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Discussion at Spring convention: Some fuel determinations made on locomotives operated by the Southern Pacific systems 春季会议上的讨论:对南太平洋系统运行的机车的一些燃料测定
Pub Date : 1923-11-01 DOI: 10.1109/JOAIEE.1923.6591535
Babcock
Cary T. Hutchinson: There are several deductions from the test data with which I am not in entire agreement. These concern the method of analyzing the data rather than the routine of the tests, of which I have no knowledge other than given in the paper. Using the data presented by the author, I am led to certain results which do not agree with his; possibly some of these can be charged to the small scale of the diagrams presented in the paper and others possibly to my failure to understand the method of presentation. It seems worth while to call attention to them, if only to bring out an explanation.
加里·t·哈钦森:从测试数据中得出的一些推论我并不完全同意。这些是关于分析数据的方法,而不是测试的程序,除了论文中给出的以外,我对这些问题一无所知。使用作者提供的数据,我得出了一些与他的不一致的结果;可能其中一些可以归咎于论文中呈现的图表规模小,而其他可能是由于我未能理解呈现方法。似乎值得引起人们的注意,哪怕只是为了给出一个解释。
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引用次数: 0
A method of calculating the ampere-turns for driving a magnetic flux through wedged-shaped teeth 一种计算驱动磁通量通过楔形齿的安培匝数的方法
Pub Date : 1923-11-01 DOI: 10.1109/JOAIEE.1923.6591531
Boris Worohoff
THERE are several methods of calculating the ampere-turns necessary to drive a certain magnetic flux through wedge-shaped teeth. Some of these methods give a very incorrect result, as, for instance, the method by the mean value of the sectional area of the tooth. A few other methods give a perfectly correct result, but require much time or special curves for every fixed form of tooth and a definite kind of material.
有几种方法可以计算驱动一定磁通量通过楔形齿所需的安匝数。其中有些方法给出的结果是非常不正确的,例如,用牙齿截面积的平均值来计算的方法。其他几种方法可以得到完全正确的结果,但对于每一种固定形状的牙齿和一种确定的材料,都需要花费大量的时间或特殊的曲线。
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引用次数: 0
The use of the scalar product of vectors in locus diagrams of electrical machinery 矢量标量积在电机轨迹图中的应用
Pub Date : 1923-11-01 DOI: 10.1109/JOAIEE.1923.6591533
V. Karapetoff
MOST engineers interested in alternating-current apparatus are familiar with the usual representation of currents and voltages by means of vectors. Such vector diagrams are in common use in the treatment of transmission lines, transformers, alternators, etc. When the performance of a machine, say of an induction motor, varies, due to a changing load, the end of the current vector describes a curve. When this curve can be predetermined, and especially when it is a circle, the study of the performance of that particular machine is much simplified and the electrical relationships are readily visualized. Such locus diagrams are used to a considerable extent for the induction motor and for certain types of alternating-current commutator motors.
