Busbar Protection
Bus protection products and systems provide complete primary and backup protection for all types of bus and switchgear arrangements. They are suited for use in utility-, industrial-, and commercial-scale power systems.
Busbar Protection Relays
These relays can be applied alone or combined for a complete busbar and switchgear protection solution.
Overcurrent Protection Relays
Flexible in application, these relays can be applied in complete busbar and switchgear protection solutions.
System Components
Combining these components with bus protection relays expands their functionality.
Bus Protection Features
| Features | SEL-387 | SEL-487B | SEL-487E | SEL-587Z |
|---|---|---|---|---|
| Applications | ||||
| Breaker Failure Protection | ƒ | ƒ | ||
| Bus Differential | ƒ | |||
| Transformer and Machine Current Differential | ||||
| High-Impedance Bus Differential | ||||
| Low-Impedance Bus Differential | ||||
| Three-Phase Current Inputs | 4 | 7/ 10/ 21 ‡ | 5 | Com- mon |
| Three-Phase Voltage Inputs | 1 | 2 | ||
| Protection | ||||
| 27/59 Under-/Overvoltage | ||||
| 46 Current Unbalance | ƒ | |||
| 47 Voltage Unbalance | 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 | ||||
| 87 Current Differential | ||||
| 87Z High-Impedance Differential | ||||
| Single-Pole Trip/Close | ||||
| Three-Phase Differential Bus Zones | 1 | 2/ 3/ 6 ‡ | 1 | 1 |
| Check Zones | 3 | |||
| Instrumentation and Control | ||||
| 79 Automatic Reclosing | ƒ | ƒ | ||
| Dynamic Zone Selection | ||||
| SELogic Control Equations | ||||
| Nonvolatile Latch Control Switches | ||||
| SELogic Remote/Local Control Switches | ||||
| Display Points | ||||
| Multiple Settings Groups | ||||
| Substation Battery Monitor | ||||
| Breaker Wear Monitor | ||||
| Event Report (Multicycle Data) | ||||
| Sequential Events Recorder | ||||
| Instantaneous Meter | ||||
| Demand Meter | ||||
| Through-Fault Monitor | ||||
| IEEE C37.118 Synchrophasors | ||||
| Synchrophasor Real-Time Control | ||||
| IEC 61850 | ||||
| Built-In Web Server | ||||
| Simple Network Time Protocol (SNTP) | ||||
| Mirrored Bits Communications | ||||
| Parallel Redundancy Protocol (PRP) | ||||
| IEEE 1588 Precision Time Protocol Verion 2 (PTPv2) | ||||
| Time-Domain Link (TIDL™) Technology | ||||
| Miscellaneous Features | ||||
| Connectorized (Quick Disconnect) Available | ||||
Standard Feature
Model Option
ƒ This function may be created using settings
‡ 1/2/3 Relay Application