大型发电机变压器保护技术的现状剖析和发展动向

针对国内外电气主设备保护的通病，章指出并分析它们的问题所在，同时给出有效的解决方法。主设备保护工作应该清楚发电机和变压器绕组发生短路的类型和数量、故障位置和短路匝数；大型发电机和变压器主保护一定要做绕组内部短路计算，据此进行保护灵敏度校验，按照“优势互补、综合利用”的原则最终制定主保护配置总方案，使保护设计工作做到定量化和科学性。N(YN)接线绕组的超高压变压器应增设零序差动保护。阻抗保护不宜作为大型发电机变压器绕组的近后备保护。

The Current Status and Development Trend of Protection Technique for Large- Sized Generator and Transformer

The common fault of main equipment protection at home and aboard is pointed out and analyzed, and effective solving method is put forward at the same time. The protection engineers should understand the possible fault type, fault number, fault position and short-circuited coil number occurring in the winding of generator and transformer. The design of main protection configuration scheme for the large-sized generator and transformer must be based on the simulation of stator winding internal faults and the check of protection sensitivity. The final main protection scheme is optimized according to the design principle of advantage complementation and comprehensive utilization. Quantitative and scientific design achievement can be acquired by using above design method and it is beneficial to the safe operation of the large sized generator and transformer. The zero-sequence differential protection ought to be added at the star winding of extra-high voltage transformer. The impedance protection isn't suitable to be used as short-range backup protection for the large-sized generator and transformer.