IL17569C
Page 8-14
FP-5000
Effective Date: 12/05
Page 8-14
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Effective Date: 12/05
The FP-5000 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 8.15
below).
Table 8.6 lists the relevant setpoints to the breaker fail functions see
programming Section 5.1.
Table 8.6 Breaker Failure Settings
Parameter
Range
Step
Breaker
Off, Int, Ext, Both
Failure
Configuration
BF Phase
0.1 to 5 x CT
0.01 x
Current
Rating, Disable
CT Rating
BF Ground
0.1 to 5 x CT
0.01 x
Current
Rating, Disable
CT Rating
Breaker
0 to 9999 Cycles
1 Cycle
Failure
Delay Time
Contact
BFI
Input X
Configuration
Output Gate Rly X
Trip, BF
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-
5000 close command is locked out until reset. Reset is accom-
plished 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-5000
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 8-15. Breaker Failure (Times in cycles unless stated otherwise)
