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Features - GE L90 Instruction Manual

Line differential relay ur series.
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2 PRODUCT DESCRIPTION
Table 2–2: OTHER DEVICE FUNCTIONS
FUNCTION
2
Breaker Arcing Current (I
t)
Breaker Control
Contact Inputs (up to 96)
Contact Outputs (up to 64)
Control Pushbuttons
CT Failure Detector
Data Logger
Digital Counters (8)
Digital Elements (16)
Direct Inputs (8 per L90 comms channel)
DNP 3.0 or IEC 60870-5-104 Comms.
Event Recorder
Fault Locator and Fault Reporting
FlexElements™ (16)
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
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
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
Channel asymmetry (up to 10 ms) compensation using GPS satellite-controlled clock
BACKUP PROTECTION:
DTT provision for pilot schemes
Three zones of distance protection with POTT scheme, power swing blocking/out-of-step tripping, line pickup, and load
encroachment
Two-element time overcurrent and 2-element instantaneous overcurrent directional phase overcurrent protection
Two-element time overcurrent and 2-element instantaneous overcurrent directional zero-sequence protection
GE Multilin
FUNCTION
FlexLogic™ Equations
IEC 61850 Communications
IEC 61850 Remote Inputs/Outputs (GSSE)
L90 Channel Tests
Line Pickup
Load Encroachment
Metering: Current, Voltage, Power,
Energy, Frequency, Demand,
Power Factor, 87L current,
local and remote phasors
Modbus Communications
Modbus User Map
Non-Volatile Latches
Non-Volatile Selector Switch
Open Pole Detector
L90 Line Differential Relay
2.1 INTRODUCTION
FUNCTION
Oscillography
Pilot Scheme (POTT)
Setting Groups (6)
Stub Bus
Time Synchronization over SNTP
Transducer Inputs/Outputs
User Definable Displays
User Programmable LEDs
User Programmable Pushbuttons
User Programmable Self-Tests
Virtual Inputs (32)
Virtual Outputs (64)
VT Fuse Failure

2.1.2 FEATURES

2
2-3

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