| 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 |
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51 (P,N,G,Q) Time-Overcurrent Element (Phase, Neutral, Ground, Neg. Seq.) |
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67 (P,N,Q) Directional Overcurrent (Phase, Neutral, Neg. Seq.) |
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| 78VS Vector Shift | |||||||||
| 81 Over-Underfrequency | |||||||||
| Separate Neutral Overcurrent | |||||||||
| Load-Encroachment Supervision | |||||||||
| Low-Energy Analog (LEA) Voltage Inputs | |||||||||
Directional Sensitive Earth Fault Protection |
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| 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 |
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| 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 |
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| 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) |
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| 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) |
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Time-Domain Link (TIDL) Technology |
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| 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 |
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| Simple Network Time Protocol (SNTP) | |||||||||
| Harmonic Metering | |||||||||
| RMS Metering | |||||||||
ƒ This function can be programmed using logic