html{display:none} Feeder Protection | Schweitzer Engineering Laboratories

Feeder protection improves the safety and reliability of your distribution feeder system by combining complete primary and backup protection with comprehensive overcurrent and arc-flash protection capabilities. These devices are suited for use in utility-, industrial-, and commercial-scale power systems. 

Comparison Chart

Advanced Feeder Protection Relays

These advanced relays provide complete primary and backup protection, overcurrent and arc-flash protection, extensive communications capabilities, and flexible I/O.

Distribution Feeder Protection Features

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   
27/59 Under-/Overvoltage  
32 Directional Power Elementsƒ    
49 IEC Line/Cable Thermal Overloadƒ       

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 Channels6/64/4 4/4 4/4 4/0 Standard
4/3 Optional
4/3 Standard
4/5 Optional
4/0 Standard
4/5 Optional
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 Monitorƒ 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       
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