变压器

The fault diagnosis of power transformer is very important in power system.

电力变压器故障诊断对电力系统的安全运行有着十分重要的意义。

The transformer fault diagnosis is very important to the safety and economic operation of power system.

电力变压器故障诊断对电力系统的安全经济运行有着十分重要的意义。

And when combined with the front of response signal, the fault type could be distinguished.

对于极少部分具有这种变形的变压器，两种方法难以有效地检测。

From two sets of field test data, i.e., the instantaneous voltage versus current curves under different loading conditions, the hysteresis loops can be approximated to any desired degree of accuracy through a supervised training session.

从二种不同额定下所得的电压、电流瞬时值，透过监督式学习的过程，可以获得精确的变压器磁滞回路模型。

This paper sets up a kind of method to calculate the temperature field of the winding in large natural circulation power transformer with oriented cooling structure.

本文建立了一种能够计算大型自然油循环导向冷却结构变压器线圈温度场的方法。

This paper sets up the mathematic model of heat transfer and oil flow, and finishes the calculation of oil flow distribution and temperature field of winding in large natural oil circulation power transformer with oriented cooling structure.

本文建立了传热与流动数学模型，完成了大型自然油循环导向冷却方式变压器的油流分布和绕组温度场计算。

In addition, equivalent series reactance of excitation transformer worsens the condition of the thyristor operation, and it can bring transient over-voltage at the moment of switching thyristor. The transient over-voltage will endanger the field winding.

励磁变压器的串联电抗恶化了晶闸管的换相工作条件，并在晶闸管元件导通与关断瞬间引起危及到转子励磁绕组安全运行的过电压。

In the same time,main circuit figuration and working principle will be given,and worked out the parameter of this circuit S transformer and RCD clamped circuit.

给出了电路的主电路图，在此基础上阐述了此电路的工作原理，并分析计算出了变压器和RCD缓冲电路设计的参数。

A filter equipments design example base on the new HVDC system model was calculated in the last, the result of calculation and simulation indicate the theory of the new converter transformer is correct and the design of parameters are proper, the filters are effective, the total harmonic currents of the system is quiet low, It has a good application prospect.

最后针对具体的新型高压直流输电平台模型给出了滤波装置设计实例，分析仿真计算结果表明，本文提出的新型换流变压器原理正确，参数选择合理，滤波效果好，总谐波含量小，在谐波治理方面实现了新突破，具有良好的应用前景。

A wavelet-based digital filter is designed in this paper, and the applications of wavelet to the protection for transformer are discussed.

本文设计了以小波变换为基础的数字滤波器，对小波变换在微机变压器保护算法方面的应用进行了研究。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。