【摘要】 随着国民经济的迅速发展 ,电力需求日益增加 ,安全可靠供电显得越来越重要。用户对电能质量及年可靠供电时间有了更高的要求 ,除了提高配电网系统自动化水平外 ,对现场常用Y Y0 接线和Δ Y0 接线的配电变压器 ,选择适应系统特点的继电保护装置显得更为突出。由于诸多城市小区智能楼宇的兴起 ,大型厂矿企业等用电大户基本上都应用这两种方式供电 ,致使传统的熔断器和继电器保护上下级之间的电流定值难以配合 ,常常造成短路容量增加。该文通过对不同接线方式配电变压器的分析 ,进行模拟现场实验 ,确定出在使用上述配电变压器时 ,在保持传统低压配电系统的过流保护的同时 ,又能使保护装置快速有效的动作 ,这样使事故率大大降低 ,提高了供电质量更多还原

【Abstract】 Electric power demand increase with the development of national economy. In this circumstance, secure and reliable power supply become more important. The costumers have higher requirement for power quality and reliability. In addition to improving automation of power distribution, the reasonable relaying for distribution transformers is necessary. This paper gives an analysis to various connection of power transformer and determines a protection scheme that in condition of keeping the traditional overcurrent relaying, improves the effective operation. Therefore, decrease the fault occurring probability, and increase the quality of power supply.更多还原