10
PERFORMANCE SPECIFICATIONS
INSTANTANEOUS OVERCURRENT WITH
SETTABLE DELAY (50TP, 50TN)
Pickup:
5A CT
1ACT
0 .5 - 150 .0A
0.1
-
30.0A
PU time with TD=O. OOO Sec
Delay time:
Time Accuracy:
2 eye for P&G
@
5 x PU
3 eye for
N&Q @
5 x PU
0.000- 60 sec
±0.5% or±% eye for P
& N
±0.5% or ± 1 eye for
Q
TIME OVERCURRENT (51P, 51N, 151N)
Pickup:
5A CT
0.5
-
16.0A
1ACT
0.1 - 3.2 0A
Time dial: TD=K=O- 99 for 46 curve
TD=O. O- 9 .9 for all other curves
Time-Current Characteristics:
The following expression describes the inverse
time current characteristic for each curve:
TT
=
AD
+
B
D
+
K =Time to trip
MN-C
T
R
= RD
=
Time for decaying reset
M2- 1
where D = Time dial, M = Multiple of PU and A,
B,
C,
N,
K and R are constants that govern the shape
of each curve. The protection engineer can set the
constants for the P (programmable) curve to
achieve virtually any characteristic.
51P VOLTAGE CONTROL (27R)
Control Modes:
Uncontrolled, voltage
controlled, voltage restrained.
Control/Restraint Range:
30 -2 50V
Restrained Mode Characteristic: (see below)
100%-------------------------------
Cl
c
:g
75%------------------------
(/)
-
0
eft
c_
�
0
�c.
25%
50%
75%
vrestraint
% of setting
100%
Curve
Constants
Type
A
B
c
N
K
R
S1
0.2663 0.03393
1.000
1.2969
0.028
0.5000
S2
0.0286 0.02080
1.000
0.9844
0.028
0.0940
L1
5.6143 2.18592
1.000
1.000
0.028 15.750
L2
2.3955 0.00000
1.000
0.3125
0.028
7.8001
0.3022 0.12840
0.5000
0.028
1.7500
11
8.9341 0.17966
1.000
2.0938
0.028
9.0000
12
0.2747 0.1042
1.000
0.4375
0.028
0.8868
V1
5.4678 0.10814
1.000
2.0469
0.028
5.5000
V2
4.4309
0.0991
1.000
1.9531
0.028
5.8231
E1
7.7624 0.02758
1.000
2.0938
0.028
7.7500
E2
4.9883 0.0129
1.000
2.0469
0.028
4.7742
A
0.01414 0.00000
1.000
0.0200
0.028
2.0000
B
1.4636 0.00000
1.000
1.0469
0.028
3.2500
c
8.2506 0.00000
1.000
2.0469
0.028
8.0000
G
12.1212 0.00000
1.000
1.000
0.028 29.000
0.0000 1.00000
0.000
0.0000
0.028
1.0000
*
0
0
2
0.028
100
p
0 to 600 0 to 25
0 to 1
.5 to 2.5 0.028
0 to 30
51,52
=CO Short lnv, lAC Short lnv
L1, L2
=CO Long lnv, lAC Long lnv
D
= CO Definite Time
M
= CO Moderately Inverse
11, 12
= CO Inverse, lAC Inverse
V1, V2
=CO Very lnv, lAC Very lnv
E1, E2
= CO Ext Inverse, lAC Ext. Inverse
A= IEC Standard Inverse
B
= IEC Very Inverse
C
= IEC Extremely Inverse
G
= IEC Long Time Inverse
F = Fixed Time
46
= Negative Sequence Overcurrent
P
= Programmable
*
Constant A is variable for the
46
curve and is determined as necessary based on
generator full load current, minimum pickup, and
K
factor settings.
NEGATIVE SEQUENCE OVERCURRENT (46)
Pickup:
5A CT
0.1-16.0A
1A CT
0.02 -3.2 0A
Time dial: TD=K=O-99 for 46 curve
TD=O. O-9 .9 for all other curves
Time-Current
Characteristics:
Same curves as 51
elements
BREAKER FAILURE (BF)
Time:
50- 999 mSec
0.5A
Dropout:
5ACT
1ACT
Time Accuracy:
VOLTS/HZ (24)
Pickup:
Delay Time:
D
TT
=
{fifp
T
T
= Time to Trip
T R = Time to Reset
DT = Time Dial, Trip
0.1A
±0.5% or
+
11;4 eye
I -Yz
eye
0.5 - 6V/Hz
Inverse Squared Curve
ET
DR = Time Dial, Reset
Actual
M = Pickup V /Hz
ET = Elapsed Time
FST = Full Scale Trip Time (TT)
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