P.1.11
Date Code 20151029 Protection Manual SEL-411L Relay
Introduction and Specifications
Applications
Reclosing and
synchronism check
2 shots SPT; 4 shots 3PT
Leader/follower breaker arrangements
Two-circuit-breaker universal synchronism check
Coupling-Capacitor Volt-
age Transformer (CCVT)
transient detection logic
Detect CCVT transients to provide correct operation of the
direct tripping (Zone 1) distance elements
Long lines Load-encroachment elements prevent unwanted trips on load
Voltage elements detect local bus overvoltages
Sensitive negative-sequence and residual overcurrent elements
provide sensitive backup protection
Charging current compensation for differential element
Tapped and
three-terminal lines
Five zones
Three zero-sequence compensation factors for more accurate
ground-distance reach on either side of tap
Independent reach settings for phase, ground mho and phase,
ground quadrilateral elements
Multiple settings groups cover any switching configurations
Differential protection for up to four terminals with Ethernet
connection
Bus-tie or transfer
circuit breakers
Multiple setting groups
Match relay settings group to each line substitution
Eliminate current reversing switches
Local or remote operator switches the setting groups
Subtransmission lines Time-step distance protection
Ground directional overcurrent protection
Torque-controlled time-overcurrent elements
Lines with capacitors Series-compensated line logic
Lines with transformers Negative-sequence overcurrent protection
Line differential capable of protecting in-line transformer lines
Short transmission lines Directional overcurrent elements and communications-
assisted tripping schemes, quadrilateral phase distance
Permissive Overreach-
ing Transfer Tripping
(POTT) schemes
Current reversal guard logic
Open breaker echo keying logic
Weak-infeed and zero-infeed logic
Time-step distance backup protection
Directional Comparison
Unblocking Tripping
(DCUB) schemes
Includes all POTT logic
All loss-of-channel logic is inside the relay
Time-step distance backup protection
Permissive Under-
reaching Transfer
Tripping (PUTT) schemes
Supported by POTT logic
Time-step distance backup protection
Directional Comparison
Blocking Trip (DCB)
schemes
Current reversal guard logic
Carrier coordinating timers
Carrier send and receive extend logic
Zone 3 latch eliminates the need for offset three-phase
distance elements
Time-step distance backup protection
Direct Transfer
Tripping (DTT) schemes
SEL
OGIC control equations program the elements that key
direct tripping
SCADA applications Analog and digital data acquisition for station wide functions
Table 1.2 Application Highlights (Sheet 2 of 3)
Application Key Features
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