基于集成原理的牵引变压器低压侧过电流保护

Integration Principle Based Traction Transformer Low Voltage Side Over-voltage Protection

目前牵引变电所大多采用过电流保护切除变压器低压侧和母线故障,为保证选择性,该保护动作时限设置较长,不利于故障迅速识别,不能满足运行要求。集成保护同时可采集变电所的所有信息,形成新的保护原理,提高保护的整体性能。本文基于集成保护原理,提出了一种过流保护方案,该方案能迅速准确判断变压器低压侧尤其是母线故障,有效地降低了动作时限,提高了保护性能。同时对集成保护在牵引变电所的实现做了初步探讨。

For the problem that over-current protection is used to remove the faults of transformer low-voltage side and bus line in railway traction substation. In order to ensuring selectivity its long movement time limit go against the fault identification and can not meet operational requirements. The integrated protection can gather all informations in traction substation and form new protection features to improve the overall performance of the protection. In this paper, based on integrated protection principle an over-current protection scheme is proposed to determine the faults of transformer low voltage side quickly and accurately especially in bus line, which decrease the movement time limit effectively and improve the overall performance of the protection. The preliminary study on integrated protection achievement in railway traction substation is also explored.