Feeder Protection
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.
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.
Feeder Protection Relays
These relays provide primary and backup feeder protection.
System Components
Combining these components with feeder protection relays expands their protection functionality.
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 | |||||||||
| 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