5-296
L30 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
CONTROL ELEMENTS
CHAPTER 5: SETTINGS
5
INCIPNT FLT 1 MODE
— There are two modes of operation available for the incipient cable fault detector element. In the
“Number of counts” mode, a trip is initiated only after the selected number of faults is detected. In the “Counts per window”
mode, a trip is initiated only after the selected number of faults is detected within the time specified by the
INCIPNT FLT 1
DETECT WINDOW
setting.
INCIPIENT FLT 1 TRIP COUNTS NUMBER
— Selects the number of faults required to initiate a trip.
INCIPNT FLT 1 DETECT WINDOW
— Specifies a time window for “Counts per window” mode of operation.
INCIPIENT FAULT 1 RESET DELAY
— Specifies a reset time for the output after the trip is initiated.
Figure 5-158: Incipient cable fault detector logic
5.8.11.5 VT fuse failure
SETTINGS
CONTROL ELEMENTS
MONITORING ELEMENTS
VT FUSE FAILURE 1(2)
Every signal source includes a fuse failure scheme.
The VT fuse failure detector is used to raise an alarm and/or block elements that operate incorrectly for a full or partial loss
of AC potential caused by one or more blown fuses. Some elements that can be blocked (via the BLOCK input) are distance,
voltage restrained overcurrent, and directional current.
There are two classes of fuse failure that occur:
•
Class A — Loss of one or two phases
•
Class B — Loss of all three phases
Different means of detection are required for each class. An indication of class A failures is a significant level of negative-
sequence voltage, whereas an indication of class B failures is when positive sequence current is present and there is an
insignificant amount of positive sequence voltage. Also, a rapid decrease in the phase voltages magnitude from a healthy
VT FUSE FAILURE 1
VT FUSE FAILURE 1
FUNCTION: Disabled
Range: Disabled, Enabled
VT FUSE FAILURE 1
ALARM DELAY: 1.000 s
Range: 0.000 to 65.535 s in steps of 0.001
NEUTRAL WIRE OPEN 1
DETECTION: Disabled
Range: Disabled, Enabled
NEUTRAL WIRE OPEN 1
3 HARM PKP: 0.100 pu
Range: 0.004 to 3.000 pu in steps of 0.001
Содержание L30
Страница 10: ...x L30 LINE CURRENT DIFFERENTIAL SYSTEM INSTRUCTION MANUAL TABLE OF CONTENTS ...
Страница 14: ...1 4 L30 LINE CURRENT DIFFERENTIAL SYSTEM INSTRUCTION MANUAL FOR FURTHER ASSISTANCE CHAPTER 1 INTRODUCTION 1 ...
Страница 126: ...3 68 L30 LINE CURRENT DIFFERENTIAL SYSTEM INSTRUCTION MANUAL CONNECT TO D400 GATEWAY CHAPTER 3 INSTALLATION 3 ...
Страница 214: ...4 88 L30 LINE CURRENT DIFFERENTIAL SYSTEM INSTRUCTION MANUAL FLEXLOGIC DESIGN USING ENGINEER CHAPTER 4 INTERFACES 4 ...
Страница 582: ...7 16 L30 LINE CURRENT DIFFERENTIAL SYSTEM INSTRUCTION MANUAL TARGETS MENU CHAPTER 7 COMMANDS AND TARGETS 7 ...
Страница 598: ...9 6 L30 LINE CURRENT DIFFERENTIAL SYSTEM INSTRUCTION MANUAL TESTING CHAPTER 9 COMMISSIONING 9 ...
Страница 622: ...10 24 L30 LINE CURRENT DIFFERENTIAL SYSTEM INSTRUCTION MANUAL FAULT LOCATOR CHAPTER 10 THEORY OF OPERATION 10 ...
Страница 670: ...A 18 L30 LINE CURRENT DIFFERENTIAL SYSTEM INSTRUCTION MANUAL FLEXANALOG ITEMS APPENDIX A FLEXANALOG OPERANDS A ...
Страница 678: ...C 6 L30 LINE CURRENT DIFFERENTIAL SYSTEM INSTRUCTION MANUAL COMMAND LINE INTERFACE APPENDIX C COMMAND LINE INTERFACE C ...
Страница 682: ...D 4 L30 LINE CURRENT DIFFERENTIAL SYSTEM INSTRUCTION MANUAL REVISION HISTORY APPENDIX D MISCELLANEOUS D ...
Страница 686: ...iv L30 LINE CURRENT DIFFERENTIAL SYSTEM INSTRUCTION MANUAL ABBREVIATIONS ...