Date Code 20011112
Line Current Differential, Distance, Out-of-Step, Overcurrent,
3-55
Voltage, Synchronism Check, and Frequency Elements
SEL-311L Instruction Manual
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.2
2
3
4
5
6
7
8
9
10
Applied Current (Multiples of Pickup Setting)
Pi
ck
up
T
ime
(C
ycle
s)
Maximum
Minimum
M311L099
Figure 3.43: SEL-311L Relay Nondirectional Instantaneous Overcurrent Element Pickup
Time Curve
M311L100
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
1.2
2
3
4
5
6
7
8
9
10
Applied Current (Multiples of Pickup Setting)
Reset
Time
(Cyc
le
s)
Maximum
Minimum
Figure 3.44: SEL-311L Relay Nondirectional Instantaneous Overcurrent Element Reset
Time Curve
Residual Ground Instantaneous/Definite-Time Overcurrent Elements
Four levels of residual ground instantaneous/definite-time overcurrent elements are available.
The different levels are enabled with the E50G enable setting, as shown in Figure 3.45.
All residual ground instantaneous/definite-time overcurrent elements are available for use in any
user-defined tripping or control scheme.
To understand the operation of Figure 3.45, follow the explanation given for Figure 3.42 in the
preceding
Phase Instantaneous/Definite-Time Overcurrent Elements
subsection, substituting
residual ground current I
G
(I
G
= 3I
0
= I
A
+ I
B
+ I
C
) for phase currents and substituting like settings
and Relay Word bits.
In Figure 3.45 Levels 1 and 2 67G
n
elements have their directional control fixed forward. Levels
3 and 4 have selectable forward and reverse directional controls. See Figure 4.12 in
Section 4:
Loss-of-Potential, CCVT Transient Detection, Load-Encroachment, and Directional Element
Logic
for more information on directional control.
Summary of Contents for SEL-311L
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