基于扇形绕组抑制变压器励磁涌流探究

Study of Excitation Current of Transformer based on Fan-winding

电力变压器属于发电厂及电力系统的重要设备,变压器的平稳工作决定着电力系统的稳定运行。电力变压器空载接入电源或变压器出线发生故障被继电保护装置切除时,因变压器某侧绕组感受到外施电压的骤增而产生数值极大的励磁涌流。励磁涌流不仅峰值大,而且含有极多的谐波及直流分量。在这种情况下出现的励磁涌流不单会使变压器本身损坏,使其使用年限减少,而且还会冲击电网及电力变压器附近的用电设备,为此要高度重视,进而针对扇形绕组可以抑制变压器励磁涌流进行探究。

Power transformer is an important equipment in power plant and power system, the stable operation of the transformer determines the stable operation of the power system.When the power transformer no-load access power supply or transformer outlet line is removed by relay protection device,due to the sudden increase of the external voltage in some winding of the transformer, the excitation current is extremely high.The excitation current not only peaks, but also contains a lot of harmonic and dc components.ln this case, the excitation current will not only damage the transformer itself, but also reduce the use of the transformer, it will also hit the power grid and the power transformer near the power transformer, furthermore, the fan winding can be used to explore the transformer excitation current.