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FOR THE FIRST TIME EVER

INCREMENTAL QUANTITIES AND
TRAVELING-WAVE PROTECTION

COME TOGETHER

INTRODUCING THE
FIRST TRAVELING-WAVE LINE
PROTECTIVE RELAY

SEL-T400L TIME-DOMAIN LINE PROTECTION

3.21.17

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World's Fastest Transmission Line Relay

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World’s Fastest Transmission Line Relay

The SEL-T400L Time-Domain Line Protection breaks the speed barrier of phasor-based relays. Working on time-domain and traveling-wave principles, the SEL-T400L is an ultra-high-speed transmission line relay that trips four to ten times faster—with no loss in security—than today’s best relays.

4 ms

TD21: Incremental Quantity Distance

2 ms

TD32: Incremental Quantity Directional

1 ms

TW87: Traveling-Wave Differential

1 ms

TW32: Traveling-Wave Directional

Breakthrough Sampling

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Breakthrough Sampling

The SEL-T400L is the only relay that samples voltages and currents at an unprecedented million samples per second with stunning resolution. Fast Time-Domain Values (FTDV) are streamed in real time, opening up a whole new world of power system information for you to see and act on. You'll now be able to see breaker restrikes, self-extinguishing faults and their locations, switching events, and other high-frequency signatures over wide areas—in real time. You can identify power quality issues and even discover and locate failing insulators.

You've never seen your power system like this before. And it's only the beginning.

1 MHz

Sampling Rate

18-Bit

Analog-to-Digital Resolution

50-Event

Recording Capability

1.2 Seconds

Duration of a Recorded Event