html{display:none} Bus Protection Features | Schweitzer Engineering Laboratories
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Bus Protection Features

FeaturesSEL-387SEL-487BSEL-487ESEL-587Z
Applications
Breaker Failure Protection ƒ ƒ
Bus Differential ƒ
Transformer and Machine Current Differential    
High-Impedance Bus Differential      
Low-Impedance Bus Differential  
Three-Phase Current Inputs 4 7/
10/
21 ‡
5 Com-
mon
Three-Phase Voltage Inputs   1 2  
Protection
27/59 Under-/Overvoltage    
46 Current Unbalance   ƒ  
47 Voltage Unbalance     ƒ  
50 (N,G) Overcurrent (Neutral, Ground)  
50P Phase Overcurrent
50Q Negative-Sequence Overcurrent  
51 (N,G) Time-Overcurrent (Neutral, Ground)  
51P Phase Time-Overcurrent
51Q Negative-Sequence Time-Overcurrent  
87 Current Differential  
87Z High-Impedance Differential      
Single-Pole Trip/Close      
Three-Phase Differential Bus Zones 1 2/
3/
6 ‡
1 1
Check Zones   3    
Instrumentation and Control
79 Automatic Reclosing   ƒ ƒ  
Dynamic Zone Selection      
SELogic Control Equations
Nonvolatile Latch Control Switches  
SELogic Remote/Local Control Switches
Display Points
Multiple Settings Groups  
Substation Battery Monitor  
Breaker Wear Monitor    
Event Report (Multicycle Data)
Sequential Events Recorder
Instantaneous Meter
Demand Meter  
Through-Fault Monitor    
IEEE C37.118 Synchrophasors      
Synchrophasor Real-Time Control      
IEC 61850    
Built-In Web Server    
Simple Network Time Protocol (SNTP)    
Mirrored Bits Communications    
Parallel Redundancy Protocol (PRP)    
IEEE 1588 Precision Time Protocol Verion 2 (PTPv2)    
Time-Domain Link (TIDL) Technology    
Miscellaneous Features
Connectorized (Quick Disconnect) Available  

Standard Feature

Model Option

ƒ This function may be created using settings

1/2/3 Relay Application

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