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

Transformer Protection and Monitoring Features

Breaker Failure Protectionƒƒƒƒƒ
Transformer and Machine Current Differential 
Low-Impedance Bus Differential   
Underfrequency Load Sheddingƒ    
Undervoltage Load Sheddingƒ    
Three-Phase Current Inputs534222, 3, or 42
Three-Phase Voltage Inputs21  1+1+ 1+
Protection Elements
24 Overexcitation (Volts/Hertz)    
25 Synchronism Check      
27I Inverse Time Undervoltage (Phase, Phase to Phase, Sequential, Vsync)       
27/59 Under-/Overvoltage    
32 Directional Power     
46 Current Unbalance       
49 Equipment Thermal Monitoring   
50FO Flashover Protectionƒƒ  ƒƒ  
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
67 (P,G,Q) Directional Overcurrent (Phase, Ground, Negative Sequence)       
81 Under-/Overfrequency    
81R Rate-of-Change-of-Frequencyƒ       
87 Phase Differential 
REF Restricted Earth Fault  
Instrumentation and Control
SELogic Control Equations
Voltage Check on Closingƒƒ  ƒ  
Transformer Cooling Fan Controlƒ   ƒƒ 
Nonvolatile Latch Control Switches 
SELogic Remote Control Switches
SELogic Local Control Switches 
Analog Control Variables       
Display Points 
Multiple Settings Groups  
Substation Battery Monitor  ƒ
Breaker Wear Monitor   
Event Report (Multicycle Data)
Sequential Events Recorder 
Instantaneous Meter
Demand Meter
Load and Temperature Profile Report    
Resistance Temperature Detector (RTD) Inputs    
Built-In Web Server     
IEEE C37.118 Synchrophasors     
IEC 61850   
IEC 61850 Edition 2    
Simple Network Time Protocol (SNTP)    
Parallel Redundancy Protocol (PRP)     
IEEE 1588 Precision Time Protocol Version 2 (PTPv2)      
Time-Domain Link (TiDL) Technology       
Through-Fault Monitor 
Thermal Model/SEL-2600 RTD Module Communications  
Miscellaneous Features
Spanish Language Support       
Connectorized (Quick Disconnect) Available  

Standard Feature

Model Option

ƒ This function may be created using relay, device word bits, analog quantities, and timers.