Introducing SEL-T401L Ultra-High-Speed Line Relay
The SEL-T401L is a new transmission line relay that combines time-domain technology and phasor-based protection in a single device.
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| Features | SEL-2407 | SEL-2488 |
| Average Time Accuracy (demodulated IRIG-B and pulses) to UTC | ±100 ns | ±40 ns |
| Peak Time Accuracy (demodulated IRIG-B and pulses) to UTC | ±500 ns | ±100 ns |
| Holdover Accuracy Over 24 Hours at a Constant Temperature | 6.9 ms | 36 µs with standard TCXO, 5 µs with OCXO |
| Demodulated IRIG-B Ports | Up to 6 | Up to 8 |
| Demodulated IRIG-B BNC Output Voltage and Cable Length | 3.5 V up to 130 feet | 5.0 V up to 500 feet |
| Modulated IRIG-B Ports | 1 | Up to 4 |
| Ethernet Ports | 0 | 4 (can be copper, single-mode fiber, or multimode fiber, ordered in pairs) |
| NTPv4 | No | Yes |
| NTP Time-Stamp Accuracy (typical) to UTC | — | <100 µs |
| PTP Grandmaster (IEEE 1588) | No | Yes, with PTP option |
| PTP Time-Stamp Accuracy (peak) to UTC | — | ±100 ns |
| PPS, kPPS | Yes | Yes |
| ASCII Outputs | Yes | No |
| Time Display | Yes | Yes |
| Configurable Cable Delay Compensation | No | Yes |
| Power Supplies | 1 standard | 1 standard, 1 optional |
| Management Interface | Serial | Web |
| Syslog | No | Yes |
| Role-Based Accounts, LDAP Support | No | Yes |
| SNMP Traps | No | Yes |
| acSELerator QuickSet SEL-5030 Software Support | No | Yes |
| Operating Temperature | –40° to +80°C (–40° to +176°F) | –40° to +85°C (–40° to +185°F) |
| Time Source | GPS | GPS and GLONASS |
| Recommended Antenna | SEL-9524A | SEL-9524B |
| Antenna Cable Length | Up to 400 feet | Up to 500 feet |
| Satellite Signal Verification | No | Yes, with SEL-9524B GNSS antenna kit |
| IEC 60255, IEC 61000, IEEE C37.90 | Yes | Yes |
| Output Drive Levels | 3.5 Vdc | 5.0 Vdc |
| IRIG-B Over Fiber | Use optional fiber-optic serial port | Use SEL-2812 with DB-9 port |
| Alarm Contact | Yes | Yes |
