涌流

It is the existent of magnetizing inrush current in transformer that differs transformer differential protection from differential protection of other main equipments and transmission lines.

由于变压器励磁涌流的存在，使得变压器差动保护有别于其他主设备及线路的差动保护。

This transformer protection scheme is immune to the magnetizing inrush current influence and does not need the accurate parameter of transformer. The scheme is simple and has been proved with the simulation test and dynamic analog test.

该变压器保护方案不受励磁涌流的影响，而且无需精确取得变压器的内部参数，实施简单，仿真和动模试验结果证明了该原理的可行性。

How to discriminate between internal fault and magnetizing inrush current is the difficulty of transformer protection when apply differential relay.

变压器主保护选择差动在原理上存在不足，带来的问题就是如何准确鉴别励磁涌流与内部故障，这也是目前变压器保护的难点。

This paper describes the simulation of magnetizing inrush current in transformer,which is calculated by conventional method and four-order Runge Kutta,respectively.

本文采用常规方法及四阶龙格库塔法对单相变压器合闸过渡过程进行计算，利用面向对象的Delphi语言以及Access数据库，开发了合闸涌流可视化仿真软件。

Existing principles of transformers main protection, especially in criterions of magnetizing rush current, are analyzed deeply in this paper. The author points out questions in existence, and describes a new method based on the sum of positive sequence active power flowing into transformers from each terminal.

本文就现有的电力变压器主保护原理，特别是各种励磁涌流判据，进行了较深入的分析，指出了存在的问题，并提出了新的基于正序功率的变压器纵差保护原理。

The waveform of differential current in each data window is divided into four parts averagely according to time, and the area-ratio among the four parts can be used to distinguish magnetizing inrush from internal fault current.

该算法以工频一周波为数据窗长，将数据窗内的差流波形按时间均分为4份，根据各份面积之间的比值来识别励磁涌流和内部故障电流。

In the transformer differential protection, it is a congenital and difficult problem that cant be avoided how to distinguish the magnetizing inrush current with the internal fault current. It has become the focus studied for many years. The existing transformer protection principles all have certain defects and the main reason lies in inadequate understand of the transformer fault mechanism.

在变压器差动保护中，如何区分励磁涌流与内部故障电流是一个先天性的、不可回避的难题，多年来一直成为研究的热点，而且现有的变压器保护原理也都存在一定的缺陷，其主要原因在于对变压器内部故障的机理认识不够。

Parameter identification transformer protection linear model magnetizing inrush current

参数辨识；变压器；保护；线性模型；励磁涌流

Which magnitude is smaller and which sign is negative.

该原理不受励磁涌流的影响，EMTDC仿真验证了其可行性。

The nerve center number of hidden floor is hence changed to opt...

仿真试验表明由该方法设计的模型进行涌流识别效果良好。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。