Equipment For Testing Current Transformers Classic Reprint
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Equipment For Testing Current Transformers Classic Reprint
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Author : Francis B. Silsbee
language : en
Publisher: Forgotten Books
Release Date : 2017-10-27
Equipment For Testing Current Transformers Classic Reprint written by Francis B. Silsbee and has been published by Forgotten Books this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-10-27 with Technology & Engineering categories.
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.
Method For Testing Current Transformers Classic Reprint
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Author : FRANCIS B. SILSBEE
language : en
Publisher:
Release Date : 2022
Method For Testing Current Transformers Classic Reprint written by FRANCIS B. SILSBEE and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
Watthour Meter Method Of Testing Instrument Transformers Classic Reprint
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Author : PAUL GOUGH. AGNEW
language : en
Publisher:
Release Date : 2022
Watthour Meter Method Of Testing Instrument Transformers Classic Reprint written by PAUL GOUGH. AGNEW and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
The Testing Of Alternating Current Machines Vol 1
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Author : Charles Kinzbrunner
language : en
Publisher: Forgotten Books
Release Date : 2017-10-19
The Testing Of Alternating Current Machines Vol 1 written by Charles Kinzbrunner and has been published by Forgotten Books this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-10-19 with Technology & Engineering categories.
Excerpt from The Testing of Alternating Current Machines, Vol. 1: In Laboratories and Test-Rooms; A Practical Work for Students and Engineers; General Tests; Transformers; Alternators This volume follows the general scheme of the Author's book on The Testing of Continuous Current Machines (harper Brothers. 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.
Calibration Of Test Systems For Measuring Power Losses Of Transformers Classic Reprint
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Author : Oskars Petersons
language : en
Publisher: Forgotten Books
Release Date : 2018-03-17
Calibration Of Test Systems For Measuring Power Losses Of Transformers Classic Reprint written by Oskars Petersons and has been published by Forgotten Books this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-03-17 with Technology & Engineering categories.
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.
Instrument Transformers
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Author : P. k. Pattanaik
language : en
Publisher: MJP Publisher
Release Date : 2019-06-04
Instrument Transformers written by P. k. Pattanaik and has been published by MJP Publisher this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-06-04 with Technology & Engineering categories.
1. Introduction, 2. Studies on Current Transformer, 3. Studies on Capacitive Voltage Transformer, 4. Data on Electrical System
Current Transformer Test Equipment
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Author : M. M. Abdul Majid
language : en
Publisher:
Release Date : 1987
Current Transformer Test Equipment written by M. M. Abdul Majid and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Electric transformers categories.
The Testing Of Transformer Steel Classic Reprint
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Author : M. G. Lloyd
language : en
Publisher: Forgotten Books
Release Date : 2017-11-21
The Testing Of Transformer Steel Classic Reprint written by M. G. Lloyd and has been published by Forgotten Books this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-11-21 with Technology & Engineering categories.
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.
Testing Potential Transformers Classic Reprint
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Author : H. B. BROOKS
language : en
Publisher:
Release Date : 2022
Testing Potential Transformers Classic Reprint written by H. B. BROOKS and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
Numerical Differential Protection
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Author : Gerhard Ziegler
language : en
Publisher: John Wiley & Sons
Release Date : 2012-01-27
Numerical Differential Protection written by Gerhard Ziegler and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-01-27 with Technology & Engineering categories.
Differential protection is a fast and selective method of protection against short-circuits. It is applied in many variants for electrical machines, trans-formers, busbars, and electric lines. Initially this book covers the theory and fundamentals of analog and numerical differential protection. Current transformers are treated in detail including transient behaviour, impact on protection performance, and practical dimensioning. An extended chapter is dedicated to signal transmission for line protection, in particular, modern digital communication and GPS timing. The emphasis is then placed on the different variants of differential protection and their practical application illustrated by concrete examples. This is completed by recommendations for commissioning, testing and maintenance. Finally the design and management of modern differential protection is explained by means of the latest Siemens SIPROTEC relay series. As a textbook and standard work in one, this book covers all topics, which have to be paid attention to for planning, designing, configuring and applying differential protection systems. The book is aimed at students and engineers who wish to familiarise themselves with the subject of differential protection, as well as the experienced user entering the area of numerical differential protection. Furthermore, it serves as a reference guide for solving application problems. For the new edition all contents have been revised, extended and updated to the latest state-of-the-art of protective relaying.