Download or read book The Testing of Transformer Steel Classic Reprint written by M. G. Lloyd and published by Forgotten Books. This book was released on 2017-11-21 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from The Testing of Transformer Steel Consequently, methods of testing With alternating currents have come to be regarded as the only satisfactory way of making these measurements, and present efforts are directed to securing the best conditions for this form of test. In the wattmeter method, the electrical energy Which is supplied to maintain the alternating magnetization is measured With a wattmeter, While the maximum magnetic induction produced in the specimen is determined by a voltage measurement at the terminals of the magnetizing Winding or at the terminals of a secondary Winding placed around the same core of test material. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Download or read book The Testing of Transformer Steel written by Morton Githens Lloyd and published by . This book was released on 1909 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book TESTING POTENTIAL TRANSFORMERS CLASSIC REPRINT written by H. B. BROOKS and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Equipment for Testing Current Transformers Classic Reprint written by Francis B. Silsbee and published by Forgotten Books. This book was released on 2017-10-27 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Equipment for Testing Current Transformers The equipment and methods used for this purpose at the Bureau of Standards at Washington have been modified and enlarged from time to time to keep pace with the increasing demands in accuracy and range of the transformers to be tested. The object of this paper is to describe the equipment and methods 1 now in use at this Bureau in the hope that the data given may be of assistance to other labora tory workers who may wish to install apparatus for similar work. The accuracy needed in this class of testing should, if possible, be so high that errors in the certified values will be negligibly small in comparison with the inaccuracy likely to occur in the next step in the measurement process; that is, in the comparison in the field between the standard transformer and the working transformer. A limit to the possible accuracy is, of course, set by the repeatability of the transformer under test. This limit is influenced by a number of factors, among which are changes in the magnetic condition of the core as a result of previous operation, uncertainties in the temperature of the transformer windings and hence in their resistance, and uncer tainty in the exactness with which the burden used in the field is duplicated in the test. In the case of hole-type current transformers additional uncertainty arises because of differences in the position of [the primary conductor in the hole, and in the position of the return lead. The magnitude of the changes in calibration resulting from these effects depends greatly upon the type of transformer, but may amount to several tenths of 1 percent. The sensitivity of the present equipment is such that a change of percent in ratio and minute in phase angle is definitely detectable even at a secondary current as small as ampere. Changes in the performance of the transformer under test are there fore often noted. The accuracy of the equipment, since it involves the calibration of resistance standards of widely different values with the additional liability to errors from skin effect and residual self - induct ance, is, perhaps, not as high as the precision mentioned above would indicate. The accuracy limits printed on the Bureau's certificate form (viz, percent in ratio and 3 minutes in phase angle) are, however, certainly very conservative. In reducing the observed values all corrections are normally carried to the nearest percent and minute and the resulting values are then rounded off in the certificate to the nearest percent and 1 minute. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Download or read book METHOD FOR TESTING CURRENT TRANSFORMERS CLASSIC REPRINT written by FRANCIS B. SILSBEE and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transformer Practice written by William Thomas Taylor and published by Forgotten Books. This book was released on 2018-03-18 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Transformer Practice: Manufacture, Assembling, Connections, Operation and Testing The development of the alternating-current transformer dates back about 25 years. At that time very little was known re garding design for operation at high voltages, and the engineer of the present day can scarcely realize the difficulties encountered in the construction of the early transformers. The high-voltage transformer made long-distance trans mission work possible, and the increased distances of transmission stimulated the design of large transformers. In the early days of transformer development as many as 15 to 20 transformer secondary windings have been connected in series to facilitate the operation of a long-distance transmission system, the maxi mum rating of each transformer being not greater than 10 kw. However, a method of constructing large transformers has long been devised by which an enormous amount of power may be transformed in a single unit. Such designs embody principles of insulation for high voltages and various methods for maintain ing a low operating temperature. Ten years ago a 500-kilowatt unit was considered to be a large size of transformer. The history of ten years' development has shown a most interesting process of evolution: it has marked more than a tenfold increase in size up to the present day. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Download or read book The Principles of the Transformer Classic Reprint written by Frederick Bedell and published by Forgotten Books. This book was released on 2018-03-22 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from The Principles of the Transformer The author has received valuable assistance from Mr. H. L. Duncan, in the preparation of the chapter on transformer design, and from Mr. J. E. Boyd, in the preparation of the chapter on transformer testing. