500kV鹏城变电站220kV失灵回路分析

为满足失灵回路的反事故措施要求，配合500kV鹏城变电站4号主变压器扩建，对该变电站220kV失灵保护进行全面改造。旧失灵回路的改造及新失灵回路的接入都是在局部停电时或不停电进行的，回路改造的危险性更加凸显。根据新旧失灵回路的不同，详细阐述了失灵回路改造中的细节问题以及改造中存在的危险点．并结合该变电站220kV旧失灵回路的特点给出了合理的改造方案。

220 kV Malfunction Loop Analysis of 500 kV Pengcheng Substation

To accommodate the expansion of 500 kV Pengcheng substation with the fourth main transformer, a comprehensive transformation of the 220 kV malfunction loop is conducted to meet the requirements of anti-accident measures for the 220 kV malfunction loop. Because of the local power cut or live line work, the risk of loop transformation becomes even more prominent with the old and new malfunction loop transformation. According to the difference of the old and new malfunction loop, the dangers and details existed in the transformation are elaborated in this paper, and the reasonable transformation plan is given based on the characteristics of the old malfunction loop.