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Experience with transformer interaction with low amplitude high oscillatory switching transients in a power utility network

机译:在电力网络中具有低振幅高振荡开关瞬变的变压器交互经验

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Resonance in electrical equipment is a major concern regarding the protection of such devices in a grid connected power system. A portion of an integrated steel plant of Steel Authority of India Limited has been simulated to identify high frequency voltage transients across the distribution transformer winding at various switching events using Alternative Transient Program (ATP). The frequencies in voltage oscillation, generated by switching, are distinguished by Short Time Fourier Transform (STFT) using MATLAB and are analyzed by tallying with the natural frequencies of winding using Frequency Response Analysis (FRA) method. This paper emphasizes the winding resonance due to switching which is the cause of transformer failure of Durgapur Steel Plant (DSP). The results have revealed that under certain switching circumstances the voltage level of the winding exceeds the transformer's Basic Insulation Level (BIL) which leads to the failure of transformer.
机译:电气设备中的谐振是与并网电力系统中的此类设备的保护有关的主要问题。已模拟了印度钢铁管理局有限公司的一家综合钢铁厂的一部分,以使用备用暂态程序(ATP)在各种开关事件下识别配电变压器绕组两端的高频电压瞬变。切换产生的电压振荡频率通过使用MATLAB的短时傅立叶变换(STFT)进行区分,并使用频率响应分析(FRA)方法通过计算绕组的固有频率进行分析。本文强调了由于开关引起的绕组谐振,这是杜尔加布尔钢铁厂(DSP)变压器故障的原因。结果表明,在某些开关条件下,绕组的电压电平超过了变压器的基本绝缘水平(BIL),这导致了变压器的故障。

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