数字式变压器快速后备保护的设计与运用

The design and application of digital quick standby protection for transformer

在 1 1 0kV变电站的 1 0kV母线上一般都不装设母线保护 ,这样当发生 1 0kV母线上的短路故障后 ,切除故障就要靠该站变压器 1 0kV侧的后备保护。后备保护的时限按与出线过流保护时限配合整定 ,延时都在2 .0s以上 ,因而切除故障的时间长 ,导致设备损坏严重。本文结合云南滇东电网的实际情况 ,对这样的变电站主变保护的配置及设计作出探讨 。

Usually there are no bus bar protection in 10kV bus bar of 110kV substation. Therefore, when short circuit fault in 10kV bus bar occurs, to remove the fault depends on standby protection at 10kV side of transformer. The set time of the protection has to be cooperated with that of outgoing_line overcurrent protection, then time_delay is over 2 seconds.So the time of removing fault is long, the equipment is badly damaged. Considering the facts of Yun Nan Province Diandong electric power network, the configuration and design of main transformer for the substation are discussed. A new operation mode and complete protection configuration scheme are brought forward.