Schweitzer Engineering SEL-351P - Torque Control

Date Code 990430 Overcurrent, Voltage, Synchronism Check, and Frequency Elements 3-21
SEL-351P Manual Técnico
logic point TCP1 (and, thus, in the control of the Torque Control Switch and phase time-
overcurrent element 51P1T).
Torque Control
Refer to
Figure SECTION 3: .14.
SEL
OGIC Control Equation torque control settings (e.g., 51P1TC) cannot be set directly to
logical 0. The following are setting examples of SEL
OGIC Control Equation torque control
setting 51P1TC for phase time-overcurrent element 51P1T.
51P1TC = 1 Setting 51P1TC set directly to logical 1:
Then only the corresponding directional control input from
Figure 4.21 has to be considered in the control of logic point TCP1
(and, thus, in the control of the Torque Control Switch and phase
time-overcurrent element 51P1TC).
If directional control enable setting E32 = N, then logic point
TCP1 = logical 1 and, thus, the Torque Control Switch closes and
phase time-overcurrent element 51P1TC is enabled and
nondirectional.
Note: Some of the overcurrent element SEL
OGIC Control Equation torque
control settings are set directly to logical 1 (e.g., 51QTC = 1) for the
factory default settings. See SHO Command (Show/View Settings)
in Section 10: Serial Port Communications and Commands for a
list of the factory default settings.
51P1TC = IN105 Input IN105 deasserted (51P1TC = IN105 = logical 0):
Then logic point TCP1 = logical 0 and, thus, the Torque Control
Switch opens and phase time-overcurrent element 51P1T is defeated
and nonoperational, regardless of any other setting.
Input IN105 asserted (51P1TC = IN105 = logical 1):
Then only the corresponding directional control input from
Figure 4.21 has to be considered in the control of logic point TCP1
(and, thus, in the control of the Torque Control Switch and phase
time-overcurrent element 51P1T).
If directional control enable setting E32 = N, then logic point
TCP1 = logical 1 and, thus, the Torque Control Switch closes and
phase time-overcurrent element 51P1T is enabled and nondirectional.
Sometimes SEL
OGIC Control Equation torque control settings are set to provide directional
control. See Directional Control Provided by Torque Control Settings at the end of Section 4:
Loss-of-Potential, Load Encroachment, and Directional Element Logic.