Schweitzer Engineering SEL-351P, Quick Start Manual

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Date Code 990430 Overcurrent, Voltage, Synchronism Check, and Frequency Elements i
SEL-351P Manual Técnico
TABLE OF CONTENTS
SECTION 3: OVERCURRENT, VOLTAGE, SYNCHRONISM
CHECK, AND FREQUENCY ELEMENTS...............................................3-1
Instantaneous/Definite-Time Overcurrent Elements ....................................................................3-1
Phase Instantaneous/Definite-Time Overcurrent Elements ..................................................3-1
Settings Ranges .............................................................................................................3-1
Accuracy .......................................................................................................................3-1
Pickup Operation...........................................................................................................3-3
Directional Control Option ...........................................................................................3-5
Torque Control..............................................................................................................3-5
Combined Single-Phase Instantaneous Overcurrent Elements .....................................3-6
Pickup and Reset Time Curves .....................................................................................3-6
Phase-to-Phase Instantaneous Overcurrent Elements ...........................................................3-7
Setting Range ................................................................................................................3-8
Accuracy .......................................................................................................................3-8
Pickup Operation...........................................................................................................3-8
Pickup and Reset Time Curves .....................................................................................3-8
Neutral Ground Instantaneous/Definite-Time Overcurrent Elements ..................................3-8
Settings Ranges ...........................................................................................................3-11
Accuracy .....................................................................................................................3-11
Pickup and Reset Time Curves ...................................................................................3-11
Residual Ground Instantaneous/Definite-Time Overcurrent Elements ..............................3-12
Settings Ranges ...........................................................................................................3-13
Accuracy .....................................................................................................................3-13
Pickup and Reset Time Curves ...................................................................................3-13
Negative-Sequence Instantaneous/Definite-Time Overcurrent Elements ..........................3-14
Settings Ranges ...........................................................................................................3-14
Accuracy .....................................................................................................................3-14
Pickup and Reset Time Curves ...................................................................................3-14
Time-Overcurrent Elements .......................................................................................................3-16
Phase Time-Overcurrent Elements .....................................................................................3-16
Settings Ranges ...........................................................................................................3-16
Accuracy .....................................................................................................................3-19
Logic Outputs (51P1T element example) ...................................................................3-19
Torque Control Switch Operation (51P1T element example) ....................................3-19
Torque Control Switch Closed............................................................................3-19
Torque Control Switch Open ..............................................................................3-20
Control of Logic Point TCP1 ..............................................................................3-20
Directional Control Option .................................................................................3-20
Torque Control ....................................................................................................3-21
Reset Timing Details (51P1T element example) ........................................................3-22
Setting 51P1RS = Y ............................................................................................3-22
Setting 51P1RS = N ............................................................................................3-22
Neutral Ground Time-Overcurrent Elements .....................................................................3-22
Settings Ranges ...........................................................................................................3-24
Accuracy .....................................................................................................................3-24