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Download or read book Construction of Apparatus for Testing Transformer Steel as Used by the U S Bureau of Standards written by Joāo Nunes Correia and published by . This book was released on 1916 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Abstract of Report on Tests of Double Galvanized Steel Strand and Iron Wire for Electrical Transmission and Distribution Classic Reprint written by Indiana Steel And Wire Company and published by Forgotten Books. This book was released on 2018-02-15 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Abstract of Report on Tests of Double Galvanized Steel Strand and Iron Wire for Electrical Transmission and Distribution Test Samples. The following sizes and grades of galvanized steel conductors were submitted by the Indiana Steel and Wire Co. For test. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Download or read book Calibration of Test Systems for Measuring Power Losses of Transformers Classic Reprint written by Oskars Petersons and published by Forgotten Books. This book was released on 2018-03-17 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Calibration of Test Systems for Measuring Power Losses of Transformers The use of the developed calibration instruments might be associated with hazardous voltages. The calibration instruments must be used in conformance with the applicable safety codes, standards, and practices. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Download or read book Transactions of the American Institute of Electrical Engineers written by and published by . This book was released on 1909 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the American Institute of Electrical Engineers written by American Institute of Electrical Engineers and published by . This book was released on 1909 with total page 1110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electrical Engineering written by and published by . This book was released on 1909 with total page 1078 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Tests of Centrifugally Cast Steel Classic Reprint written by George K. Burgess and published by Forgotten Books. This book was released on 2017-10-16 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Tests of Centrifugally Cast Steel The most serious of the low - carbon areas were found in castings Nos. 3a and 6_ (figs 7 and These areas are not completely eliminated by normalizing, and persist even after quenching and drawing, but have been almost completely eliminated by the double-quench and draw treatment. The normalizing treatment, for the most part, greatly refines the structures, while quenching and drawing produces a sorbitic structure with partially diffused ferrite. Structures after the double-quench and draw compare favorably with those of large heat-treated steel forgings. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Download or read book Laboratory and Factory Tests written by George F. Sever and published by Forgotten Books. This book was released on 2018-03-22 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Laboratory and Factory Tests: In Electrical Engineering Instruments should not be used in close proximity to dynamos, motors or conductors carrying large currents, for readings are affected by magnetic leakage from these sources, and the steel magnets in the instruments are liable to be permanently changed. A certain method of detecting this trouble is to note whether the instrument reads the same when it is turned around into different angular positions. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Download or read book A Handbook of Testing written by C. A. M. Smith and published by Forgotten Books. This book was released on 2018-03-09 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from A Handbook of Testing: Materials The properties of materials used by engineers vary owing to many causes. If we take a pound of almost any gas and measure its temperature, pressure, and volume, we can estimate with accuracy the behaviour of the gas, if it is to be compressed, under certain conditions, to a new pressure and volume. If, however, we take a pound of steel we cannot forecast with any accuracy the behaviour of the material under load if we know nothing more about it than the fact that it is called steel. It is of some assistance if we know the chemical. Composition of the steel, but, even with such information, we cannot estimate with accuracy the load which the material will carry at the point of fracture. Experience has taught engineers that the only satisfactory method of estimating suitable loads in design works is to subject samples of the actual material to be used, to tests, which reproduce, as nearly as is possible, the conditions met with in actual practice. Thus, if a quantity of steel is made for a purpose in which the material is subjected to a direct pull, the most satisfactory way of deciding the maximum value of the pull to be allowed in practice is to test samples of the material under similar conditions, and obtain a record of the physical properties of these samples. Of course it is possible that all of the steel from which the samples have been selected will not behave in a similar fashion to the specimens tested. In general, however, we can obtain suffi cient data to assist us to estimate with considerable certainty the safe loads to which the materials may be subjected. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Download or read book Transformers written by Caryl Davis Haskins and published by Forgotten Books. This book was released on 2015-07-14 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Transformers: Their Theory, Construction and Amplification, Simplified It has often been observed by almost every member of the electrical fraternity, that induction, and its out come, the transformer, is to the popular mind, the greatest mystery of the whole lighting system with which they come in contact. There is something tangible about the dynamo. Its movement, and the applied power are apparent. The lamp glows, and its action is appreciable, but the trans former remains to them an uncanny mystery. So too the average electrician whose training has long accustomed him to the management and applica tion of the electric current, finds in the transformer as a rule, more points regarding which his mind is hazy and uncertain, than in any other one piece of appara tus with which he has to deal. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
