Transformer Protection
Transformer protection products and systems provide complete primary and backup protection for all types of transformer faults.
Transformer Protection Relays
These relays can be applied alone or combined for a complete transformer protection solution.
Differential Protection Relays
Flexible in application, these relays can be applied in transformer protection solutions.
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System Components
Combining these components with transformer relays expands their functionality.
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Transformer Protection and Monitoring Features
| Features | SEL-487E | SEL-387E | SEL-387 | SEL-387A | SEL-787 | SEL-787-2/-3/-4 | SEL-587 | SEL-2414 | ||
|---|---|---|---|---|---|---|---|---|---|---|
| Applications | ||||||||||
| Breaker Failure Protection | ƒ | ƒ | ƒ | ƒ | ƒ | |||||
| Transformer and Machine Current Differential | ||||||||||
| Low-Impedance Bus Differential | ||||||||||
| Underfrequency Load Shedding | ƒ | |||||||||
| Undervoltage Load Shedding | ƒ | |||||||||
| Three-Phase Current Inputs | 5 | 3 | 4 | 2 | 2 | 2, 3, or 4 | 2 | |||
| Three-Phase Voltage Inputs | 2 | 1 | 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 Protection | ƒ | ƒ | ƒ | ƒ | ||||||
| 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-Frequency | ƒ | |||||||||
| 87 Phase Differential | ||||||||||
| REF Restricted Earth Fault | ||||||||||
| Instrumentation and Control | ||||||||||
| SELogic Control Equations | ||||||||||
| Voltage Check on Closing | ƒ | ƒ | ƒ | |||||||
| Transformer Cooling Fan Control | ƒ | ƒ | ƒ | |||||||
| 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 | ||||||||||
| EtherNet/IP | ||||||||||
| 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.