CHAPTER 9: THEORY OF OPERATION
PHASE DISTANCE APPLIED TO POWER TRANSFORMERS
D30 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
9-15
9
Equations from the “Current Transformation” and “Voltage Transformation” columns are used to derive inputs to the three
(AB, BC, and CA) phase distance elements. For example, if the CTs are located at the delta side of the Delta-Wye 11
transformer, and a given zone is set to look through the transformer into the system connected to the Wye winding, the CT
location setting for that zone is set to Dy11 and the relay uses
instead of a traditional I
A
- I
B
for the AB phase
distance element.
The current supervision pickup setting applies to the currents specified in the “Current Transformation” columns.
A distance zone originates at the location of the VTs (regardless of the location of the CTs). For information on settings see
the Application of Settings chapter.
9.2.2 Example
Consider the system shown.
Figure 9-5: Sample system configuration
Normally, in order to respond to the fault shown in the figure, a distance relay is applied at the relaying point X. The table
outlines the relay input signals at this location.
Table 9-10: Relay input signals at location X
Input
Primary
Secondary
VA
100.4 kV
∠
–7.32°
38.25 V
∠
–7.32°
Содержание D30 series
Страница 10: ...x D30 LINE DISTANCE PROTECTION SYSTEM INSTRUCTION MANUAL TABLE OF CONTENTS ...
Страница 14: ...1 4 D30 LINE DISTANCE PROTECTION SYSTEM INSTRUCTION MANUAL FOR FURTHER ASSISTANCE CHAPTER 1 INTRODUCTION 1 ...
Страница 52: ...2 38 D30 LINE DISTANCE PROTECTION SYSTEM INSTRUCTION MANUAL SPECIFICATIONS CHAPTER 2 PRODUCT DESCRIPTION 2 ...
Страница 534: ...5 324 D30 LINE DISTANCE PROTECTION SYSTEM INSTRUCTION MANUAL TESTING CHAPTER 5 SETTINGS 5 ...
Страница 564: ...6 30 D30 LINE DISTANCE PROTECTION SYSTEM INSTRUCTION MANUAL PRODUCT INFORMATION CHAPTER 6 ACTUAL VALUES 6 ...
Страница 578: ...7 14 D30 LINE DISTANCE PROTECTION SYSTEM INSTRUCTION MANUAL TARGETS MENU CHAPTER 7 COMMANDS AND TARGETS 7 ...
Страница 614: ...9 26 D30 LINE DISTANCE PROTECTION SYSTEM INSTRUCTION MANUAL FAULT LOCATOR CHAPTER 9 THEORY OF OPERATION 9 ...
Страница 654: ...A 10 D30 LINE DISTANCE PROTECTION SYSTEM INSTRUCTION MANUAL FLEXANALOG ITEMS APPENDIX A FLEXANALOG OPERANDS A ...
Страница 662: ...C 6 D30 LINE DISTANCE PROTECTION SYSTEM INSTRUCTION MANUAL COMMAND LINE INTERFACE APPENDIX C COMMAND LINE INTERFACE C ...
Страница 670: ...iv D30 LINE DISTANCE PROTECTION SYSTEM INSTRUCTION MANUAL ABBREVIATIONS ...
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