摘要
在介绍和分析变压器励磁涌流产生原因和机理、励磁涌流特点、目前保护装置中常用的几种制动原理的基础上,重点介绍了二次谐波制动中存在的问题,提出了几种增强变压器保护励磁涌流识别能力的新措施,包括:调整差动电流来改善分相制动;增加涌流浮动门槛定值功能;通过算法来捕捉二次谐波数据的趋势判据;在差动保护装置中增加自适应短时投入的循环闭锁功能。这些措施能够有效消除原有二次谐波制动的不足,大大提高了变压器保护的安全性和灵敏性。
On the basis of introducing and analyzing cause, mechanism of surge current and several braking principles of cur rent protective devices, the paper mainly introduces existing problems in secondary harmonic brake and proposes new ures for enhancing recognition capability of excitation surge current protection of transformer： improve phasic braking by adjusting differential current; add value fixing function of floating threshold of surge current; capture the trend criterion of secondary harmonic data by means of algorithm; equip the differential protection device with self-adaptive cycling locking. These measures can handle disadvantages of secondary harmonic braking and greatly improve safety and flexibility of trans- former protection.
出处
《广东电力》
2012年第6期15-18,23,共5页
Guangdong Electric Power
基金
973项目基金资助(2009CB724508)
关键词
励磁涌流
谐波制动
变压器保护
差动电流
excitation surge current
harmonic braking
transformer protection
differential current
