The SEL Fault Transmitter and Receiver System provides an innovative approach for speeding up distribution protection schemes without sacrificing selectivity. Apply this system with your existing protection schemes to eliminate the need for coordination delays between fuses and protective relays. The system includes line-powered SEL-FT50 Fault Transmitters communicating wirelessly with an SEL-FR12 Fault Receiver over 4 miles. The system communicates the fault data using high-speed Mirrored Bits communications to any SEL device—in less than 6 ms.
Fast detection and communications enable coordination tailored to specific events. This allows you to trip on faults as fast as possible and to selectively decide when reclosing should be enabled, thus improving safety and reducing wear on equipment. Install the SEL-FT50 Fault Transmitters on laterals, branches, and the main line to provide additional information for protection decisions. When combined with the SEL-651R Advanced Recloser Control or other SEL distribution protection relays, the SEL Fault Transmitter and Receiver System makes new protection schemes possible.
SEL-FT50 Fault Transmitter: 150 USD
SEL-FR12 Fault Receiver: 450 USD
Disable Reclosing for Underground Faults—Knowing whether a fault is on an overhead or underground section of a feeder can be very useful in coordinating reclosing and protection schemes. A set of SEL-FT50 Transmitters can be used to enable reclosing when the fault is on the overhead portion of the feeder.
Tailor Fuse Coordination—Trip fast for main-line faults, and combine fuse-saving and fuse-blowing schemes on the same feeder. Adapt your coordination based on the SEL-FT50 fault information from laterals, branches, and the mainline.
Extend the Range to 20 Miles With SEL-3031 Serial Radio Transceivers—SEL-3031 Radios typically add less than 5 milliseconds of latency for control commands using Mirrored Bits communications.
Using fault information from the SEL-FT50 Fault Transmitters, the SEL-651R is able to make faster and more intelligent protection decisions, clearing mainline faults without waiting for fuse coordination on branch circuits or waiting for delay tripping for a fuse-blowing scheme on a lateral.
Think Milliseconds, Not Seconds
By providing individual branch inputs, the SEL Fault Transmitter and Receiver System allows you to engineer faster protection schemes that permit SEL distribution relays or recloser controls to make better decisions about tripping and reclosing. The SEL Fault Transmitter and Receiver System is an economical way to improve speed, selectivity, and safety on distribution feeders by providing adaptive coordination for any event.
Reduce Operation and Maintenance Costs
Stretch your budget and get more from your power system assets. Because faults are identified fast, the fault current duration is shortened, reducing operation and maintenance costs by extending the useful life of equipment. Implementing fuse-saving schemes results in fewer truck rolls, fewer fuse replacements, and lower operation costs.
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 line. The system has just a few settings, all set via control (DIP) switches. In fact, the entire system can be installed and configured without using a computer. The SEL-FT50 is rugged and line-powered, providing maintenance-free operation.
Wireless Area Coverage Study
SEL provides a wireless fault transmitter study free of charge for the planned use of an SEL Fault Transmitter and Receiver System. Customers provide location information for the SEL-FR12, and the study identifies viable areas to install SEL-FT50 Transmitters. For larger studies, SEL offers a service for a fee through SEL Engineering Services.
The SEL-FT50/FR12 system is approved for use by the 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.
|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)||0.3" to 1.1"|
|Power System Frequency Range||45–65 Hz|
|Current Pickup Level|
|Fault Detection Accuracy||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
902–928 MHz ISM band
|Typical Range||4 miles with 20 dB fade margin|
Contact SEL to conduct a free path study.