Schweitzer Engineering Laboratories SEL-351A - Figure 3.20 Residual-Ground Time-Overcurrent Element 51 G2 T (with Directional Control Option); Table 3.7 Residual-Ground Time-Overcurrent Element 51 G2 T Settings

3.25
Date Code 20080213 Instruction Manual SEL-351A Relay
Overcurrent, Voltage, Synchronism Check, and Frequency Elements
Time-Overcurrent Elements
q From Figure 4.17.
Figure 3.20 Residual-Ground Time-Overcurrent Element 51G2T (With
Directional Control Option)
Settings Ranges
2
See Section 9: Setting the Relay for additional time-overcurrent element
setting information.
51GRS electromechanical
reset timing
Y, N
51GTC SEL
OGIC control
equation torque
control setting
Relay Word bits referenced in Table 9.5 or set
directly to logical 1 (= 1)
a
a
SELOGIC control equation torque control setting (e.g., 51GTC) cannot be set directly to
logical 0.
Table 3.6 Residual-Ground Time-Overcurrent Element 51GT Settings
(Sheet 2 of 2)
Setting Definition Range
51G2P
(residual)
I
G
Setting
51G2TC
Torque Control Switch
Directional Control
(asserted to logical 1
continuously if E32 = N)
q
(Level 1)
SEL
OGIC
Torque Control
51G2T Residual Ground
Time-Overcurrent Element
Curve Timing and Reset Timing
Settings
51G2P Pickup
51G2C Curve Type
51G2TD Time Dial
51G2RS Electromechanical
Reset? (Y/N)
Pickup
Curve
Timeout
Reset
51G2
51G2R
51G2T
Torque Control
TCG2 State Switch Position
Logical 1 Closed
Logical 0 Open
Logic Point TCG2 Controls the Torque Control Switch
Setting
51G2RS = Reset Timing
Y Electromechanical
N 1 Cycle
TCG2
Relay
Word
Bits
SELOGIC
Setting
Table 3.7 Residual-Ground Time-Overcurrent Element 51G2T Settings
Setting Definition Range
51G2P pickup 0.10–16.00 A secondary
(5 A nominal phase current inputs, IA, IB, IC)
0.02–3.20 A secondary
(1 A nominal phase current inputs, IA, IB, IC)
51G2C curve type U1–U5 (US curves) see Figure 9.1–Figure 9.10
C1–C5 (IEC curves)
51G2TD time dial 0.50–15.00 (US curves) see Figure 9.1–Figure 9.10
0.05–1.00 (IEC curves)
51G2RS electromechanical
reset timing
Y, N
51G2TC SEL
OGIC control
equation torque
control setting
Relay Word bits referenced in Table 9.5 or set
directly to logical 1 (= 1)
a
a
SELOGIC control equation torque control setting (e.g., 51G2TC) cannot be set directly to
logical 0.
Courtesy of NationalSwitchgear.com