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Unformatted text preview: (b) The shop owner would like to expand the services provided to customers. This requires adding two 50 HP motors that will run at rated load. One possibility is to use synchronous motors and run them at a 0.8 leading power factor. The synchronous motors are 94% efficient. Would the total load fit within the size of the existing service? SHOW ALL YOUR WORK!! syn acos F psyn ( 29-= syn 36.87-deg = S newmot S syn e j syn = S newmot 79.33 59.497i-kVA = So the total load is the old plus the new S tot S old S newmot + = S tot 245.83 91.839i + kVA = S tot 262.425kVA = The total load is 262.4 kVA, so the transformer is big enough! F ptot cos arg S tot ( 29 ( 29 = F ptot 0.937 =...
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This note was uploaded on 03/26/2012 for the course ECET 231 taught by Professor Piller during the Spring '12 term at Purdue University-West Lafayette.
- Spring '12