9328900990 Rev L BE1-951 Protection and Control 4-79
The breaker control switch emulates a typical breaker control switch with a momentary close, spring
return, trip contact (Output 101T), a momentary close, spring return, close contact (Output 101C), and a
slip contact (Output 101SC). The slip contact output retains the status of the last control action. That is, it
is FALSE (open) in the after-trip state and TRUE (closed) in the after-close state.
Figure 4-74 shows the
state of the 101SC logic output with respect to the state of the 101T and 101C Outputs.
Figure 4-74. 101 Control Switch State Diagram
When the virtual control switch is controlled to trip, the 101T output pulses TRUE (closed) for
approximately 200 milliseconds and the 101SC output goes FALSE (open). When the virtual control
switch is controlled to close, the 101SC output pulses TRUE (closed). The status of the slip contact
output is saved to nonvolatile memory so that the relay will power up with the contact in the same state as
when the relay was powered down.
BESTlogic Settings for Virtual Breaker Control Switch
BESTlogic settings are made from the BESTlogic Function Element screen in BESTCOMS.
Figure 4-75
illustrates the BESTCOMS screen used to select BESTlogic settings for the Virtual Breaker Control 101
element. To open the BESTlogic Function Element screen for Virtual Breaker Control 101, select Virtual
Switches from the S
creens pull-down menu. Then select the BESTlogic button in for the 101 element.
Alternately, setting may be made using the SL-101 ASCII command.
Figure 4-75. BESTlogic Function Element Screen, 101
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