大多数对交流设备感兴趣的工程师都熟悉用矢量表示电流和电压的常用方法。这种矢量图通常用于处理输电线路、变压器、交流发电机等。当一台机器的性能,比如一台感应电动机,由于负载的变化而发生变化时,电流矢量的末端描述了一条曲线。当这条曲线可以预先确定时,特别是当它是一个圆时,对特定机器性能的研究就会大大简化,而且电学关系也很容易可视化。这种轨迹图在很大程度上用于感应电动机和某些类型的交流换向器电动机。
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引用次数: 1
Cable geometry and the calculation of current-carrying capacity 电缆的几何形状及载流容量的计算
Pub Date : 1923-11-01 DOI: 10.1109/JOAIEE.1923.6591537
D. M. Simons
The main purpose of this article is to express the calculation of current-carrying capacity in simple formulas. The allowable current for underground cables is usually limited by the maximum permissible temperature of the insulation. The temperature rise is of course a function of the ability of the cable system to dissipate the heat generated. The chief difficulty in the calculation of current-carrying capacity is the determination of the thermal resistances of the path through which the heat must flow. The main part of this paper deals with the errors in the standard formulas for calculating the thermal resistance and geometric properties between the conductors and the sheath. A graphical method of correcting the errors is obtained in terms of what is called the “geometric factor,” the results are tabulated for 2, 3 and 4-conductor cables throughout the range of practical sizes and an empirical formula is given. The check between the results of the graphical correction method and the published experimental data on this subject is very satisfactory, and emphasizes the errors in the standard formulas. The thermal resistance between the sheath and the duct is mentioned briefly, and an approximate method of finding the resistance between the duct and the region at base temperature is outlined. The previous work is then combined into a simple formula giving the allowable current for n-conductor cables, there being any number of similar cables in the duct bank. The formula is also enlarged to cover the case of cables in the metric and square inch systems, and cables buried directly in the ground. The method of including the effect of induced sheath currents in single-conductor cables and of dielectric losses is shown. Finally, the procedure to use in case the cables in the duct bank are not all of the same type is outlined. In Appendix A the geometric factor for three-conductor cables under three-phase voltage is discussed, Russell's formula for this geometric factor being compared with the experimental determinations and an empirical formula for it is given. A formula is also given for the calculation of dielectric losses in three-conductor cables. The geometric factors for three-conductor cables in all other connections (i. e., the geometric factor for one conductor against the other two and sheath, or between any two conductors, etc.) are then derived in terms of the two geometric factors already obtained. In Appendix B are given examples of the calculation of current carrying capacity under various conditions, and of dielectric loss. In Appendix C an example is given which shows the error introduced by using an approximate formula for the calculation of the thermal resistivity of the insulation of a three-conductor cable based upon experimental measurements, the case taken up being a table in the Research on the Heating of Buried Cables.
本文的主要目的是用简单的公式来表示载流容量的计算。地下电缆的允许电流通常受绝缘的最高允许温度的限制。温升当然是电缆系统散热能力的一个函数。计算载流能力的主要困难是确定热必须流过的路径的热阻。本文的主要部分讨论了计算导体与护套之间的热阻和几何特性的标准公式中的误差。根据所谓的“几何因子”获得了一种校正误差的图形方法,将实际尺寸范围内的2、3和4芯电缆的结果制成表格,并给出了经验公式。图形校正方法的结果与已发表的实验数据的核对是令人满意的,并强调了标准公式中的误差。简要地提到了护套和风管之间的热阻,并概述了在基础温度下寻找风管和区域之间电阻的近似方法。然后将前面的工作结合成一个简单的公式,给出n导体电缆的允许电流,在管道堆中有任意数量的类似电缆。该公式也被扩大,以涵盖公制和平方英寸系统的电缆,以及直接埋在地下的电缆。给出了考虑单导体电缆中感应护套电流和介电损耗影响的方法。最后,程序使用的情况下,电缆在管道银行是不完全相同的类型概述。在附录A中讨论了三相电压下三芯电缆的几何因子,并将该几何因子的罗素公式与实验结果进行了比较,给出了经验公式。给出了三导体电缆介质损耗的计算公式。在所有其他连接中,三导体电缆的几何因子(即,一个导体对另两个导体和护套的几何因子,或任何两个导体之间的几何因子等),然后根据已经得到的两个几何因子导出。在附录B中给出了计算各种条件下载流能力和介质损耗的例子。在附录C中给出了一个例子,说明了在实验测量的基础上,用近似公式计算三芯电缆绝缘热电阻率所带来的误差,这个例子是《埋地电缆发热研究》中的一个表格。
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引用次数: 0
