Ferroresonance has been a widely studied area in the last few decades due to the nonlinear behavior and power quality problems it presents. Some power quality problems related to the ferroresonance phenomenon are sustained overvoltage and overcurrent and maintained levels of waveform distortions. The phenomenon can lead to the dielectric breakdown of electrical equipment, thermal problems, and misoperation of protective relays. It can present itself in a circuit that involves a nonlinear inductance associated with capacitance and low losses. This paper analyzes the ferroresonance test in a capacitor voltage transformer through Simulink ® simulation. It divided a cycle of a sine wave into 72 different points to apply controlled short-circuits in the secondary terminal of the transformer. The aim is to study the relationship between the time when a short-circuit is applied, and the peak voltage of the first positive half-cycle after the short-circuit is removed. Therefore, the worst-case scenario of the short-circuit application was verified. Results demonstrate that there is a most critical situation during short-circuits at the CVT’s secondary terminals.

中文翻译：

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电容式电压互感器的铁磁谐振评估

由于其呈现的非线性行为和电能质量问题，铁磁谐振在过去几十年中一直是一个广泛研究的领域。一些与铁磁谐振现象相关的电能质量问题是持续的过压和过流以及维持的波形失真水平。这种现象会导致电气设备的介质击穿、热问题和保护继电器的误动作。它可以出现在涉及与电容和低损耗相关的非线性电感的电路中。本文通过 Simulink ® 仿真分析了电容式电压互感器中的铁磁谐振测试。它将正弦波的一个周期分为 72 个不同的点，以在变压器的次级端子中应用受控短路。目的是研究施加短路的时间与消除短路后第一个正半周峰值电压之间的关系。因此，验证了短路应用的最坏情况。结果表明，在 CVT 的次级端子短路期间存在最危急的情况。