
49
MODE 6
Figure 57
– Selecting Input Mode 6
This choice monitors two Opening Coils, the 52a and 52b auxiliary switches. Mode 6 assumes that no connection to the Closing Coil
is possible. Because of this, Closing Time is not measured.
The first Opening Coil to be energized is identified. The Optimizer3 registers an Open operation and records the time duration of
the Opening Coil pulse. The start is the protective relay closing the trip circuit. The end is the opening of the 52A auxiliary switch,
modified by the A Input Delay, which begins the Contact Duty measurement. This time duration is named Opening Time, given in
milliseconds. The Opening Time measurement is modified by the A Input Delay.
The Opening Travel Time is defined by the time duration beginning with the falling edge of the Opening coil pulse (52a auxiliary
switch opening) and ending with 52b auxiliary switch closing. This segment of time is recorded and reported as Opening Travel
Time, given in milliseconds. Opening Travel Time is the actual measurement and is not modified by the A Input Delay.
When the 52b transitions from closed to open, the monitor registers a Close operation and records the time duration until the 52a
closes. This time duration is called Closing Travel Time, given in milliseconds.
NOTE
: Examples shown in the following diagrams (Figure 58).
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