Excerpt from Characteristics and Limitations of the Series TransformerThere are certain facts about the series transformer which are gen erally known among men who have anything at all to do with it. It is known that the series transformer consists of two coils metallically sep arate, wound on a laminated iron core that the coil connected in the line generally has fewer turns than the secondary coil across which the instruments are connected, and that the ratio of the turns is about in inverse proportion to the ratio of the currents. It is known that it is dangerous to leave the secondary open-circuited because if a current ¿ows in the primary, high voltages will be induced in the open-circuited secondary and there will be high heating of the iron core which may cause disaster. It is also known that slight variations in secondary load (or resistance and reactance) do not change the transformation ratio to a very great extent, and that the ratio is nearly constant for all values of primary current within a given range. It is also known that when used in connection with wattmeters annoyance is often caused by a cer tain angle of phase displacement from the ideal position. These very nearly constant factors, however, such as current ratio and phase angle, are very often subject to great variations, and in the following discussion it is proposed to investigate the relations between these factors and the constants of the transformer and load, to determine how and to what extent they are in¿uenced by these constants.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.