电源电阻

When 10（20）kV electrical source side neutral point adopts low-resistance grounding system,the existing problems of the high-voltage equipment protective grounding and low-voltage neutral point system grounding divided network settings in the distribution substations are analyzed.

摘要对 10（20）kV电源侧中性点采用小电阻接地系统的配电变电所中，高压设备的保护接地和低压中性点系统接地分网设置存在的问题进行了分析。

A small generator called a magneto is contained within the megohmmeter housings.themagneto furnishes the power for the instrument,just as batteries do for for an ohmmeter.the magneto can be hand powered or driven by batteries or other sources of electricity.megohmmeters have many different voltage ratings.some of the most common are designed to operate on oine of the following values:500V,1000V,and 10000V.the amount of volage the magneto should generate depends upon the ohmic value and the type ofresistance being measured.

兆欧计内置了一种小型磁发电机。磁发电机为兆欧计供电，就如同电池为欧姆计提供电力一样。磁发电机可以手摇，电池或者其他电源驱动。兆欧计有许多不同的电压等级。一些最常用的兆欧计电压为（原文此处有错，采用意译）：500伏，1000伏，和10000伏。磁发电机需产生的电压值取决于待测电阻值和电阻的类型。

The discharge scheme widely employed currently is the high voltage DC power which uses ballast resistor to restrict current and the typical electrical parameter scales are several kilovolt and hundred milliampere.

目前流行采用的是高压直流电源加镇流电阻的放电模式，典型电参数为接近10 kV 高电压、百毫安量级的低电流。

Disturbing Voltage is estimated equivalently according to the measurement of the typical numerical values between the leakage voltage and leakage resistance from the equipment of the oscillograph and the millivoltmeter based on the working frequency disturbance model.

在工频干扰模型基础上，通过对示波器和毫伏表的电源变压器漏电阻和等效漏电压典型值的测量，估算了工频干扰电压的幅度，从而说明电子测量系统各设备间共地连接的必要性，并介绍了共地方式在交流电桥等实践中的应用实例。

This paper shows the mathematic models and the calculation methods of the transient simulation in port equation form with full consideration of the periodic part and the nonperiodic part of the short circuit current and put the transformer, transmission line and the infinite power source in consideration. In resistance style fault it has perfect flexibility.

本文在充分考虑到短路电流的周期分量、非周期分量及带有变压器、线路和无穷大电源的情况下，给出了端口方程方法的机网暂态仿真研究数学模型和求解方法，结合电阻型故障模型，使故障仿真具有很强的灵活性。

To analyze the crosstalk and noise effect, the first step is to get the resistance, capacitance and inductance, which means the parasitical parameter extraction.

在分析电源网格受到串扰噪声影响时，首先需要尽量精确快速的根据几何尺寸提取电路参数电阻、电容、电感。

In the design of the power supply, the main circuit topology frame uses half-bridge series resonant switching and parallel load connection, in which, an IGBT is adopted as the power switches, and features high operation frequency, high output power and fast response. In addition, the IGBT in the switch mode power supply has no hard turn-on or turn –off situation in transition, thus the disturbance to the power system is avoided.

相应的激光电源采用半桥软开关技术，串联谐振并联输出，IGBT 为主控制元件，实现了高频工作、高功率多路输出，响应快速；脉冲模式工作时避免了开关管的硬开关，减小了高次谐波对电网的干扰；无需镇流电阻也可实现气体稳定放电等特性。

In the design of the power supply, the main circuit topology frame uses full-bridge series resonant switching and parallel load connection, in which, four MOSFETs are adopted as the power switches, and by four pulses which UC3879 produces, high frequency operation and fast response are realized. In addition, the MOSFET in the switching power supply has no hard turn-on or turn-off situation in transition, thus the disturbance to the power system is avoided. Especially,by the use of high frequency transformer, PQ50/50, the switching power system can provide the steady discharge current without any amperite.

此开关电源采用全桥软开关技术、串联谐振并联输出，四个MOSFET管为主控制开关元件，通过脉冲产生电路UC3879产生的四路相关脉冲实现了高频交替开关，同时能快速响应输出的各种变化；避免了开关管的硬开关，提高了转换效率，另外通过采用高频变压器PQ50/50隔离了原副边，减小了高次谐波对电网干扰；无需镇流电阻也可实现气体稳定放电。

If the built-in pull-up resistor is used, there is no problem when Hall IC use a 5V supply.

在使用内部上拉电阻时，Hall IC 使用 5V 的电源没有问题。

Lin Jingshan the company's Chief Engineer had personally on three of the heater heating method (commonly known as Little Miss Sunshine) to compare the speed of the hot and cold: The hand on heater in front of about 60 centimeters, to be followed by access to power: iodine-tungsten lamp quartz tube the thermal radiation immediately communicated to the hand; electric heating film about two to three seconds will be communicated to the hot hand; and the hot filament resistance will require more than 6 seconds.

该公司总工程师林景山曾亲自对三种加热方式的取暖器的冷热速度进行比较：将手放在取暖器前方60公分左右，然后依次接通电源：石英碘钨灯管的热辐射即时传达到手上；电加热膜约二、三秒钟将热传达到手上；而电阻丝加热的则需要6秒以上。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。