Schweitzer Engineering SEL-351P, Быстрый старт

Страница: 219 / 674

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