Product Comparison

Distribution Feeder Protection Features

Features SEL-451 SEL-351 SEL-351A SEL-351S SEL-851 SEL-751 SEL-751A SEL-501
SEL-501-2
SEL-551
SEL-551C
Distribution Protection—Applications
Distribution Feeder Protection
BF Breaker Failure Protection
ƒ
ƒ
Generator Intertie Protection
 
   
25 Synchronism Check
 
   
Underfrequency Load Shedding ƒ
   
Undervoltage Load Shedding ƒ
   
Protection
27/59 Under-/Overvoltage
   
32 Directional Power Elements ƒ
 
   
49 IEC Line/Cable Thermal Overload ƒ        
     

50 (P,N,G,Q) Overcurrent Element
(Phase, Neutral, Ground, Neg. Seq.)

51 (P,N,G,Q) Time-Overcurrent Element
(Phase, Neutral, Ground, Neg. Seq.)
67 (P,N,Q) Directional Overcurrent
(Phase, Neutral, Neg. Seq.)
 
     
78VS Vector Shift          
     
81 Over-Underfrequency
   
Separate Neutral Overcurrent
 
Load-Encroachment Supervision
 
     
Low-Energy Analog (LEA) Voltage Inputs
       
     
Directional Sensitive Earth Fault Protection  
 
     
Pilot Protection Logic
 
         
81R User Rate-of-Change-of-Frequency (df/dt) ƒ
 
   
81RF Fast Rate-of-Change-of-Frequency ƒ        
   
Harmonic Blocking
     
Arc Sense Technology (AST)
High-Impedance Fault Detection
       
   
Arc-Flash Detection        
   
Phantom Phase Voltage  
         
Current/Voltage Channels 6/6 4/4 4/4 4/4 4/0 Standard
4/3 Optional
4/3 Standard
4/5 Optional
4/0 Standard
4/5 Optional
6/0 4/0
Complete Two-Breaker Control
           
 
Instrumentation and Control
79 Automatic Reclosing
 
Fault Locating
 
     
SELOGIC Control Equations
With Remote Control Switches
 
SELOGIC Counters
     
   
Voltage Check on Closing
 
   
SELOGIC Nonvolatile Latch
 
Nonvolatile Local Control Switches
 
Substation Battery Monitor
 
   
Breaker/Recloser Wear Monitor
 
   
Trip Coil Monitor ƒ ƒ ƒ ƒ   ƒ ƒ   ƒ
Voltage Sag, Swell, and Interruption (VSSI)
 
         
Load/Signal Profile Recorder
 
   
Sequential Events Recorder
 
Software-Invertible Polarities
     
       
IEC 60255-Compliant Thermal Model
               
DNP3 Level 2 Outstation
   
Parallel Redundancy Protocol (PRP)
 
     
IEEE 1588 Precision Time Protocol Version 2 (PTPv2)
       
     
Time-Domain Link (TIDL) Technology
               
IEEE C37.118 Synchrophasors
 
   
Bay Control
       
     
Ethernet
   
EtherNet/IP          
   
Built-In Web Server
     
     
IEC 61850
   
IEC 61850 Edition 2
     
     
IEC 61850-9-2 Sampled Values Technology
               
Firmware Option With Mirrored Bits Communications Available
 
   
Simple Network Time Protocol (SNTP)
   
Harmonic Metering  
       
RMS Metering
   

Standard Feature

Model Option

ƒ This function can be programmed using logic

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SEL support teams are stationed in regional offices around the world and staffed with application engineers who are experts in our products and in power system applications.

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