Features - GE L90 Instruction Manual

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
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