Education for the functional divisions of engineering 工程职能部门的教育
Pub Date : 1923-11-01 DOI: 10.1109/JOAIEE.1923.6591525
Edward Bennett
The functional divisions of engineering are considered to be those functional divisions found within the highly organized industrial organizations, — namely, research, design, supervision (of physical plant and of physical and chemical processes), management (of labor and business features) and engineering sales. To provide a background for the discussion of the proposed reorganization of the engineering courses along these functional lines, the features of the existing engineering courses are first presented and briefly discussed. It is pointed out that the existing courses, while intended to provide a broad foundation for engineering work in general, are each intended to provide a more thorough and specific foundation for work in some one of the industrial divisions of the engineering field. The grounds for selection between the existing engineering courses are then discussed. The question is discussed as to whether the student and his counselors would not be required to consider and to choose between the more basic types of engineering if each major engineering course were laid out to provide the best foundation for one of the functional divisions of the engineering field. The general features of the proposed functional courses are discussed and contrasted with those of the existing courses. The need for more than one type of treatment of many of the subjects is presented and the conclusion is drawn that the distinctive general feature of the functional engineering courses should be the separate provision for the needs of men of superior aptitude and for those of moderate aptitude by profoundly technical and moderately technical treatments of the different branches of science, particularly of the mathematics and physics of the first two years. The distinctive features of each of the functional engineering courses and the conditions of transfer from one to the other are discussed. The merits and possibilities of a method of determining the student's aptitude for the work in an engineering college before enrolling him in the college, by requiring him to report before the opening of the school year for a month of work and counsel with mature educators, are pointed out. The closing discussion relates to the relative parts played by survey courses and by profoundly technical courses in the development of clear, trustworthy breadth of vision.
工程的职能部门被认为是在高度组织化的工业组织中发现的那些职能部门,即研究、设计、监督(物理工厂和物理和化学过程)、管理(劳动力和业务特征)和工程销售。为了提供一个背景,讨论拟议的重组工程课程沿着这些功能线,现有的工程课程的特点,首先提出并简要讨论。有人指出,现有的课程虽然旨在为一般的工程工作提供广泛的基础,但每门课程都旨在为工程领域的某些工业部门的工作提供更彻底和具体的基础。然后讨论了在现有工程课程之间进行选择的理由。讨论的问题是,如果每门主要的工程课程都是为工程领域的一个功能部门提供最好的基础,那么学生和他的辅导员是否不需要考虑和选择更基本的工程类型。讨论了功能课程的总体特点,并与现有课程进行了对比。提出了对许多科目进行多种类型的处理的需要,并得出结论,功能工程课程的独特的一般特征应该是通过对不同科学分支,特别是前两年的数学和物理进行深刻的技术和中等技术处理,为具有优越能力的人和具有中等能力的人的需要提供单独的规定。讨论了各功能工程课程的特点,以及从一门课程转到另一门课程的条件。指出了在工程学院入学之前,要求学生在开学前报到一个月,并与成熟的教育工作者进行协商,以确定学生是否适合工作的方法的优点和可行性。最后的讨论涉及到调查课程和深度技术课程在发展清晰、可靠的视野广度方面所起的相关作用。
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引用次数: 0
Some problems in electric furnace operation: Improvements in ferro-alloy electric furnaces of high power input: Development of the large electric melting furnace 电炉运行中的一些问题:大功率输入铁合金电炉的改进;大型电熔炉的研制
Pub Date : 1923-11-01 DOI: 10.1109/JOAIEE.1923.6591536
Andreae, Saelatwalla, Anderson, Hodson
J. A. Seede: I remember distinctly a large smelting furnace making ferro-alloys in which the condition existed that Mr. Andreae points out, i.e., the charge surrounding the left hand electrode, looking at the furnace from the transformer, indicated that the temperature was too low to produce the required metallurgical action while the charge around the other electrodes indicated that the temperature was high and the metallurgical conditions satisfactory. Such unbalanced metallurgical conditions never produce satisfactory operation and no one had made, or has made to my knowledge, such a thorough analysis as the author has made in this paper.
