SEL SEL-TMU TiDL Merging Unit

SEL-TMU

TiDL Merging Unit

The SEL-TMU is a remote data acquisition device designed for use in an SEL Time-Domain Link (TiDL) technology system.

Placed in the substation yard, the SEL-TMU digitizes analog signals from primary equipment and then transmits them via fiber-optic cable to SEL TiDL relays in the control house.

Data Digitization—The SEL-TMU digitizes discrete I/O signals and analog data, such as voltages and currents, from primary equipment and transmits the data to a TiDL relay via point-to-point fiber connections.

The SEL-TMU data stream is automatically and independently synchronized to each connected relay, eliminating the need for an external time source.

Data Sharing—An SEL-TMU can communicate with as many four TiDL relays over direct fiber-optic connections without the need for a network switch.

This data-sharing capability gives you flexibility on how to best design protection for your system and makes installations more economical by reducing the device count.

Simple, Purpose-Built Hardware—With no user settings and no microcontroller, the SEL-TMU is easy to deploy and manage long-term. Pluggable, self-shorting CT connections increase personnel safety by providing an additional layer of protection and make swapping connections between SEL-TMU devices quick and easy.

Robust Self-Monitoring—The SEL-TMU provides robust self-monitoring to detect an out-of-tolerance condition within the device.

If an out-of-tolerance condition occurs, the SEL-TMU takes appropriate action, such as disabling outputs on a detected failure to avoid spuriously tripping a breaker, and then alerts the connected TiDL relays.

The LED interface indicates the status of each port and the overall hardware health.

Small form-factor pluggable (SFP) fiber ports allow the SEL-TMU to communicate with up to four TiDL relays. SFP transceivers must be ordered separately.

The 16 universal contact inputs operate over a range of 24–250 Vdc.

7 flexible contact outputs support tripping, signaling, or switching applications.

SEL-TMU