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Instructional Literature
Page
160
Effective: May 2008
Instructions for the FP-6000 Protective Relay
For more information visit: www.eaton.com
IB02602004E
8.9.5 Breaker Failure (50BF)
The FP-6000 Breaker Failure function provides the option of local
tripping when a BFI Contact Input is detected and optional output
relay operation if local breaker failure is detected (see Figure 56).
Table 46 lists the relevant setpoints to the breaker fail functions
see programming Section 5.1.
Table 46. Breaker Failure Settings.
If the Breaker Failure Configuration is programmed to Off then no
Breaker Failure function is possible. The default configuration for
Breaker Failure Configuration is Off.
If the Breaker Failure Configuration is set to “Int”; if an IOC or
TOC phase, ground, or residual trip operation occurs; if after
Breaker Failure Delay Time cycles the current is above BF Phase
or BF Ground current limits — then the Breaker Failure (BF) Trip
indication is given as well as the Breaker Failure Lockout
indication. If BF Trip is true then a programmed contact output
relay will activate. By default Output Gate Relay 3 is programmed
for this function. When the Breaker Failure Lockout is true then
the FP-6000 close command is locked out until reset. Reset is
accomplished with a special reset command in the reset menu
different from the trip reset.
If the Breaker Failure Configuration is set to “Ext” and if a contact
input is configured to be “BFI” and is true, then a breaker failure
pickup initiates a trip operation without delay. If after Breaker
Failure Delay cycles, the current is above BF Phase or BF Ground
current limits, then the Breaker Failure (BF) Trip indication is
given along with the BF lockout indication. By default, contact
input 3 is configured to BFI. Reset is accomplished with a special
reset command in the reset menu different from the trip reset.
It can be seen that a downstream device might use the Breaker
Failure Configuration “Int” to issue a breaker failure event, and
use the “Ext” setting in an upstream breaker to immediately trip
upon downstream breaker failure.
If the Breaker Failure Configuration is set to “Both” then both
“Int” and “Ext” function operate independently as explained
above.
8.9.6 Breaker State Alarm
The Breaker State Alarm reports contact disagreement if both 52a
and 52b remain in the same state for more than 30 cycles. By
default, the alarm contact output relay will close.
8.9.7 Breaker Trouble
Any of the eight contact inputs (Cin1 – Cin8) can be configured as
Breaker Trouble. Contact input 4 is so configured by default. If
external logic determines that the breaker has failed in some way
then it can activate this contact input. If this input is true and the
FP-6000 gives the command to close the breaker then the closed
breaker command will be locked out until the signal goes to the
inactive state.
Figure 56. Breaker Failure (Times in Cycles Unless Stated Otherwise).
PARAMETER
RANGE
STEP
Breaker
Failure
Configuration
Off, Int, Ext, Both
BF Phase Current
0.02 to 5.00 x CT
Rating, Disable
0.01 x
CT Rating
BF Ground Current
0.02 to 5.00 x CT
Rating, Disable
0.01 x
CT Rating
Breaker
Failure
Delay Time
0 to 9999 Cycles
1 Cycle
Contact
Input X
Configuration
BFI
Output Gate Rly X
Trip, BF