IB02602004E
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Instructional Literature
Effective: May 2008
Page
93
Instructions for the FP-6000 Protective Relay
The following settings will be needed for the thermal replica
model and a few settings are reserved for future use.
5.4.2. Protection Settings
The Protection Settings include all of the FP-6000 protective
device settings: 27, 46, 47, 50, 50BF, 51, 55A, 55D, 59, 81, zone
interlocking, power and protection alarm settings. The setting
descriptions below will follow the order of the setting table. The
FP-6000 may store four complete sets of Protection settings.
Table 11 lists only settings for 1 setting group. Multiple copies of
the Protection section from the table may be needed for a
complete record.
To navigate to the individual protection settings you must select
“Protection” from the Setting Main menu. If multiple setting
groups have been selected then you must select which
protection setting group you wish to set. You must now select
the protection elements that you want to set and enter down to
the set point page. To change an individual set point you must
select the setting, press the enter button and change the set point
to the desired setting. You must acknowledge the change by
pressing the enter button again to return to the previous level. If
you press the
Previous
button then the new setting will not be
changed.
5.4.2.1 Phase Overcurrent Settings
51P and 51P-2 PH TOC Curve:
These are the 51 device Phase Inverse Time Overcurrent Curve
Settings. The user selects the characteristic shape, the reset
characteristic of the TOC curve and the direction.
There are three families of TOC curves to choose from:
Thermal:
Flat, It, I
2
t, and I
4
t.
ANSI:
Extremely Inverse, Very Inverse, and Moderately Inverse.
IEC:
IEC-A, IEC-B, and IEC-C.
The TOC reset is a time overcurrent memory feature and has
three setting choices:
Inst:
Instantaneous reset: when the current drops below the pickup
setting, the TOC time resets to zero within 2 cycles.
T Delay:
Fixed time delay reset setting for the TOC curve. The time delay
is set to the
TOC Reset T
setting of the System Configuration
Settings. It will hold the time (“percent travel”), at the last value
before the current drops below pickup, for the set time (TOC
Reset T). If the current value goes above pickup before the reset
time has expired then the relay will begin to accumulate time
from its last value (percent travel).
“Percent Travel” refers to the percent of the time delay that the
timer has accumulated. The time overcurrent time is dynamic. If
the current changes it will change its trip times to the new value.
Total trip time will be the time at which the accumulator reaches
100%. For example, if the current is at level 1 for 40% of the total
trip time based on level 1 current then the accumulator will be at
40%. If the current now changes to level 2 with a new trip time,
then the remaining trip time will be 60% of the new trip time. So
the total trip time will be 40% of trip time t
1
plus 60% of trip time
t
2
. If the current was to drop below pickup for a time less than the
TOC Reset T in between level 1 and level 2 currents, then the total
trip time will include the time below pickup to the total trip time
calculated. This feature could be beneficial to tripping for an
arcing fault condition.
ThermI Type
This setting allows the user to select the type of
the effective heat current, RMS or I1+K*I2.
Therm Model
This setting is dependent upon the setting
ThermI Type. If RMS is selected, this setting
will be ignored. Otherwise, this setting allows
the user to select their own Multiplier K or the
one for MP-3000 motor relay.
I2 Multi K
This is the negative sequence current multiplier
K. It is dependent on the previous two settings.
If RMS or MP is selected, this setting will be
ignored. Otherwise, this setting allows the user
to select their own multiplier K.
FLA
Full Load Amperes (FLA).
LockRotor I
Locked Rotor Current (LRC) in terms of
percentage of FLA. (for example 1000%FLA or
10*FLA). If it is used for the power cable or
transformer other than motor or generator, it
should be the maximum through current.
MaxStall Tc
This is the Maximum Allowable Stall Time for
the motor at cold condition with the highest
heat current. This setting, along with LRC, is
used to determine the thermal capacity of the
protected equipment. The term Stall is
inherited from the motor relay. If it is used for
the power cable or transformer other than the
motor or generator, it should be the maximum
allowable time with the maximum through
current.
Service F
This is the Service Factor, which is the same as
Ultimate Trip Current in % FLA. If it is used for
the power cable or transformer other than the
motor or generator, it may be called the
Loading Factor.
Cooling Tc
Cooling Time Constant.
MaxTemp Trl
Maximum Temperature Rise Trl.
NormTempTro Normal Temperature Rise Tro.
Ambient
Normal Ambient Temperature Ta.
Speed2 FLA
Full Load Amperes, reserved for two speed
motor application.
Speed2 LRC
Locked Rotor Current (LRC), reserved for two
speed motor application.
SP2Stall Tc
Maximum Allowable Stall Time, reserved for
two speed motor application.
Speed2 SF
Service Factor, reserved for two speed motor
application.
Tc @80%V
Reserved. Maximum Cold Stall Time Tc at 80%
rated voltage.
MaxStall Th
Reserved. Maximum Hot Stall Time.
Motor MVA
Motor Capacity MVA.
Rated Volt
Motor Nameplate Voltage.
Rated pf
Reserved. Rated Power Factor.
Efficiency
Reserved. Rated Motor Efficiency (n).
Rr0
Reserved. Rotor resistance at rated motor
speed (R0).