Switching at richmond station

Abstract

formers stepping up to 27,600 volts. The size of generator selected for a sta tion must be determined by over-all eco nomics and an arbitrary upper limit within manufacturing limits can hardly be set. The size of machine is affected by rate of load growth as well as size of load. Some studies I made a few years ago indicate that one can frequently secure lower cost firm capacity by using relatively few large units even though this results in some excess in total kw capacity installed as compared with the use of smaller machines, and furthermore, this excess capacity soon be comes usable capacity in a growing system. I am entirely in sympathy with Mr. Sporn's objective of having Institute papers that give reasons for doing things rather than simply a description of what has been done. In reviewing my own paper I find that the explanations are not as clearly pointed out, and particularly the reasons back of the principles which are indicated as being controlling factors are not as well given as I intended in writing the paper. However, an author is limited by the very practical consideiation of space and the reader's patience, and the further difficulty of being able to distinguish between a rationalization of what has been done and the real motivating factors that governed when the design was prepared.