GE Multilin
L30 Line Current Differential System
2-3
2 PRODUCT DESCRIPTION
2.1 INTRODUCTION
2
2.1.2 FEATURES
LINE CURRENT DIFFERENTIAL:
•
Phase segregated, high-speed digital current differential system.
•
Overhead and underground AC transmission lines, series compensated lines.
•
Two-terminal and three-terminal line applications.
•
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.
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.
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.
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.
Summary of Contents for L30
Page 10: ...x L30 Line Current Differential System GE Multilin TABLE OF CONTENTS ...
Page 30: ...1 20 L30 Line Current Differential System GE Multilin 1 5 USING THE RELAY 1 GETTING STARTED 1 ...
Page 370: ...5 244 L30 Line Current Differential System GE Multilin 5 10 TESTING 5 SETTINGS 5 ...
Page 464: ...A 10 L30 Line Current Differential System GE Multilin A 1 PARAMETER LISTS APPENDIX A A ...
Page 600: ...C 30 L30 Line Current Differential System GE Multilin C 7 LOGICAL NODES APPENDIX C C ...
Page 610: ...D 10 L30 Line Current Differential System GE Multilin D 1 IEC 60870 5 104 APPENDIX D D ...
Page 622: ...E 12 L30 Line Current Differential System GE Multilin E 2 DNP POINT LISTS APPENDIX E E ...
Page 634: ...F 12 L30 Line Current Differential System GE Multilin F 3 WARRANTY APPENDIX F F ...
Page 644: ...x L30 Line Current Differential System GE Multilin INDEX ...