高分求英文翻译（满意续加150）

来源：百度知道 编辑：UC知道 时间：2024/06/01 08:43:35
电力变压器是电力系统中重要的设备之一，其运行正常直接关系到整个电网可靠性，因此要求变压器继电保护要具有较高的可靠性。纵差保护一直作为电力变压器的主保护，长期运行经验表明纵差保护能够灵敏地区分变压器内和区外故障，但在变压器空投和外部故障切除后电压恢复时，则可能会出现数值可与内部故障电流相比拟的励磁涌流，导致差动保护误动。当前变压器差动保护的关键问题仍然是如何准确鉴别励磁涌流和内部故障电流。
励磁涌流是变压器突然空载合闸时产生的一种很大的冲击电流，本文分析了它产生的原因及特征，同时也研究了区分变压器励磁涌流和故障电流的各种方法。
利用相似度原理进行励磁涌流鉴别，就是利用了二次谐波以外的偶次谐波分量，分别用全波傅里叶算法和半波傅里叶算法得到基波幅值,再引入相似系数用以评价全波和半波两种傅里叶计算结果的相似度,具有较好的励磁涌流制动效果。软件结果也表明，该方法判断和计算过程都比较简洁，检测速度较快，将是一种有前景的方法。

Power transformer in the power system is an important one of the equipment and its direct relationship to the normal operation of the entire power grid reliability, and therefore asked the transformer relay to have a high reliability. Differential protection as has been the main power transformer protection, long-term operational experience has shown that differential protection to sensitive areas within the sub-transformer and outside fault, but in dropped and external transformer fault with the resumption after the voltage, may experience with the internal numerical Fault current comparable to the inrush current, resulting in differential protection malfunction. The current transformer differential protection remains the key issue is how to accurately identify inrush current and internal fault current.
Transformer inrush current is suddenly empty at the closing of a significant impact on current, the paper analyzed the reasons for it and characteristics, but also on the disti