Instructional Literature
Page
100
Effective: May 2008
Instructions for the FP-6000 Protective Relay
For more information visit: www.eaton.com
IB02602004E
Figure 23. Sync-Check Characteristic.
period a Var protection must pickup before the FP-6000 initiates a
trip. The pickup and trip flags can be taken as inputs for the
programmable logic gates for control, protection, and alarm
applications. The pickup, dropout, and trip events of these Var
protections are logged in the event log and trip log; number of
Var trips is logged in the history log.
5.4.2.14 Thermal Protection (49DT and 49MT) Settings
The FP-6000 Relay provides one trip function (49DT) for each RTD
channel and one trip function for the thermal replica model. In
addition, there are two group trip protections that can be voted
as a combination of any RTD trips.
The RTD protections (49DT) are based on direct temperature
measurement and they are independent of the thermal model.
The settings for their pickup threshold should be based on the
recommended maximum insulation temperatures of the
protected equipment.
The thermal model protection (49M) has two thresholds: one is
the current threshold in a percentage of the full load ampere and
other is the thermal threshold based on the thermal capacity (TC)
which can be obtained with the settings Locked Rotor Current (I
LR
)
and Maximum Allowable Stall Time (T
LR
).
When any phase current exceeds the thermal model current
threshold, the thermal capacity used is incremented based on the
model. Otherwise, it is linearly decremented based on the
cooling constant (see Section 8.13 for more details).
Each of the 14 pickup and trip outputs can be programmed to any
of the programmable logic gates. The thermal protection pickup
and trip events are logged in the Event, Trip, and History logs,
and they can be viewed under the Status menu.
The thermal protection trip delays are in seconds.
+
-
-
+
+
-
+
-
|Va|
|Vb|
|Vc|
-
+
-
+
+
-
-
+
LBDL
DBLL
DBDL
A
B
C
AB
BC
CA
Va
Vab
Vb
Vbc
Vc
Vca
Voltage
Compensation
VL
|VL’|
+
-
-
+
ζ
=|VB
∠(
BCT+
ε)∗Δω−
VL’|
θ
=
∠
VB+(BCT+
ε)∗Δω − ∠
VL’
Δ
f=
Δθ
/2
πΔΤ
Δ
fmax
Δ
fmin
Δ
Vmax
θ
max
-
+
-
+
Synch Block
Synch enable
From Close Initiate
Wye or Delta
In-Synch
Ex
ternal By
-Pa
ss
Breaker Close Time
T2
0
Synch Fail
Synch Failure Timer
Slip Out of Range Alarm
Live Vmin
Dead Vmax
T1
0
T1
0
Voltage Dead Timer
+
-
+
-
-
+
-
+
+
-
+
-
+
-
+
-
|Va|
|Vb|
|Vc|
-
+
-
+
-
+
-
+
+
-
+
-
-
+
-
+
LBDL
DBLL
DBDL
A
B
C
AB
BC
CA
Va
Vab
Vb
Vbc
Vc
Vca
Vc
Vca
Voltage
Compensation
VL
|VL’|
+
-
+
-
-
+
-
+
ζ
=|VB
∠(
BCT+
ε)∗Δω−
VL’|
θ
=
∠
VB+(BCT+
ε)∗Δω − ∠
VL’
Δ
f=
Δθ
/2
πΔΤ
Δ
fmax
Δ
fmin
Δ
Vmax
θ
max
-
+
-
+
-
+
-
+
Synch Block
Synch enable
From Close Initiate
Wye or Delta
In-Synch
Ex
ternal By
-Pa
ss
Breaker Close Time
T2
0
T2
0
Synch Fail
Synch Failure Timer
Slip Out of Range Alarm
Live Vmin
Dead Vmax
T1
0
T1
0
T1
0
T1
0
Voltage Dead Timer
LR
LR
MAX
T
I
TC
2
2
.
1
