阻接地方式和配电变压器接地方式对发电机的影响,发电机保护动作出口设计与燃煤机组的区别,以及发电机组差动保护用电流互感器参数选择。

This article introduces the generator relay protection design speciality for the MHI＇s 9F series single - shaft gas - steam combined - cycle power plant, According to the actual situation of the BJSR power plant, the author systematically analyze the main factors which influences the generator stator respectively for the generator neutral grounding transformer mode and generator neutral high resistance grounding mode, and the explain that the generator protection action is different from the coal - fired plant, as well as technical data of the generator bushing current transformers used for the differential protection.