
53
distance. The breaker instruction book will have information on the timing of the breaker operations.
Careful study of the Open and Close Illustrations shows the total contact stroke of 85 mm. The Optimizer3 begins the timer at the
start of the Opening Coil pulse. The 52a auxiliary switch opens at 11mS. The 52b auxiliary switch closes at 33 mS. The approximate
locations of 52A and 52B assertions are 128 mm and 43 mm, giving a stroke of 85 mm from 52A opening to 52B closing.
Figure 62
– Opening Travel Chart
Figure 63
– Close Travel Chart
For this breaker, the approximate value of 82 mm for stroke is used as a Configuration setting in the Optimizer3. This is the average
of the strokes found in the Opening and Close Travel Charts (85 mm + 79 mm)/2 = 82 mm.
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