Tester

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  • Publicado : 4 de julio de 2010
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FACTS

BASIC

H V TESTING

ABOUT IGH OLTAGE

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Table of Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Types of Electrical Safety Tests . . . . . . . . . . . . . . . . . . . . . . . . . . .4 Safety AgencyRequirements . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 AC Voltage Withstand Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 Techniques of AC Hipot Testing . . . . . . . . . . . . . . . . . . . . . . . . . .8 Component Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 Transformer Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .10 Appliance Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 Motor Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 Indications of Unacceptable Performance: Breakdown . . . . . .16 Indications of Excessive Leakage Current . . . . . . . . . . . . . . . . .16 500 VA AC Hipot Testing . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . .17 DC Voltage Withstand Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 Techniques of DC Hipot Testing . . . . . . . . . . . . . . . . . . . . . . . .20 Indications of Unacceptable Performance: Breakdown . . . . . .20 Indications of Excessive Leakage Current . . . . . . . . . . . . . . . . .21 Battery Element Testers . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . .21 Recent Developments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23 Line and Load Regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24 No Load Setup of Trip Current and Voltage Output . . . . . . . . .25 Electronic Ramping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25 Software Calibration . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . .26 Automated Testing Armatures and Stators . . . . . . . . . . . . . . . .27 Recommended Test Schedule . . . . . . . . . . . . . . . . . . . . . . . . . .29 Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
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Introduction
High Voltage Testing has historically been the most misunderstood,misapplied, misinterpreted inspection function in the average manufacturing company. Some manufacturers have looked upon the high voltage test as an extra operation that must be performed to satisfy some safety agency standard. Though these safety agencies may have specified high voltage tests as a safety measure, their value as a quality control measure should not be overlooked. To help the manufacturerbetter understand this valuable feature, the first edition of “Basic Facts About High Voltage Testing” was written and published by Elmer Slaughter on January 18, 1957. Over the next 33 years Mr. Slaughter edited and added material he thought could serve to present basic information in a usable form to anyone concerned with this topic. Slaughter Company is pleased to present this NINTH edition toour valued customers. Additional sections have been added by planing various types of production tests along with their advantages and disadvantages. This was done to emphasize that most high voltage testing is carried out at the manufacturing level. The booklet has also been updated to reflect current instrumentation and technology. With more information on many of the current developments andchanges in high voltage testing. In addition, a resource section has been added so additional information can be readily obtained. Slaughter Company, Inc. January 2001

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Safety
Choose an area away from the mainstream of activity, where employees’ normal routines will not be interrupted. If this is impractical because of production line flow, clearly mark the area to keep away unauthorized...
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