html{display:none} Generator Protection | Schweitzer Engineering Laboratories
Generation / Protection

Generator Protection

Generator protection products and systems provide complete primary and backup protection for all types of generator faults. They are suited for use in utility-, industrial-, and commercial-scale power generation systems.

Comparison Chart

Generator Protection Features

Generator Protection  
Unit/Overall (Generator and Generator Step-Up [GSU]) Differential Protection     
Independent GSU Transformer Protection     
Pumped-Storage Hydro Protection    
Integrated Synchronizer   
Breaker Failure Protection ƒ  
Equipment Thermal Monitoring
Generator Intertie Protection     
Feeder Protection      
21C Compensator Distance     
21C Compensator Distance    
21P Phase Mho Distance    
24 Overexcitation (Volts/Hertz)  
25 Synchronism Check  
27/59 Under-/Overvoltage  
27I/59I Inverse-Time Undervoltage/Overvoltage   
32 Directional Power 
40 Impedance-Based Loss-of-Field  
40 Capability-Based Loss-of-Field     
46 Current Unbalance  
46 Harmonic Current Unbalance     
49 Thermal Model   
49R Thermal Overload (RTD)
50 (P,N,G) Overcurrent (Phase, Neutral, Ground)
50Q Negative-Sequence Overcurrent
51 (N,G) Time-Overcurrent (Neutral, Ground)
51 (P,Q) Time-Overcurrent (Phase, Neg. Seq.)   
60 Loss-of-Potential  
60 Voltage Balance Loss-of-Potential     
60 (P,N) Independent Split-Phase (Phase, Neutral)     
64G 100 Percent Stator Ground   
64G Intermittent Ground Fault Detection     
64F Field Ground  
67 (N,G) Directional Overcurrent (Neutral, Ground)   
67Q Negative-Sequence Directional Overcurrent   
78 Out-of-Step   
78 Dual Zone (Generator and System) Out-of-Step With Pole Slip Counters     
78VS Vector Shift    
81 Over-/Underfrequency  
81R Rate-of-Change-of-Frequency   
87 Stator Differential   
Transformer Differential     
REF Restricted Earth Fault    
Separate Neutral Overcurrent  
Inadvertent Energization ƒ   
Flashover Protection ƒ ƒ   
Instrumentation and Control
SELogic Control Equations/Remote Control Switches
Nonvolatile Latch Control Switches
Multiple Settings Groups
Station Battery Monitor    
Breaker Wear Monitor
Event Report (Multicycle Data)/Sequential Events Recorder
Disturbance Recording (up to 300 seconds)    
Demand Meter
Load Profile Report  
RTD (Resistance Temperature Detector) Inputs
Built-In Web Server 
IEEE 1588 Precision Time Protocol (PTP) 
IEC 61850  
IEC 61850 Edition 2  
IEC 60870-5-103   
Parallel Redundancy Protocol (PRP)  
DNP3 Serial  
Simple Network Time Protocol (SNTP)  
Modbus TCP  
Modbus RTU Outstation  
IEEE C37.118 Synchrophasors  
Synchrophasor Protocol Edition C37.118 2011 C37.118 2005C37.118 2005C37.118 2005
Mirrored Bits Communications  
Miscellaneous Features
Dual Frequency Zones (Generator and System)    
Frequency Tracking Range5–120 Hz 20–70 Hz 15–70 Hz 15–70 Hz 15–70 Hz
Accepts Wye or Open-Delta Voltage Transformers  
Connectorized (Quick Disconnect) Available    

Standard Feature

Model Option

ƒ This function may be created using settings