变压器铁芯饱和统一模型建立及其判别方法

发布时间：2018-05-27 17:11

本文选题：变压器铁芯饱和 + 励磁涌流　；参考：《电力系统自动化》2016年24期

【摘要】：建立了变压器铁芯饱和的统一模型,推导出磁链最大值与电压突变时刻、突变前后电压相角差及突变后电压幅值的关系式,铁芯是否饱和与这些参数密切相关。发现电压降低(如系统发生故障或者非同期合闸操作)情况下也会产生铁芯饱和,因而以电压幅值降低作为变压器不会产生励磁涌流的依据并不可靠。进而提出一种基于电压量积分的铁芯饱和判别方法,该方法对空载合闸、故障切除、和应涌流、系统故障或操作等电压突变引起变压器铁芯饱和而产生励磁涌流,都能在半个周期左右的时间完成判别,为差动保护不经涌流闭锁提供了一种有效、快速的实现方法,可显著提高运行变压器发生内部故障时差动保护的动作速度。
[Abstract]:A unified model of transformer core saturation is established. The relationship between the maximum flux value and the voltage abrupt time, the voltage phase angle difference before and after the abrupt change, and the voltage amplitude after the sudden change are derived, and whether the core is saturated or not is closely related to these parameters. It is found that if the voltage is reduced (such as the fault of the system or the closing operation at the same time), the core saturation will also occur, so it is not reliable to use the voltage amplitude reduction as the basis for the transformer not to produce the inrush current. Furthermore, a method based on voltage integration is proposed to distinguish the saturation of iron core. The method can cause the transformer core saturation and cause inrush current caused by the voltage abrupt changes such as no-load closing, fault removal, inrush current, system fault or operation. All of them can be judged in about half a period of time, which provides an effective and fast method for differential protection without inrush current locking, and can significantly improve the operation speed of differential protection in the event of internal failure of transformer.
【作者单位】：南瑞集团公司(国网电力科学研究院);智能电网保护和运行控制国家重点实验室;国电南瑞科技股份有限公司;
【分类号】：TM41

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