The SEL-FT50 and SEL-FR12 system helps relays make better tripping and reclosing decisions based on the location of the fault. You can easily adapt it to your power system without interrupting service. The SEL-FT50 and SEL-FR12 system provides an innovative approach to enhance distribution substation protection and improve the reliability and safety of your feeder.
SEL-FT50: $180 USD
SEL-FR12: $549 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. With the SEL-FT50 Fault Transmitter installed at the riser pole, the relay can receive fault status information 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 system installs 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.
Block Reclosing for Underground Faults
Fast Bus Tripping
Easy to Deploy, Easy to Maintain
The lightweight design of the SEL-FT50 makes it easy to install by simply using a hot stick to clamp it to the overhead conductor. The SEL-FT50 is rated for voltages up to 38 kV and is completely line-powered, removing the need for battery maintenance.
Think Milliseconds, Not Seconds
The SEL-FR12 Fault Receiver can be paired with up to 12 line-powered SEL-FT50 Fault Transmitters. The SEL-FT50 broadcasts the status of faults via 900 MHz wireless signals to an SEL-FR12, which uses MIRRORED BITS communications to transmit the data to a protective relay—all in 6 ms!
Reduce Operation and Maintenance Costs
By identifying faults faster and shortening the duration of fault currents, the SEL-FT50 and SEL-FR12 system extends the life of equipment, reducing operation and maintenance costs.
The SEL-FT50 and SEL-FR12 system is approved for use by governments of the following countries:
SEL recommends these parts to go with the SEL-FR12 receiver and SEL-FT50 transmitters for specific applications:
These parts are available as “recommended accessories.” When you use the Popular Model selector to choose a receiver or transmitter, the accessories are available in the second step of the process.
*Other cable lengths are available.
|Compliance||Designed and manufactured under an ISO 9001-certified quality management system|
|Operating and Storage Temperature Range||–40° to +85°C (–40° to +185°F)|
|Operating Environment||Pollution degree: 2 |
Relative humidity: 5–95%, noncondensing
Maximum altitude: 2,000 m
|Ingress Protection (SEL-FT50)||IP67|
|Clamp Range (SEL-FT50)||0.25" to 1.25"||0.3" to 1.1"|
5.58" diameter, 6.97" height
5.71" diameter, 5.83" height
1.72" tall, 9.57" wide, 4.61" deep
Line-powered (no batteries)
Voltage: 9–30 Vdc
|Power System Frequency Range||45–65 Hz|
|Current Pickup Level|
Units individually configurable: 50, 100, 200, 400, 600, 800, 1,000, and 1,200 A
|Fault Detection Accuracy||3% typical, 20% maximum||20% typical|
|Maximum Voltage||Up to 38 kV (L-L)|
|Latency||Fault detection (SEL-FT50) to Mirrored Bits communications output (SEL-FR12): 6 ms|
|Network Size||12 SEL-FT50 transmitters per SEL-FR12 receiver|
16 customer-selectable network IDs
|ISM Frequency Band|
902–928 MHz for United States, Canada, and Colombia
TX power: 30 dBm
902–928 MHz for Mexico
TX power: 30 dBm (21 dBm for Australia and New Zealand, 16 dBm for European Union)
Number of channels: 12
RX sensitivity: –97 dBm (–105 dBm for Australia, New Zealand, and European Union) at 1% packet error rate (PER)
Serial protocol: Mirrored Bits communications
Serial port: 9,600, 19,200, 38,400, 115,200 bps
|Typical Range||4 miles with 20 dB fade margin||4 miles with 20 dB fade margin (2 miles for European Union)|