9328900990 Rev L BE1-951 Protection and Control 4-53
Table 4-31 summarizes the operating settings for Breaker Failure.
Table 4-31. Operating Settings for Breaker Failure
Setting Range Increment Unit of Measure Default
0 = Disabled N/A N/A
50 to 999 ms 1 ms Milliseconds
0.05 to 0.999 sec. 0.001 sec. Seconds
Time
0 to 59.96 (60 Hz) or 0 to 49.97 (50 Hz)
∗
Cycles
0
∗ Time delays less than 10 cycles can be entered to the nearest 0.1 cycles from the HMI. All time delays
can be entered to the nearest 0.01 cycles from the ASCII command interface. Time delays entered in
cycles are converted to milliseconds or seconds. Increment precision after conversion is limited to that
appropriate for each of those units of measure.
Example 1. Make the following operating settings to the Breaker Failure element. Refer to
Figure 4-43.
Timer Setting, Time: 10.02 cycles
Retrieving Breaker Failure Status from the Relay
The status of each logic variable can be determined from the ASCII command interface using the RG-
STAT (report general-status) or the RL (report logic) commands. Logic status cannot be determined using
BESTCOMS. See Section 6, Reporting and Alarm Functions, General Status Reporting, for more
information.
LOGIC TIMERS
62 - General Purpose Logic Timers
BE1-951 relays provide two general-purpose logic timers that are extremely versatile. Each can be set for
one of five modes of operation to emulate virtually any type of timer. Each function block has one output
(62 or 162) that is asserted when the timing criteria has been met according to the BESTlogic mode
setting.
Figure 4-44 shows the 62 function block as an example. Each mode of operation is described in
detail in the following paragraphs.
Figure 4-44. General Purpose Logic Timers Logic Block
An INITIATE logic input is provided to start the timing sequence.
A BLOCK logic input is provided to block operation of the timer. When this expression is TRUE, the
function is disabled.
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