3-26 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements Date Code 20001006
SEL-351 Instruction Manual
Figure 3.19: Residual Ground Time-Overcurrent Element 51GT (With Directional Control
Option)
Settings Ranges
Table 3.5: Residual Ground Time-Overcurrent Element Settings
Setting Definition Range
51GP pickup 0.50 - 16.00 A secondary (5 A nominal phase current
inputs, IA, IB, IC)
0.10 - 3.20 A secondary (1 A nominal phase current
inputs, IA, IB, IC)
51GC curve type U1 - U5 (US curves) see Figure 9.1 - Figure 9.10
C1 - C5 (IEC curves)
51GTD time dial 0.50 - 15.00 (US curves) see Figure 9.1 - Figure 9.10
0.05 - 1.00 (IEC curves)
51GRS electromechanical
reset timing
Y, N
51GTC SELOGIC Control
Equation torque
control setting
Relay Word bits referenced in Table 9.3
or
set directly to logical 1 (= 1) or logical 0 (= 0) - see note
below
Note: If SELOGIC Control Equation torque control setting 51GTC is set directly to logical 0 (i.e.,
51GTC = 0), then corresponding residual ground time-overcurrent element 51GT is
defeated and nonoperational, regardless of any other setting.
Courtesy of NationalSwitchgear.com
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