Schweitzer Engineering SEL-351P - Section 3: Overcurrent, Voltage, Synchronism Check, and Frequency Elements;Section 3: Overcurrent, Voltage, Synchronism Check, and Frequency Elements

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