Ferroresonance occurrence is a source of damage, causing overvoltage on voltage transformer (VT) and isolators of the grid equipment. Some solutions are available to protect VTs from the ferroresonance overvoltage. However, they just act after the ferroresonance occurrence. In this letter, to prevent the occurrence of ferroresonance, a dc reactor-based protection device is introduced. Analytical studies and simulations by MATLAB/Simulink and Maxwell ANSYS demonstrate the capability of the proposed protection device as a VT ferroresonance inhibitor. Experimental results from a scaled-down laboratory prototype are also provided to verify the proposed solution.

中文翻译：

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电压互感器铁磁谐振：一种抑制装置

铁磁谐振的发生是损坏的根源，它会导致电压互感器 (VT) 和电网设备的隔离器出现过电压。一些解决方案可用于保护 VT 免受铁磁谐振过电压的影响。然而，它们只是在铁磁共振发生后才采取行动。在这封信中，为了防止铁磁谐振的发生，介绍了一种基于直流电抗器的保护装置。MATLAB/Simulink 和 Maxwell ANSYS 的分析研究和仿真证明了所提议的保护装置作为 VT 铁磁谐振抑制剂的能力。还提供了缩小实验室原型的实验结果，以验证所提出的解决方案。