摘要
为降低220kV主变压器中压侧死区故障对变压器的冲击,文中通过分析220kV变电站内发生主变压器中压侧死区故障的各类故障特点,并对变压器微机保护回路进行研究,提出了在现有主变压器后备保护的基础上增设中压侧死区保护的设想。根据中压侧死区故障特征量分析并得出保护启动条件,同时根据断路器额定开断时间确定该保护动作时限,通过对主变压器微机保护二次接线的研究,实现了其在生产实际中的应用。
In order to reduce the impact of dead zone fault on transformer from the 220 kV main transformer mid-voltage side,the various type fault characteristics of main transformer mid-voltage side dead zone fault in 220 kV substation are analyzed,and the microprocessor-based protection circuit for transformer is studied.Finally,it concludes that the mid-voltage side dead zone protection should be added to the existing backup protection.After this improvement,the protection act conditions according to the analysis from the mid-voltage side dead zone fault feature and the protection action time according to the rated breaking time of the circuit breaker are inferred.Through the study on microcomputer-based protection circuit of the main transformer,the actual application in production is implemented.
出处
《电力系统自动化》
EI
CSCD
北大核心
2012年第21期118-120,共3页
Automation of Electric Power Systems
关键词
220KV主变压器
中压侧
死区故障
短路电流
后备保护
220 kV main transformer
mid-voltage side
dead zone fault
short-circuit current
backup protection
