电压互感器一次侧加装消谐器后三相电压不平衡原因分析

Analysis of Three-phase Voltage Imbalance after Installing Ferroresonance Eliminator at Voltage Transformer Primary Side

针对变电站电压互感器一次侧加装消谐器后出现明显的二次侧三相电压不平衡现象,以110 kV马街站实测数据为例并结合消谐器原理进行了分析,找出了主要原因,提出了此现象发生时具体的查找方法和解决对策。实际应用证明,一次侧中性点加装消谐器是目前解决铁磁谐振比较好的方法。

Aiming at the obvious three-phase voltage imbalance at second side after installing ferroresonance eliminator at primary side of a voltage transformer in some substations, the recorded data from Majie 110 kV Substation was analyzed based on the theory of ferroresonance eliminator. The common key reason for imbalance was found out, and a method to detect and solve the imbalance was proposed. The practical application proves that installing ferroresonance eliminator at neutral point of primary side of a voltage transformer can eleminate ferromagnetic resonance.