Schweitzer Engineering SEL-351P - Section 4: Loss-Of-Potential, Load Encroachment, and Directional Element Logic;Section 4: Loss-Of-Potential, Load Encroachment, and Directional Element Logic

Date Code 990430 Loss-of-Potential, Load Encroachment, and Directional Element Logic i
SEL-351P Manual Técnico
TABLE OF CONTENTS
SECTION 4: LOSS-OF-POTENTIAL, LOAD ENCROACHMENT,
AND DIRECTIONAL ELEMENT LOGIC..................................................
4-1
Loss-of-Potential Logic ................................................................................................................4-1
Setting ELOP = Y or Y1.......................................................................................................
4-2
Setting ELOP = Y.................................................................................................................
4-2
Setting ELOP = N.................................................................................................................
4-2
Load-Encroachment Logic............................................................................................................
4-3
Settings Ranges.....................................................................................................................
4-4
Load-Encroachment Setting Example ..................................................................................
4-4
Convert Maximum Loads to Equivalent Secondary Impedances .................................
4-4
Convert Power Factors to Equivalent Load Angles..............................................................
4-5
Apply Load-Encroachment Logic to a Phase Time-Overcurrent..................................
4-5
Use SEL-321 Relay Application Guide for the SEL-351P Recloser Control ......................
4-7
Directional Control for Neutral Ground and Residual Ground Overcurrent Elements................
4-7
Internal Enables ....................................................................................................................
4-8
Best Choice Ground Directional™ Logic ............................................................................
4-9
Directional Elements.............................................................................................................
4-9
Directional Element Routing ................................................................................................
4-9
Loss-of-Potential.........................................................................................................
4-10
Direction Forward/Reverse Logic.......................................................................................
4-10
Directional Control for Negative-Sequence and Phase Overcurrent Elements..........................
4-20
Internal Enables ..................................................................................................................
4-20
Directional Elements...........................................................................................................
4-21
Directional Element Routing ..............................................................................................
4-21
Loss-of-Potential.........................................................................................................
4-21
Direction Forward/Reverse Logic.......................................................................................
4-22
Directional Control Settings .......................................................................................................
4-27
Settings Made Automatically..............................................................................................
4-27
Settings................................................................................................................................
4-28
DIR1 – Level 1 Overcurrent Element Direction Setting.............................................
4-28
DIR2 – Level 2 Overcurrent Element Direction Setting.............................................
4-28
DIR3 – Level 3 Overcurrent Element Direction Setting.............................................
4-28
DIR4 – Level 4 Overcurrent Element Direction Setting.............................................
4-28
ORDER – Ground Directional Element Priority Setting............................................
4-29
50P32P – Phase Directional Element Three-Phase Current Pickup ...........................
4-30
Z2F – Forward Directional Z2 Threshold...................................................................
4-30
Z2R – Reverse Directional Z2 Threshold ...................................................................
4-30
Z2F and Z2R Set Automatically .........................................................................
4-30
50QFP – Forward Directional Negative-Sequence Current Pickup ...........................
4-31
50QRP – Reverse Directional Negative-Sequence Current Pickup............................
4-31
50QFP and 50QRP Set Automatically................................................................
4-31
a2 – Positive-Sequence Current Restraint Factor, I
2
/I
1
...............................................4-31
a2 Set Automatically ...........................................................................................
4-31
k2 – Zero-Sequence Current Restraint Factor, I
2
/I
0
....................................................4-32
k2 Set Automatically...........................................................................................
4-32