某核电站改造工程设备快速暂态过电压评估

VFTO Research and Evaluation of GIS Equipment in Nuclear Power Station Reconstruction Project

某核电站原来#1、#2号联络变因快速暂态过电压导致变压器线圈被烧损,在新增#3联络变改造项目时,设计需充分考虑快速暂态过电压对新联络变压器的影响,避免再次发生类似事故。本文采用ATP电磁暂态计算程序,建立了电站中各GIS设备的电气模型,对420 kV/525 kV GIS中扩建联络变间隔内隔离开关操作引起的快速暂态过电压进行仿真计算,通过对10种典型操作方式进行计算和评估,结果表明设备的绝缘等级等参数具备承受快速暂态过电压的能力。

One Nuclear Power Station No. 3 Unit reconstruction project has improved the transformer design due to No. 1＆2 Units had ever suffered failures of the interconnecting transformer coil by VFTO, so the new No. 3 interconnecting transformer should be fully considered the impact of VFTO to avoid the similar incidents. This article analyzed 10 routine operations about the VFTO impact to the equipment by using the ATP electromagnetic transient calculation program. The results shown that the insulation level of the equipment could fulfill the requirement of VFTO.