计算电路

The paper makes an improvement on the circuit model of transformer in calculation of electromagnetic transients. Two conditions are investigated: exclusion of transformer magnetizing branch and inclusion of hysteresis curve of transformer magnetizing branch.

本文在电磁暂态计算中完善了变压器的电路模型，分析了在不考虑变压器励磁支路和考虑励磁支路的情况下线路合闸过电压水平计算值的差异，研究了合空变励磁涌流，最后对得出的计算结果进行了分析。

Based on a summary of main work in the field of analyzing impulse voltage distribution on normal transformer windings by computer over last several years, a new method for building up the equivalent circuit and calculating equivalent parameters of converter transformer is given in this paper. Meanwhile , a new method for calculating inductance parameters is given also .

本文在回顾总结国内外几十年来普通电力变压器波过程计算工作的基础上，从工程实际应用的观点出发，论述了换流变压器与普通的变压器在电磁性能、绝缘结构方面的不同之处，提出了换流变压器绕组波过程的等值电路和等值参数的计算方法，同时给出了一种新的电感参数的计算方法。

This paper has simply introduced the series resonance circuit principle of work and the electric circuit characteristic, and has used simulation teaching software Multisim carries on the analysis it.

本文简要地介绍了串联谐振电路工作原理和电路特点，并使用仿真教学软件Multisim对其进行分析，仿真结果与理论计算结果基本一致，说明了Multisim在电路分析教学中具有非常重要的意义。

The concerned research works of VFTO is investigated.A new transient circuit model to the question of the steep front and high amplitude value of VFTO is proposed based on general transient circuit model. The numeric simulation that disconnector switched off short bus has been proceeded by using above circuit model and the comparison of results with the one based on EMTP are given.

首先针对操作GIS中隔离开关所产生的快速暂态过电压上升时间短及幅值高的特点，在一般暂态电路模型的基础上提出了新的暂态电路模型，并利用该模型，对GIS中隔离开关切断短母线的等值电路进行了数值模拟，并与电磁暂态程序的计算结果进行了比较。

Point out among multistage amplifier reducing total noise directioning of coefficient , design one low in noise to setover the circuit, there is certain reference value to the design of the circuit amplifier.

指出在多级放大器中降低总噪声系数的方向，设计出了一种低噪声偏置电路，对电路放大器的设计有一定的参考价值。关键词：电子噪声，电路噪声，噪声计算

Secondly,the experimental equipment of electrical life of relay was developed and the arc erosion status of contact s of breaking the inductive load with the four circuits was researched by experiments.

论文首先构建了无保护电路和3种有保护电路模型并给出了电弧能量的计算公式；然后研发了继电器电寿命实验装置并通过实验研究了上述4种电路中继电器开断感性负载时触点的电弧侵蚀情况。

Firstly, the models of one unprotected circuit and three protected circuits were built and the formulas of arc energy for each circuit were given in this paper. Secondly, the experimental equipment of electrical life of relay was developed and the arc erosion status of contacts of breaking the inductive load with the four circuits was researched by experiments.

论文首先构建了无保护电路和3种有保护电路模型并给出了电弧能量的计算公式；然后研发了继电器电寿命实验装置并通过实验研究了上述4种电路中继电器开断感性负载时触点的电弧侵蚀情况。

Adopt the battery makes power supply, adopting the CMOS chip and liquid crystal display that the low 功 consume, taking place the machine usage LCD to flap,count to flap to concuss the machine CD4060 and double D to trigger the machine CD4013, counting a synchronous double of the machine adoption ten enter to make to count the machine CD4518, lock to save to translate the code machine is a CD4543, the whole telegram the electric circuit use CD4082, CD4011 and loudspeaker composings.

采用电池使力量供应，采用互补型金属氧化半导体薄片和液晶显示器低点消费，发生机器用法 LCD 拍打，计算拍打剧烈地震动机器 CD4060 和加倍 D 引起机器 CD4013，计算机器采用十的一个同时加倍进入制造计算机器采用十进入制造计算机器 CD4518，锁解救翻译密码机器是 CD4543，整个的电报电路使用 CD4082 、 CD4011 和喇叭筒构成。

Firstly, the realizable ways of signal detection and sample、 power circuit and the application of low-consumption model of MSP430 are discussed, by which the required function of current protection and voltage protection can be realized. Secondly, different protection algorithm based on micro-computer are discussed in this article, and from the virtues and defects of Fourier algorithm, an improved algorithm is put forward, and the importance of the improved algorithm is displaced. Thirdly, according to the national standard of GB/T18858 .3-2002, the principle of networklization of intelligence trip relay and how to realize it are mentioned. Lastly, using the current conditions, the test of precision is done. The experimental date present that the system is working well and can realize the real-time function of on-line detection.

首先在硬件设计上，对于信号检测、处理、电源电路、MSP430系列单片机的低功耗方式应用以及人机接口电路等问题提出了实现方法，基本实现了大范围电流、电压信号实时监控等功能；其次，本文还对当前各种微机保护算法进行了介绍，分析了傅立叶算法在实现智能脱扣器保护功能中的优缺点，并针对傅立叶算法中计算偏于复杂的问题对该算法进行了改进，提出了基于FFT的改进算法，通过算法的分析和比较，对改进算法的性能给出了评价；然后结合我国现场总线国家标准GB/T18858.3-2002讨论了DeviceNet现场总线在实现脱扣器网络化的原理，实现方法，论述了通讯接口电路的设计；最后利用现有条件，对装置进行了性能测试，试验数据说明系统工作状态较好，可以满足低压配电网自动化对低压脱扣器的各项要求。

The methods to achieving balanced current are presented and simulated in this paper. Thirdly, the snubbers are designed to compress the switching voltage transient. When IGBT is abruptly turned off, trapped energy in the circuit stray inductance is dissipated in IGBT, causing a voltage overshoot and damaging IGBT.

针对IGBT工作过程中出现的电压尖峰、电流尖峰和大的开关损耗问题，本文首先从理论上详细分析了IGBT逆变桥缓冲电路的工作原理，推导出缓冲电路各元件的参数计算公式，讨论了缓冲电路各元件参数对关断电压波形的影响并进行了仿真分析。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。