J. a . Seede:我清楚地记得有一个大型冶炼铁合金的熔炉,Andreae先生指出的条件存在,也就是说,左边电极周围的电荷,从变压器看炉子,表明温度太低,无法产生所需的冶金作用,而其他电极周围的电荷表明温度很高,冶金条件令人满意。这种不平衡的冶金条件从来没有产生过令人满意的运行,而且据我所知,没有人做过或没有人做过作者在本文中所做的这样彻底的分析。
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引用次数: 0
Joseph Henry in the Hall of Fame 名人堂里的约瑟夫·亨利
Pub Date : 1923-11-01 DOI: 10.1109/JOAIEE.1923.6591549
J. Carty, J. Lieb, E. Rice, C. Skinner, L. F. Morehouse
Some time ago Joseph Henry was voted a place in the Hall of Fame, New York City, and a tablet was erected in his honor.
不久前,约瑟夫·亨利被选为纽约市名人堂的一员,并为他竖立了一块碑。
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引用次数: 0
Polyphase reaction synchronous motors 多相反应同步电动机
Pub Date : 1923-11-01 DOI: 10.1109/JOAIEE.1923.6591529
J. K. Kostko
THE reaction synchronous motor in its present form (salient-pole rotor without field coils) is one of the oldest types of electric motors, antedating the induction motor by many years. At first it was used only in connection with instruments, such as the oscillograph etc.; later its simplicity and exactness in keeping in step made it the standard driving motor for rectifying devices such as are used for charging low-voltage batteries, supplying high-tension unidirectional current for x-ray and electric precipitation apparatus etc., where the power may amount to several h. p. It is, however, safe to say that the limit of output of the present type is practically reached; its low weight efficiency and poor performance are inadmissible in motors of larger output and seem to justify the general opinion that the reaction motor is inherently inferior to the other types of a-c. motors.
目前形式的反式同步电动机(无磁场线圈的显著极转子)是最古老的电动机之一,比感应电动机早了许多年。起初,它只用于仪器,如示波器等;后来,它的简单和精确的同步使它成为用于给低压电池充电的整流装置的标准驱动电机,为x射线和电沉淀装置等提供高压单向电流,功率可达几马力。然而,可以肯定地说,目前的型号实际上已经达到了输出的极限。它的低重量效率和较差的性能是不可接受的电机较大的输出,似乎证明了一般的意见,即反应电机本质上不如其他类型的交流。马达。
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引用次数: 175
General considerations in grounding the neutral of power systems 电力系统中性点接地的一般考虑
Pub Date : 1923-10-01 DOI: 10.1109/JoAIEE.1923.6592188
H. Dewey
In the early days of power transmission, there was no consistent practise in respect to operating with neutral isolated or with neutral grounded. The rapid growth of transmission systems with their extensive networks soon began to show disastrous results from arcing grounds on isolated neutral systems and now most power transmissson networks have their neutrals grounded in some manner. The discussion of general considerations of neutral grounding is divided into two parts, that of overhead line systems and underground cable systems. He brings out the fact that while most overhead systems are grounded there is some difference in practise as to the extent to which they are grounded, that is as to whether they are grounded solidly or through resistance. Prevailing practise tends toward little or no resistance. Attention is called to different possible methods of grounding a system and shows by diagrams the flow of short-circuit current with the different methods. Underground cable systems are consistently operated with neutral grounded but general practise tends toward the use of resistance in neutral. General considerations as to protection from the voltage strains due to arcing grounds on cable systems are similar to overhead line systems and the author analyzes briefly the character of cable breakdowns and general effect of such breakdowns with a view to determining the importance of the extent to which a cable system should be grounded. The conclusion in regard to cable systems indicates about the same limitations as those found for overhead systems and no very good reasons are found for a distinctive difference in practise. The paper considers the use of grounding resistors of different types and gives some cast figures to show the effect of time and current in the design of metallic resistors. The general conclusion arrived at is that, on either overhead or underground transmission systems, high-voltage strains are more to be feared than high-current strains and that resistance to limit ground current, if used at all, should be of very low value.
