秦山第二核电厂500kV出线三相电流不平衡现象的测试及分析

TESTING AND ANALYSIS OF THREE PHASE CURRENT UNBANLANCE AT 500kV OUTLET OF THE 2nd QINSHAN NUCLEAR POWER PLANT

超高压输电线路中都存在不同程度的三相电流不平衡现象,作者通过对秦山第二核电厂 500kV 出线的三相电流不平衡现象进行综合测试和定性分析,提出电网元件不对称和线路潮流的变化是产生三相电流不平衡的主要原因,并提出了相应的对策;认为从电网安全的角度来讲,目前秦二厂出线的三相电流不平衡不会对电网及核电厂的安全运行造成影响。

Three phase current unbalance commonly exists in UHV transmission lines. Through the comprehensive testing and qualitative analysis of the three phase current unbalance at the 500kV outlet of the 2nd Qinshan nuclear power plant, the authors pointed out that the main reason of three phase current unbalance is the asymmetry of power network components and the variation of power flow, and corresponding countermeasures were proposed. From the viewpoint of power network security, at present the three phase current unbalance at the 500kV outlet of the 2nd Qinshan nuclear power plant would not affect the secure operation of power network and nuclear power plant.