There are some geometry characters about it , for example , it is simple in structure , and the normal lines along generatrix line are in one plane , so there are the extensive applying prospects hi mechanical transmission and surface processing 此类曲面结构单纯，沿母线法线共面，并且有许多重要的几何性质，在机械传动和曲面加工中有着广泛的应用前景。
The directrixes of the in former two transmissions are the loxodrome and the geodesic on the pitch cones , that of the latter is an equal - pitch line along the direction of straight generatrixes in the hyperboloid surface , also is the vertical trajectory of the straight generatrixes 前两种传动形式的准线分别为节锥面上的斜航线与测地线，后者的准线为单叶双曲面上沿直母线方向的等螺距曲线，且为直母线族的正交轨线。
After electric heating system is installed , check electrical insulation of all circuits . the insulation resistance between generatrix and shielding layer , core wires of series cable before connection at end not be less than 20 m . and then check if dc resistance of circuit is normal and phase resistance is banlance 电伴热系统安装完工后，应逐路检查系统的绝缘电阻：各种电热带母线与屏蔽层之间、串联带芯线尾端末短接前的各芯线间绝缘电阻均应不小于20m ；然后再检查电热带直流电阻是否正常，三相电阻是否平衡。
Moreover , while changing link state of equipments between power line , generatrix , transformer and generator which are manipulated by jiangsu province ' s control center and bidding and retreating correlated relay protector and automatic safty safeguard , project company may obey related regulations of schedule discipline 项目公司在改变由江苏中调调度的线路、母线、变压器、发电机之间的设备连接状态和投退有关继电保护和安全自动装置时，应服从调度规程的有关规定。
Disigning coolant channel on the firebox of liquid rocket engine to loxodrome ( equal - angle helix ) groove can improve firebox coolant capability greatly . because the width dimension of loxodrome groove is narrow and the depth is deep , some machining methods are incapable , such as end - milling or electrochemistry . according to the peculiarities , a cnc disk - cutter - milling method which is composed of five motion axes with four simultaneously interpolated ones is researched . because most firebox generatrix is composed of complex curves , it is very difficult to get cnc cutting program with manual means . in order to deal with the problem , the loxodrome mathematics model is studied , and an auto - programming software system is developed . the software system can generate cnc cutting program of loxodrome on many kinds of turned surface . the constriction - distension segment of firebox is the most representative workpiece . the sharp changing of its generatrix slope makes loxodrome milling difficult . with the theory analyzing and practice cutting experiment , some applied techniques , which include milling mode and direction , choosing cutter diameter and cutting start point setting , are developed . adopting the technology above , tens regular workpiece have been manufacturing . the two - year manufacture practice has confirmed the validity and feasibility of developed loxodrome coolant channel milling method . the developed technology is also worth to be referenced to other similar workpiece 将液体火箭发动机燃烧室的冷却通道设计为斜航线(等倾角螺旋线)槽形,可以大幅度改善燃烧室的冷却性能.斜航线冷却槽的槽宽尺寸较小而槽深尺寸较大,所以无法使用棒铣刀铣削、电化学等加工方式.针对这些特点,提出了五轴控制、四轴联动的数控片铣刀铣削加工方法.由于燃烧室外表面的母线轮廓复杂,手工编制数控加工程序难度大.为了解决数控加工程序的编制问题,研究了斜航线的数学模型,开发了自动编程软件系统.使用该系统,可以生成多种母线轮廓回转体外表面上的斜航线数控加工程序.燃烧室收敛-扩张段的母线斜率变化大,加工难度大,是斜航线冷却通道加工的最典型工件.经过理论分析和实际切削实验,研究了针对该类型工件的片铣刀直径选择、铣削方式和方向、刀具调整和起刀点的设置等多项实际的加工方案.采用上述的一系列技术,已经成功地加工了数十个合格工件.经过两年多的实际生产过程应用,验证了所开发的斜航线冷却通道加工方法的正确性和可行性.这些加工技术的研制成功,对其他相似类型零件的加工亦具有参考意义
The mutual inductor of electric current and voltage mutual inductor play an important role in relay protection . prevent from ct differential to protect and miss movement an important subject that the generatrix is protected on the saturation , put forward two electric current pass zero hour linear to spread person who become put into differential to protect in ct in recent years , avoid ct saturation district , can judge the bus bar trouble correctly 但是在母线区外发生短路故障(特别是故障电流含有大量非周期分量)时， ct会出现饱和现象， ct饱和后，不能正确地传变一次侧电流，从而使二次电流发生严重畸变，产生很大的差电流，这样就容易引起误动作。防止ct饱和时差动保护误动作一直是母线保护的一个重要课题，近年来提出的在ct二次电流过零时的线性传变区投入差动保护，避开ct饱和区，能对母线故障做出正确判断。
I t owns international - advanced cross - linked cable production lines at rated voltage up to 500kv in the 1990 s , rubber cable line of 35kv , ship and mineral cable line , optical fiber cable for communication use and data cable line , extra - high voltage cable testing device , with which bare wires , electric power cable for electric equipment , power cable and distribution air reinforced insulated generatrix slot , 5 , 6 , and 7 data and digital cable with 6 classes , hundreds of series and tens of thousands of specifications 集团拥有国际90年代先进水平的500kv及以下8条交联电缆生产线， 35kv橡缆生产线、船用、矿用电缆生产线、光缆、数据缆生产线以及光缆、超高压电缆检测装置，能生产裸电线、电气装备电线电缆、电力电缆、配电类空气加强绝缘型母线槽， 5 、 6 、 7类数据缆、光缆共六大类、百余个系列、万余种规格的产品。
In this paper , it did simulation experiment and tested in the locale for quick - fuse , generatrix temperature and current - sharing coefficient . moreover , it did research on control arithmetic for temperature control system and did system simulation . and to discuss comparatively detailedly harmonic ' s produce , harm and restrain 本论文对快速熔断器、母线温度和均流系数进行了模拟实验和现场运行的测试，并且对温度控制系统进行了控制算法的研究和系统仿真，对谐波的产生、危害和抑制进行了比较详细地论述。
I t owns international - advanced cross - linked cable production lines at rated voltage up to 500kv in the 1990 s , rubber cable line of 35kv , ship and mineral cable line , optical fiber cable for communication use and data cable line , extra - high voltage cable testing device , with which bare wires , electric power cable for electric equipment , power cable and distribution air reinforced insulated generatrix slot , 5 , 6 , and 7 data and digital cable with 6 classes , hundreds of series and tens of thousands of specifications 集团拥有国际90年代先进水平的500kv及以下8条交联电缆生产线， 35kv橡缆生产线船用矿用电缆生产线光缆数据缆生产线以及光缆超高压电缆检测装置，能生产裸电线电气装备电线电缆电力电缆配电类空气加强绝缘型母线槽， 5 6 7类数据缆光缆共六大类百余个系列万余种规格的产品。
So it is worth to researching the problem that how to rationally distribute generatrix , vacuum interrupter and other electric organs to make the better insulation cooperation and the design requirement with the highly reliable insulation property so that we can assure that the metalclad withdraw switchgear run safely in the distribution system and have smaller installation space 因此如何能够合理的配置母线、真空断路器及其它电器元件，得到较佳的绝缘配合和设计要求，具有高度可靠的绝缘性能，保证中置柜在配电系统中安全运行，并且有较小的安装空间，是一个值得研究的问题。
