2-4
L30 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
PRODUCT DESCRIPTION
CHAPTER 2: PRODUCT DESCRIPTION
2
•
Zero-sequence removal for application on lines with tapped transformers connected in a grounded wye on the line
side
•
GE phaselets approach based on the Discrete Fourier Transform with 64 samples per cycle and transmitting two time-
stamped phaselets per cycle
•
Adaptive restraint approach improving sensitivity and accuracy of fault sensing
•
Accommodates in-zone transformer with a magnitude and phase compensation and second harmonic inhibit during
transformer magnetizing inrush
•
Continuous clock synchronization via the distributed synchronization technique
•
Increased transient stability through DC decaying offset removal
•
Accommodates up to five times CT ratio differences
•
Peer-to-peer (master-master) architecture changing to master-slave via DTT (if channel fails) at 64 kbps
•
Charging current compensation
•
Interfaces direct fiber, multiplexed RS422, IEEE C37.94, and G.703 connections with relay ID check
•
Per-phase line differential protection direct transfer trip plus eight user-assigned pilot signals via the communications
channel
•
Secure 32-bit CRC protection against communications errors
•
Channel asymmetry (up to 10 ms) compensation using GPS satellite-controlled clock
2.1.1.2 Backup protection
•
DTT provision for pilot schemes
•
Two-element time overcurrent and two-element instantaneous overcurrent directional phase overcurrent protection
•
Two-element time overcurrent and two-element instantaneous overcurrent directional zero-sequence protection
•
Two-element time overcurrent and two-element instantaneous overcurrent negative-sequence overcurrent
protection
•
Undervoltage and overvoltage protection
2.1.1.3 Additional protection
•
Breaker failure protection
•
Stub bus protection
•
VT and CT supervision
•
GE Multilin
sources
approach allowing grouping of different CTs and VTs from multiple input channels
•
Open pole detection
•
Breaker trip coil supervision and seal-in of trip command
•
FlexLogic allowing creation of user-defined distributed protection and control logic
2.1.1.4 Control
•
One and two breaker configuration for breaker-and-a-half and ring bus schemes, pushbutton control from the relay
•
Auto-reclosing and synchrochecking
•
Breaker arcing current
2.1.1.5 Monitoring
•
Oscillography of current, voltage, FlexLogic operands, and digital signals (1
×
128 cycles to 31
×
8 cycles configurable)
•
Events recorder: 1024 events
•
Fault locator
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 ...