6kV厂用电系统铁磁谐振过电压现象的根除

引起铁磁谐振过电压的根本原因在于小电流接地系统对地容抗和电压互感器的感抗产生串联谐振。根除办法是改变系统的对地电容 ,改善电压互感器的特性 ,破坏谐振的产生条件 ;在通过计算发现可能产生铁磁谐振的系统 ,可在PT开口三角加消谐器 ;对于基波谐振 ,还应在PT一次中性点加消谐器。

Elimination of Ferromagnetic Harmonic Cycling Overvoltage in 6 kV Auxiliary Systems

This paper analyses the ferromagnetic systony,calculating with engineering situation. From analyzing and calculating it appointed out that the reason causing ferromagnetic systony is that little current grounding systems' capacitive reactance to ground and PT's inductive reactance would cause series-connected resonance. The method to eliminate it is reforming the system's capacitance to ground, improving factors of voltage transformer, destroying the condition that causing resonance; In the system that it would happened ferromagnetic systony by calculation, we can use opened-triangle and xiaoxieqi, if it happened fundamental-harmonic ferromagnetic systony we would use xiaoxieqi at primary winding's neutral point of voltage transformer.