西北电网330kV自耦变压器零序过流保护配置及整定计算研究

Study on Configuration and Setting Calculation of 330kV Autotransformer's Zero Sequence Overcurrent Protection in Northwest Power System

通过对西北电网 330kV自耦变压器零序过电流保护的配置和整定计算的研究 ,针对其大多数配置和整定计算不满足规程要求及西北电网变压器后备保护第Ⅰ段最后一级 (跳三侧 )动作时限不大于 2s的规定 ,提出了适合西北电网特点 ,既能以较短时限动作切除故障又不失去选择性的 330kV自耦变压器零序过电流保护的配置。

Configuration and setting calculation of 330kV autotransformer's zero sequence overcurrent protection in northwest power system are studied in this paper. For most configuration and setting calculation are not satisfied with technical code, and it is specified that tripping time (trip at three sides) of final stage at first section of transformer's back-up protection should not be more than 2 seconds, therefore the principle of configuration and setting calculation suitable for northwest power system are presented. It can both isolate fault in short time and not lose selectivity.