Circuit Breaker Time-Travel Test Analysis - Videos and Related Books
This 34-minute video explains how to analyze time-travel test recordings to obtain the breaker’s actual performance values for comparison with the breaker’s specifications.
Time-Travel Recordings – 11 minutes
Identifies the reference lines and traces on a recording from a drop-bar recorder. Identifies the reference lines and traces on a recording from a light-beam recorder. Identifies the reference lines and traces on a recording from a digital timer/analyzer. Briefly describes the performance report from a typical digital timer/analyzer.
Electrical Analysis – 6 minutes
Identifies the following electrical (time) characteristics of a breaker from time-travel recordings of the breaker: main contact and resistor contact break times, main contact and resistor contact make times, and contact synchronization.
Mechanical Analysis – 8 minutes
Identifies the following mechanical (travel) characteristics of a breaker from time-travel recordings of the breaker: stroke, overtravel, total travel, rebound, and contact wipe.
Velocities – 9 minutes
Describes arc zone, average velocity, and instantaneous velocity. Calculates average velocity using a travel trace from a time-travel recording. Determines average velocity using a velocity trace from a time-travel recording.
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This book reinforces learning from the video. It has informative text and color pictures throughout. Also a good resourse for learning on your own. A handy, compact book. Approximately 40 pages. More info