Features - GE UR Series Instruction Manual
Line differential relay
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Also See for UR Series:
- Instruction manual (652 pages) ,
- Manual (433 pages) ,
- Release notes (33 pages)
Table of Contents
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2.1 INTRODUCTION
LINE CURRENT DIFFERENTIAL:
•
Phase segregated, high-speed digital current differential system
•
Overhead and underground AC transmission lines, series compensated lines
•
Two and three terminal line applications
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 Discrete Fourier Transform with 64 samples per cycle and transmitting 2 time-
stamped phaselets per cycle
•
Adaptive restraint approach improving sensitivity and accuracy of fault sensing
•
Increased security for trip decision using Disturbance Detector and Trip Output logic
•
Continuous clock synchronization via the distributed synchronization technique
•
Increased transient stability through DC decaying offset removal
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Accommodates up to 5 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 and G.703 connections with relay ID check
•
Per phase line differential protection Direct Transfer Trip plus 8 user-assigned pilot signals via the communications
channel
•
Secure 32-bit CRC protection against communications errors
BACKUP PROTECTION:
•
DTT provision for pilot schemes
•
1 zone distance protection with POTT scheme, power swing blocking/out-of-step tripping, line pickup, and load
encroachment
•
2-element TOC and 2-element IOC directional phase overcurrent protection
•
2-element TOC and 2-element IOC directional zero sequence overcurrent protection
•
2-element TOC and 2-element IOC negative sequence overcurrent protection
•
Undervoltage and overvoltage protection
ADDITIONAL PROTECTION:
•
Breaker failure protection
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Stub bus protection
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VT and CT supervision
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GE "Sources" approach allowing grouping of different CTs and VTs from multiple input channels
•
Open pole detection
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Breaker trip coil supervision and "seal-in" of trip command
•
FlexLogic™ allowing creation of user-defined distributed protection and control logic
CONTROL:
•
1 and 2 breakers configuration for 1½ and ring bus schemes, pushbutton control from the relay
•
Auto-reclosing and synchrochecking
•
Breaker arcing current
2-2
L90 Line Differential Relay
2 PRODUCT DESCRIPTION
2.1.2 FEATURES
GE Power Management
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