发电机

Based on varying process of generator terminal parameters after excitation fault, shortages of excitation protective principle of static stability boundary and asynchronous impedance boundary are analyzed. It proposed that excitation fault research relates to large-disturbance stability. Because dynamic power-angle character of generator after excitation fault is non-sinusoidal, there are differences between dynamic power-angle character and static state power-angle character. So it isn't ideal to protective operation result based on small-disturbance stability and static stability boundary criterion. At the same time, it proposed that asynchronous boundary impedance criterion is a constant reactive power circle moving adown j Xd′. It can ensure complete loss-of-excitation generator measuring impedance enter into the circle, but can't ensure the other condition measuring impedance including impossible losing synchronism enter. So loss-of-excitation protection would be maloperation when system voltage drops short and recovers or generator rejects load.③Based on stability principle, it puts forward setting conditions and calculation method of generator loss-of-excitation protection by direct measuring power-angle.

以励磁故障后发电机端的相关参数的变化为基础，通过对以静稳定边界和异步阻抗边界作判据的两类三种现行励磁保护在原理上存在的缺陷分析，发现：励磁故障是一个大干扰稳定性问题，励磁故障后的发电机的动态功角特性与静态功角特性有很大的差异，已远非正弦曲线，因此基于小干扰稳定性原理、以静稳定边界作判据的保护必然动作不理想；异步边界阻抗判据是一个下移j Xd′的等无功阻抗圆，它可以保证完全失磁后的发电机测量阻抗能进入该阻抗圆，但不能保证完全失磁之外的其它状态不会进入该阻抗圆，因此在系统电压短时下降或发电机突然甩负荷等情况下可能启动该保护使之误动。

In the paper,connection of bridge rectifier in rotor,arrangement of winding in the stator and the rotor,analysis of performance of the generator nonloaded and fully-loaded and design characteristic of the generator series are discussed respectively.Some considerable problems in design and m...

着重介绍了该发电机转子旋转整流电路的接线方式和定、转子绕组结构，分析了发电机在空载和负载2种情况下的运行特性以及该系列发电机的设计特点，指出了采用该励磁方式的单相交流同步发电机在设计和制造过程应注意的问题。

Hydrogen gas, as a refrigerant of the dynamotor, can increase the efficiency of generating electricity.

氢气作为发电机的冷却剂可以有效地提高其发电效率，而氢气参数处于正常范围内更是保证发电机高效、安全正常工作的必要条件，所以对发电机系统氢气参数的实时监测可以实现对发电机运行的必要而且有效的实时状态评估。

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 paper introduces the technologies of transformation from diesel engine to biogas-diesel double fuel engine and the design keys of the main component,and brings forward the technical measures of biogas purification and pipage which are more suitable for the engine,as well.

介绍了将畜禽场柴油发电机转换为沼气-柴油双燃料发电机的基本方法和关键部件的设计要点，提出了更符合内燃机燃烧特性的沼气净化与输配技术措施，使得沼气-柴油双燃料发电机在保持原柴油发电机使用特性的同时，大幅降低柴油的消耗量，取得良好的实际效果。

The ground faults in the generator stator and rotor are common and always the premonitory of the internal fault of generator, which may make great damage to the generator.

发电机定子、转子接地故障是发电机常见故障，而且往往是更为严重的发电机内部故障的先兆，严重威胁发电机的安全。

This will limit the operating range of the generators. Hence, this proposal aims to develop an innovative 「dual variable configuration」 generator which can be applied to wind power system. The feature of the proposed generator is such that its windings and air gap are regulable so that the characteristics can be regulated to cope with variable rotational speed operations and different turbine designs with a control algorithm applied.

因此，本计画旨在研发一创新双重变结构之发电机，并应用於风力发电系统，其特色为利用两种发电机变结构设计-亦即「绕组切换」与「调整气隙」，结合控制法则以即时调整发电机特性，使其适用於各种叶片设计以及各种转速下之操作，并使发电机输出得以始终运作於最大功率点。

For the purpose of this insurance a Steam Turbine Generator shall comprise the steam turbine and generator complete including exciter and generator cooling plant but not beyond the limits of the inlet steam stop-valve generator terminals or condenser steam inlet point.

为了本保险合同目的，一个蒸汽涡轮发电机包括蒸汽涡轮机、发电机，其中发电机包含励磁机和发电机制冷设备，但该机组以蒸汽进口截止阀、发电机接线柱或蒸汽冷凝器入口点为限。

according to the users′ actually demand for uninterruptible power supply for loads,the internal structure of digital generator is analysed and the reason for its uninterruptible function can′t be achieved.a design of the uninterrupted power supply system which transformed from the digital generator is proposed.the system uses the inverter of generators,ac through inverter for loads,at the same time,charges the battery as ac is normal.inverter the battery dc converters to ac for load,meanwhile,starting generator,when power failure.the system applies uninterruptible power for load,whether the ac is normal or abnormal,and design voltage and frequency stabilization,output zero-interrupted,battery charging and discharging management.without requiring purchase an uninterruptible power supply separately,this design can avoid duplication of investment and wasting of resources.

快速安全提高汽轮发电机转子检修质量。。。摘要：针对用户对负载供电不间断的实际需求，分析了数码发电机的内部结构及其不能实现供电的不间断性能的原因，提出一种由数码发电机改造组成的交流不间断供电系统的设计方法。该设计利用发电机内部的逆变器，在市电正常时，由市电经过逆变器给负载供电，同时给蓄电池充电；在市电断电时，一边启动发电机，一边由蓄电池的直流电通过逆变器转换成交流电供负载使用，实现无论市电正常还是异常，系统对负载提供不间断电源。设计对市电进行稳压、稳频、输出零切换、蓄电池的充放电管理等新功能。此设计无需单独购买不间断电源，避免重复投资和资源浪费。

In this paper,the development status of direct-driven variable-speed constant-frequency permanent magnet wind-power generators around the world was introduced.

介绍了国内外直驱变速恒频永磁风力发电机的发展应用状况，对发电机的结构、特点和转子磁钢进行了描述，针对它的特殊结构对其电磁系统设计方法及电力电子变换器进行了研究，最后指出了直驱变速恒频永磁风力发电机的发展趋势和研究方向，以期推进我国风力发电机的研究和应用。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。