在电力传输的早期,关于中性点隔离或中性点接地的操作没有一致的做法。随着输电系统的迅速发展和其广泛的网络,孤立中性点系统上的电弧接地很快就出现了灾难性的后果,现在大多数输电网络都以某种方式接地了中性点。中性点接地一般注意事项的讨论分为架空线路系统和地下电缆系统两部分。他指出,虽然大多数架空系统都是接地的,但在实践中,它们的接地程度存在一些差异,即它们是牢固接地还是通过电阻接地。普遍的做法倾向于很少或没有抵抗。注意系统接地的各种可能方法,并用图表表示短路电流在不同方法下的流动情况。地下电缆系统一贯使用中性点接地,但一般做法倾向于在中性点使用电阻。电缆系统对电弧接地引起的电压应变的保护的一般考虑与架空线路系统相似,作者简要分析了电缆故障的特征和故障的一般影响,以确定电缆系统应接地的程度的重要性。关于电缆系统的结论表明了与架空系统相同的局限性,并且在实践中没有找到明显差异的很好的理由。本文考虑了不同类型的接地电阻器的使用,并给出了一些模型来说明时间和电流对金属电阻器设计的影响。得出的一般结论是,无论是架空输电系统还是地下输电系统,高压应变比大电流应变更令人担忧,而限制接地电流的电阻,如果使用的话,应该是非常低的。
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引用次数: 0
Facts about Priest rapids: The largest possible hydroelectric development in the United States West of Niagara falls 关于普里斯特急流的事实:美国尼亚加拉大瀑布以西可能最大的水电开发项目
Pub Date : 1923-10-01 DOI: 10.1109/JOAIEE.1923.6592193
H. Pierce
THE Priest Rapids of the Columbia River are located a little south of almost the exact center of the State of Washington. The four principal cities of the far northwest — Portland, Seattle, Tacoma and Spokane — having an aggregate population of about 800,000, are each “as the crow flies” about 150 miles distant from Priest Rapids. The main lines of the Chicago, Milwaukee and St. Paul R. R. crosses the Columbia at Beverly, 14 miles above the foot of the Rapids. The Great Northern R. R. crosses the river at Trinidad, 40 miles north, and the Northern Pacific, the Union Pacific System and the Spokane, Portland & Seattle R. R. cross the river at Pasco, 60 miles south. A branch of the Milwaukee is now in operation along the River from Beverly, past Priest Rapids to Hanford, a distance of 40 miles. An extension of this line is projected north to Trinidad and south to Pasco which will give Priest Rapids the service of four of the great transcontinental railroads: The Great Northern, the Chicago, Milwaukee and St. Paul, the Northern Pacific and the Union Pacific System.
哥伦比亚河的祭司急流位于华盛顿州中心稍微偏南一点的地方。西北部的四个主要城市——波特兰、西雅图、塔科马和斯波坎——总人口约为80万,距离普雷斯皮兹市的直线距离约为150英里。芝加哥铁路、密尔沃基铁路和圣保罗铁路的主线在比佛利穿过哥伦比亚河,距离急流脚下14英里。大北方铁路在特立尼达以北40英里处穿过河流,而北太平洋、联合太平洋系统和斯波坎、波特兰和西雅图铁路在帕斯科以南60英里处穿过河流。密尔沃基的一个分支现在在贝弗利河沿岸运营,经过祭司急流到汉福德,距离40英里。这条线路的延长线将向北延伸至特立尼达,向南延伸至帕斯科,这将使普里斯特拉皮兹拥有四大横贯大陆的铁路:大北方铁路、芝加哥铁路、密尔沃基铁路和圣保罗铁路、北太平洋铁路和联合太平洋铁路系统。
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引用次数: 0
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Journal of the American Institute of Electrical Engineers
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