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IB02602004E
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Instructional Literature
Effective: May 2008
Page
97
Instructions for the FP-6000 Protective Relay
27A-1 Undervoltage
This is the 27 device Undervoltage setting for the Auxiliary VT.
This device setting works exactly the same as the 27-M1 device
above except it is a single-phase element only operating from
the Auxiliary VT input.
Note:
The expanded threshold V setting range (10–250V) is available for
the Auxiliary Undervoltage setting.
59A-1 Overvoltage
This is the 59 device Overvoltage setting for the Auxiliary VT. This
device setting works exactly the same as the 59M-1 device
above, except it is a single-phase element only operating from
the Auxiliary VT input.
Note:
The expanded threshold V setting range (10–250 V) isavailable for
the Auxiliary Overvoltage setting.
5.4.2.6 Power Protection Settings
32-1 and 32-2 Pwr
This is the 32-1 and 32-1 device Power Protection settings. This
function provides control or monitors the power flowing through
a feeder. Each power element can be configured as either
forward reverse or both and can operate based on either under
or over criterion. The overpower function can be used for a
conventional reverse power protection. The reverse power
protection is conventionally applied to a generator or a motor.
The under-power protection is mainly used to detect load loss or
generation loss. The FP-6000 includes two power trip units and
one alarm unit. The power threshold is compared against three
phase total real power. The breaker must be closed for these
functions to be effective. When the loss of potential block is set,
under-power protections will be disabled. The delay setting (0 to
65535 cycles in 1 cycle steps) is the time period a power
protection must occur before the FP-6000 initiates a trip.
5.4.2.7 Frequency Protection Settings
81U-1 Underfreq
This is the 81U device Underfrequency setting. This function
consists of a Threshold and Delay setting. The Threshold setting
is the frequency (45-65 Hz in 0.01 Hz steps) below which the
underfrequency function operates. The Delay setting (0 to 9999
cycles in 1-cycle steps) is the time period an underfrequency
must occur before the FP-6000 initiates a trip.
The underfrequency pickup and trip functions are reset when the
frequency raises above the underfrequency set threshold.
Note:
Phase A voltage must be greater than 10 V for this function to oper-
ate.
81O-1 Overfreq
This is the 81O device Overfrequency setting. This function
consists of a Threshold and Delay setting. The Threshold setting
is the frequency (45-65 Hz in 0.01 Hz steps) above which the
overfrequency function operates. The Delay setting (0 to 9999
cycles) is the time period an overfrequency must occur before
the FP-6000 initiates a trip.
The overfrequency pickup and trip functions are reset when the
frequency drops below the overfrequency set threshold.
Note:
Phase A voltage must be greater than 10 V for this function to oper-
ate.
5.4.2.8 Breaker Failure
50BF Bkr Config
This is the 50BF device Breaker Failure Configuration setting. The
50BF Bkr Config sets the conditions for the FP-6000 to detect a
breaker failure condition. This function is only activated after
initiation. The four 50BF Bkr Config setting descriptions are
shown below:
50BF Bkr Config set to Off
The 50BF device is turned off, so no breaker failure can be
detected internally or externally.
50BF Bkr Config set to Internal
The 50BF function will be initiated by an internal trip signal.
50BF Bkr Config set to External
The 50BF function will be initiated by an external signal.
50BF Bkr Config set to Both
The 50BF function will be initiated by either an internal or
external trip signal.
This includes the 50BF device Breaker Failure setting, which is
only applied if the 50BF Bkr Config setting is not set to “off.” The
default configuration for the output logic maps the Breaker
Failure trip (i.e. Breaker State Lockout) to output Relay 3 so that a
separate lockout relay (device 86) can be used to provide backup
tripping. The breaker failure function continues to monitor all
phase currents after a trip is initiated by either the FP-6000 or an
external device. The breaker failure trip output operates if the
phase or ground currents do not drop below the programmed
I Ph (pu) or I Gnd (pu) setting levels within the breaker failure
Delay time setting.
The I Ph (pu) is an independent overcurrent element monitoring
the phase currents. It is recommended to set the level above
maximum load currents even though the Breaker failure logic is
only initiated upon a breaker trip.
The I Gnd (pu) is an independent ground overcurrent element
that uses both the measured residual ground current (Ir) and the
measured ground current (Ix). It is recommended to be set
above any normal or expected rms ground currents.