电厂发电机变压器组保护的改造

根据运行经验和继电保护实施细则,制定了射阳港电厂1、2号发电机变压器组保护进行双重化改造的方案。2套保护在互感器、工作电源和出口回路上独立,每套保护的主保护、后备保护和非电量保护完整。对低励失磁保护、过激磁保护、过电压保护、定子接地保护和断路器失灵保护在实际运行中存在的影响机组安全稳定运行的问题进行了分析,并结合双重化改造提出了原理和应用上的改进措施。实践表明,双重化改造后的机组保护是安全可靠的。

Reconstruction of power plant generator-transformer protection

According to power plant operation experiences and detailed regulations of protection implementation,a redundant reconstruction scheme for generator-transformer protection No.1 and No.2 of Sheyanggang power plant is produced.The transformer,power supply and trip circuit of two protection sets are independent and each set is completely integrated with main protection,backup protection and non-electricity protection.Problems occurred in actual operation of loss-of-field protection,overexcitation protection,overvoltage protection,stator earthing protection and breaker failure protection,which influence the safe and stable operation of power plant,are analyzed.Combined with the redundant reconstruction,improvements in principle and application are brought forward.Practices prove that the reconstruction scheme is safe and reliable.