母线

As is known to all,because of the physical factor,the quality of electric component(such as transformer, generatrix,cable,power capacitor and motor),and the factor of maintenance. The fact of short circuit and abnormal running of the power supply system is inevitable.

众所周知，由于自然条件、电气元件（如变压器、母线、电缆、电力电容器、电动机等）制造质量、运行维护诸方面因素，供电系统发生短路故障或异常运行状态是不可能完全避免的。

A novel hybrid diode-clamp cascade multilevel converter is presented in this paper. The new concept of the converter is based on connection of multiple diode-clamp converter modules with different dc bus voltages. Normally, the voltage blocking capability of faster devices such as IGBT and the switching speed of high voltage devices like GTO are found to be limited.

该文在研究传统的级联多电平、传统混合级联多电平以及二级管钳位级联多电平变换器的基础上提出了一种新型的混合二极管钳位级联多电平变换器，这种新型变换器是将具有不同直流母线电压的多个二极管钳位多电平变换器进行级联，输出电压是将这些变换器的输出电压进行矢量相加而合成的。

Using this method, wide dimming range can be achieved with narrow frequency range and constant DC link voltage. And the lamp current keeps perfect sine wave all the time, which means low lamp current crest factor is obtained. Its validity is verified by simulation and experiment.

本章最后提出了一种基于T型滤波器的新型的调光方法，采用此方法可以在保持逆变器直流母线电压和开关占空比不变的情况下，只需很窄的频率范围就能达到非常宽的调光范围，而且在整个调光范围内灯电流都基本上是完美的正弦波，这就意味着可以始终保持很低的灯电流波峰因数，仿真和实验结果充分验证了它的优点。

We calculate the lighting overvoltage of Ganzhou 500kV Substation by electromagnetic transient program. The results show that impulse-grounding resistance of towers before the Substation should be reduced to 7Ω and arrestors should be installed in two-group lines.

通过EMTP电磁暂态仿真程序对赣州500kV的雷电过电压水平进行了具体的计算分析，得出了该变电站终端塔接地电阻应减小至7Ω，并且两组母线均应装设避雷器的结论。

Short-circuit current secretly schemes against , system hits the target to the transformer substation when three-phase short circuit happened in the lower voltage grade bus bar one by one, the difference what be flowed past short-circuit current has been carried out secretly schemes against

短路电流计算，对变电站系统中的各个电压等级下的母线发生三相短路时，所流过的短路电流进行了分别计算。

This transformer substation is equipped with 2 main transformers, two group power source coils in, 35 kilovolts high-tension sides and 10 kilovolts high-tension sides use the single generatrix sectional type structure.

该变电站设有2台主变压器，两路电源进线，35千伏高压侧及10千伏高压侧均采用单母线分段式结构。

The main content has the bus, enters the going beyond a line, the circuit breaker, the isolator, as well as the electric current and the voltage transformer choice.

主要内容有母线、进出线、断路器、隔离开关、以及电流和电压互感器的选择等。

Project Content: The company plans to layout the production workshop according to modernized and high-efficiency standard, build "six lines and one network"(metal plate flexibility production line, bus bar processing line, sheet plate plastic spraying line, whole set pneumatic power assembling line, vacuum isolating breaker production line, 126kV～252kV SF6, GIS combined electrical apparatus production line and LAN of the factory) and put into a huge amount of capital for purchasing of various advanced testing and measuring equipment.

项目内容：公司计划按照现代化高效的标准布置生产车间，建好&六线一网&（即钣金柔性生产线、母线加工线、金属板材喷塑处理线、成套组装气动装配线、真空隔离断路器生产线、126千伏-252千伏级SF6、GIS组合电器生产线和工厂局域网）建设。并投入巨资配备了多种先进的检试、测量设备。

The direct measure mode is that Hall part is set into the interspace of loop winding or magnet coil, then the magnetism voltage difference or the current is measured.

直测式是将霍尔器件置于具有线圈绕组或直穿母线的环型铁磁体气隙中，测出气隙里的磁压降，即为被测电流。

One of, RHDHG series arc protection and created a domestic light, the low-voltage electric arc light protection precedent, to fill the domestic electric arc light at the time unable to protect the power bus of the blank, is now at more than 100 domestic substations, power plants, petrochemical and other high institutions to use more than 400 Units, the protection of the principle of new, faster removal of time to failure, fault location accuracy, user satisfaction high.

其中，RHDHG系列电弧光保护开创了国内中、低压电弧光保护的先河，填补了国内在电弧光发生时无法保护电力母线的空白，目前已在国内的100多个变电站、电厂、石化等企事业单位使用400多台，保护原理新颖，切除故障时间快，故障定位准确，用户满意度高。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。