Instructional Literature
Page
158
Effective: May 2008
Instructions for the FP-6000 Protective Relay
For more information visit: www.eaton.com
IB02602004E
8.9 Breaker-Oriented Functions
8.9.1 Breaker State
Circuit breakers typically have both a 52a contact and a 52b
contact. The FP-6000 reports breaker state based on either one or
both of these inputs. It is recommended that both be used. When
both are used the FP-6000 can alarm if a conflict between the two
signals exists (see section 8.9.6 Breaker State Alarm). By default,
Contact Input 1 is configured as 52a and Contact Input 2 as 52b,
but any of the eight contact inputs can be configured as inputs to
read the 52a or 52b breaker contact outputs. Never configure
more than one input to be 52a or 52b (see Figure 53).
When the breaker is closed, the 52a breaker contact output is
closed and the 52b breaker output is open.
When the breaker is open, the 52a breaker contact output is open
and the 52b breaker output is closed.
The “Breaker Closed” and “Breaker Open” LEDs on the front face
panel are only operational if at least one contact input is
programmed to be 52a or 52b. The “Breaker Closed” LED will
light when the 52a contact input is on and/or the 52b contact is
off. The “Breaker Open” LED will light when the 52a contact input
is off and/or the 52b contact is on.
8.9.2 Close Breaker
The FP-6000 has been designed to issue a close breaker signal
from one of its programmable contact outputs. The default
configuration maps the Close Breaker function to contact output
relay 5 (see Figure 54). This relay can be made to operate for
45 line cycles when commanded, giving a pulsed on function.
The Close Breaker function can be initiated from four different
sources:
•
Front panel Close Breaker pushbutton, if enabled by System
Configuration “Bkr Operation PB” setting (see Section 5).
•
Test menu Close Breaker function.
•
Communication Close Breaker command, if enabled by
System Configuration “Remote Bkr” setting (see Section 5).
•
Contact input programmed to Remote Close.
By using the FP-6000 to close the breaker, the following
advantages of built-in logic are obtained:
•
Close signal is prevented after breaker failure (see 8.9.5 -
Breaker Failure).
•
Close signal is prevented while the FP-6000 Trip 1 output relay
is active.
•
Closed signal is prevented if the configured input Breaker
Trouble is active (see 8.9.7 - Breaker Trouble).
•
Closed signal is prevented if the breaker is already in the
closed state.
•
Closed signal is prevented if the open signal is being
requested.
•
A slow breaker alarm is raised if the breaker closes too slowly
(see 8.9.8 - Slow Breaker Alarm).
•
If the faceplate pushbutton is used, a warning message is
given if already in the closed state or a breaker state alarm
(see 8.9.6 - Breaker State Alarm) is active, or a slow breaker
alarm (see 8.9.8 - Slow Breaker Alarm) is active.
Figure 53. Breaker Monitoring (Times in Cycles Unless Stated Otherwise).
