ece 447 lab manual HiDef

ece 447 lab manual HiDef - ECE 44 7 E l ectr i c Mac hin es...

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ECE 44 7 E l ectr i c Mac hin es La b oratory H a ndb ook Department of Electrical and Computer Engineering The Ohio State University 2015 Neil Avenue Columbus, OH 43210 Comments and suggestions regarding revisions to this manual should be sent to Prof. Kasten (kasten.l0;osu.edu) -- they will be appreciated . Last revised for Summer '07, dgk.
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Table of Contents topic page 1. Introduction 1 2. Safety 1 3. General Laboratory Equipment 5 4. Computer Data Acquisition System (CDAS) 11 5. General Experimental Procedure 16 6. Laboratory Reports 17 7. Laboratory Technique 18 Laboratory Experiments 20 General Schedule of Experiments 21 Exp. 1: Introduction to CDAS & Measurement Techniques 22 Exp. 2: Transformer Regulation and Equivalent Circuit 28 Exp. 3: DC Generator Saturation and Load Curves 33 Exp. 4: DC Motor Load Curves 37 Exp. 5: Synchronous Generator O.C. and S.C. Tests 41 Exp. 6: Induction Machine Operating Characteristics 47 Exp. 7: Synchronous Motor Load Tests 52
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EE 447 Machines Laboratory Handbook 1 1. Introduction The Electric Machines Laboratory in 071 Caldwell is equipped with a comprehensive array of machines and instrumentation systems. The student is provided with the opportunity to explore the construction and operation of transformers , DC machines , AC synchronous and induction machines , and dynamometers. The machines are supplied from an AC and DC power distribution system ; motor starters, resistor boxes, reactors , etc. are available to use in the experiments . Measurements of electric quantities are made using a modern Computer Data Acquisition System (CDAS). Also there is an extensive stock of analog instruments , current transformers , potential transformers and current shunts. To get the most from the laboratory experience , the student is urged to review this manual carefully. Considerations such as safety , equipment , and operation of CDAS, machinery fundamentals , laboratory technique , and proper report writing are covered. 2. Safety While the electrical laboratory is not a dangerous place, there are chances for electric shocks, or arc burns, if the student is careless. The following hazard sources can be defined: 1. AC Voltage (120, 240 V single and three phase) 2. DC Voltage (120V) 3. Arcs ( interrupting inductive loads) 4. Rotating Machinery 5. Hot Machinery The comments on the following pages will offer guidelines and rules to prevent injury and equipment damage. 2.1. What Happens When You are Shocked? When current is applied to the human body, the effect depends on the magnitude, frequency and duration of the exposure. Table 2.1 summarizes the effects. The Ohio State University Department of Electrical and Computer Engineering
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EE 447 Machines Laboratory Handbook 2 Table 2.1 60 Hz AC Current Effects on the Human Body Current (mA) Effect 0.2 Threshold of perception , startles a person 6 Let-go threshold for women. This is the current at which a measurable percentage of women could not let go of a conductor.
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