Date Code 20010515
Applications
5-27
SEL-2BFR, -2/BFR Instruction Manual
Figure 5.13: Single-Pole Instantaneous Retrip Using the A1, A2, and A3 Contacts
Loss-of-Potential Indication
In three-pole trip installations, the 47Q element asserts to indicate that a potential fuse has blown.
Set 47Q in a programmable output contact logic mask and monitor that contact externally using
an annunciator input, indicator lamp, or sequential events recorder input. When 47Q asserts, the
programmable output contact closes, indicating a blown potential fuse.
In single-pole trip installations, you may use the 47Q element in the same manner. However,
because the element may assert during single-pole-open intervals, you may want to use a time-
delayed pickup timer between the relay output contact and the annunciator input or indicator
lamp. The time delay should be set longer than the maximum single-pole-open interval. Thus,
only permanent output contact closures activate the annunciator.
Hot Resistor Indication
When you use the SEL-2BFR Relay breaker resistor thermal protection elements, you can set a
programmable output contact to close, indicating when one or more breaker resistor thermal
models contain energy above the pending failure or failure level.
Set a programmable output contact mask with the appropriate trip and close resistor thermal
failure or pending failure bits. The relay asserts the contact whenever the programmed bits assert.
You can monitor the contact using an annunciator input, indicator lamp, or sequential events
recorder input.
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