2
Description of Relay
7UT51 v3
16 PRIM-2330C
2.2.8 Commissioning Data
The 7UT51 can be placed in test mode to aid in
commissioning the transformer and protection system.
• Restraint Values
- 3 Phases, Segregated
- Ground Restraint (87N application)
• Differential Values
- 3 Phases, Segregated
- Ground Differential (87N application)
• Phase Angle Relationship Between
- Phases of Same Winding
- Same Phases of Different Windings
- Calculated Residual and Actual Ground
Currents
- Actual Ground Current and Phase Currents
2.2.9 Data Acquisition
• 12 Samples per Cycle Sampling Rate
• Event Log: 50 Events (1 s resolution)
• 3 Fault Logs: 80 Events per Log (1 ms resolution)
• Real-Time Clock with Time Stamping
• Waveform Capture: 8 Waveform Records
- 5 s Buffer Total
- Selectable Pre/Post-Fault
- Individual Record Maximum Duration
- Internal or External Trigger or Both. (External
trigger may be used to initiate capture from
sudden pressure or other relay operations.)
- Manual waveform capture via PC or front
panel
• Battery Backup Memory for Data
2.2.10 Configuration & Analysis
Software (WinDIGSI
®
)
• Windows-Based Graphical User Interface
• Menu-Driven for Settings, Configuration, Metering,
Log Interrogation, & Waveform Viewing
• Advanced Oscillographic Analysis Capability
• COMTRADE Compatible (import, export, storage)
2.2.11 Data Communication Ports
• Front RS-232 Communications Port (Engineer/
technician can access through PC.)
- Selectable Data Rates to 19.2k Baud
- IEC 870-5 Compliant Communication
Protocols
• Rear RS-232 Communications Port Galvanically
Isolated Wire Port or Optional Fiberoptic (820nm)
Port
- Selectable Data Rates to 19.2k Baud
- IEC 870-5 Compliant Communication
Protocols
- Substation RTU Applications (11 bit)
- Modem Applications (10 bit)
2.2.12 Control
• Programmable inputs, LEDs, alarm contacts & trip
contacts
• External Trips with Timers
• Process or Re-Transmit External Signals or
Commands
• Combines External Signals into Alarm Processing
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