Schweitzer Engineering Laboratories SEL-311L Instruction Manual page 175

SECTION 5: TRIP AND TARGET LOGIC ........................................... 5-1
Introduction .................................................................................................................................. 5-1
Line Current Differential Trips .................................................................................................... 5-1
High-Speed 87L Tripping..................................................................................................... 5-1
87L Tripping Via SEL
87L High-Speed Direct Transfer Tripping ........................................................................... 5-1
87L Tripping Qualified by the Local Disturbance Detector ................................................ 5-2
Backup Protection Trips............................................................................................................... 5-5
Set Trip ................................................................................................................................. 5-7
Unlatch Trip.......................................................................................................................... 5-8
Factory Settings Example (Using Setting TR) ..................................................................... 5-8
Additional Settings Examples .............................................................................................. 5-9
Program an Output Contact for Tripping ........................................................................... 5-10
Switch-Onto-Fault (SOTF) Trip Logic ...................................................................................... 5-10
Three-Pole Open Logic ...................................................................................................... 5-11
Circuit Breaker Operated Switch-Onto-Fault Logic .......................................................... 5-12
Close Bus Operated Switch-Onto-Fault Logic................................................................... 5-13
Switch-Onto-Fault Logic Output (SOTFE)........................................................................ 5-13
Switch-Onto-Fault Trip Logic Trip Setting (TRSOTF) ..................................................... 5-13
Communications-Assisted Trip Logic-General Overview ...................................................... 5-14
Enable Setting ECOMM..................................................................................................... 5-15
Trip Setting TRCOMM ...................................................................................................... 5-15
Trip Settings TRSOTF and TR........................................................................................... 5-16
Trip Setting DTT ................................................................................................................ 5-16
Use Existing SEL-321 Relay Application Guides for the SEL-311L Relay...................... 5-16
Permissive Overreaching Transfer Trip (POTT) Logic ............................................................. 5-17
Use Existing SEL-321 Relay POTT Application Guide for the SEL-311L Relay ............ 5-17
External Inputs.................................................................................................................... 5-17
Timer Settings .................................................................................................................... 5-18
Logic Outputs ..................................................................................................................... 5-18
Weak-Infeed Logic and Settings ................................................................................................ 5-19
SEL-311L Relay Weak-Infeed Logic................................................................................. 5-19
Variations for Permissive Underreaching Transfer Trip (PUTT) Scheme ........................ 5-22
Installation Variations ........................................................................................................ 5-22
Directional Comparison Unblocking (DCUB) Logic ................................................................ 5-24
Use Existing SEL-321 Relay DCUB Application Guide for the SEL-311L Relay ........... 5-24
External Inputs.................................................................................................................... 5-24
Timer Settings .................................................................................................................... 5-25
Logic Outputs ..................................................................................................................... 5-26
Installation Variations ........................................................................................................ 5-28
Directional Comparison Blocking (DCB) Logic ....................................................................... 5-30
Use Existing SEL-321 Relay DCB Application Guide for the SEL-311L Relay .............. 5-30
Date Code 20010625
TABLE OF CONTENTS
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................................................................................................ 5-1
OGIC
Trip and Target Logic
SEL-311L Instruction Manual
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