SEL Wireless Protection System
SEL-FT50 Fault Transmitter, SEL-RP50 Fault Repeater, and SEL-FR12 Fault Receiver
The SEL Wireless Protection System helps relays make better tripping and reclosing decisions based on the location of a fault, augmenting your existing distribution protection schemes to improve the reliability and safety of your feeder. The system’s components include the SEL-FT50 Fault Transmitter, SEL-RP50 Fault Repeater, and SEL-FR12 Fault Receiver. When the SEL-FT50 detects a fault, it quickly broadcasts the fault status via 900 MHz wireless signals directly to an SEL-FR12 or via multiple SEL-RP50 repeaters to an SEL-FR12. The SEL-FR12 provides the fault status directly to a protective relay or recloser control via high-speed Mirrored Bits communications. In all, it takes just 6 ms to send the data to a protective relay, with each fault repeater used in the communications chain only adding up to 1.5 ms of delay to the overall system latency.
SEL-RP50: $310 USD
SEL-FR12: $752 USD
Starting At
SEL-FT50: $310 USDSEL-RP50: $310 USD
SEL-FR12: $752 USD
Block Reclosing for Underground Faults
It can be challenging to determine whether a fault has occurred on the overhead or underground section of a feeder. Traditionally, utilities have had to choose between the possibility of undesired reclosing into an underground fault or blocking reclosing for a close-in overhead fault when a high-current lockout is used. By installing the SEL-FT50 at the riser pole, the relay can receive fault status information via the SEL-FR12 before the first trip and know whether the fault is overhead or underground. The relay is then programmed to only allow reclosing when the SEL-FT50 signals that the fault is on the overhead portion of the feeder.
Fast Bus Tripping
Fast bus tripping schemes can provide an economical solution for substation bus protection on radial systems. However, in some cases, communication between relays may not be feasible or may be cost prohibitive. The SEL-FT50 and SEL-FR12 install easily on substation feeders, allowing protective relays to differentiate between a fault on the feeder and a fault on the bus with fast wireless communication to speed up bus protection.
High-Density Recloser Trip Blocking
A higher density of protective devices on distribution networks can help improve reliability metrics by reducing the number of utility customers within any isolation zone. Traditional relaying coordination methods become increasingly difficult to implement as the total number of devices increases. Combining the SEL-FT50, SEL-FR12, and SEL-RP50 can enable relays and recloser controls to implement fast, economical trip blocking schemes while coordinating with lateral fuses.