SEL-FT50/SEL-FR12 Fault Transmitter and Receiver System Accelerate Tripping, Speed Up Restoration, and Improve Safety on Distribution Feeders Major Features and Benefits The SEL-FT50/SEL-FR12 Fault Transmitter and Receiver System speeds up distribution-protection schemes by detecting and transmitting distribution feeder fault information to recloser controls or relays.
Functional Overview Functional Overview Overhead Conductor SEL-FT50 Fault Transmitter Signal and Energy Harvest Link-Check Timer Power Circuit Fault Sense Transmit Radio Receive Serial Port MIRRORED BITS Output MIRRORED BITS Encoder 12-Channel Receiver SEL-FR12 Fault Receiver The SEL-FT50/SEL-FR12 system consists of as many as twelve SEL-FT50 Fault Transmitters and one SEL-FR12 Fault Receiver. The SEL-FT50 is mounted on distribution conductors with voltages as high as 38 kV.
System Overview Distribution System Collection SEL-FT50 MIRRORED BITS SEL-651R SEL-FT-50/SEL-FR12 System Benefits • Monitor as many as 4 three-phase branches Figure 1 Protection Logic SEL-FR12 • Collect wireless signals simultaneously from as many as 12 fault transmitters 3 • • • • Speed up protection Improve power quality Protect equipment Enhance safety Protective Device SEL-FT50/SEL-FR12 System The SEL-FT50/SEL-FR12 system components are easy to use, and they contain many powerful and in
System Overview ENABLED LED MIRRORED BITS status LEDs FAULT and LINK status LEDs TARGET RESET pushbutton Radio antenna BNC connector Serial port (DB-9 connector) Figure 3 Power supply input (9–30 Vdc) Grounding lug Control (DIP) switches to select: • Network ID—SW 1–4 • Baud rate—SW 5–6 • MIRRORED BITS TX and RX ID—SW 7–10 • Near/distant SEL-FT50—SW 11–14 SEL-FR12 Overview The SEL-FR12 collects wireless signals simultaneously from as many as 12 SEL-FT50 Fault Transmitters (enough for 4 three-
Application Examples 5 ➤ The ROK, TX, RX (green), and LOOP (red) LEDs indicate MIRRORED BITS status and activity. The ROK LED illuminates when MIRRORED BITS data exchange is successful. ➤ The TARGET RESET pushbutton resets the FAULT LEDs. Press and hold the pushbutton to illuminate all HMI LEDs (lamp test function).
Application Examples SEL-FT50 SEL-FT50 SEL-FT50 R Wireless SEL-FT50 SEL-651R-2 Figure 5 SEL-FR12 Recloser Communication With Fault Transmitters Each SEL-FT50 monitors line current and instantly transmits a wireless signal when an overcurrent (fault) condition occurs. The companion SEL-FR12 receives and aggregates fault data from as many as 12 SEL-FT50 Fault Transmitters.
Application Examples 7 1,000 Fuse-Clearing Curve Fuse-Melting Curve 100 Recloser Control Slow Curve 10 Time (s) 1 0.1 Recloser Control Fast Curve 0.01 100 Figure 6 Fuse-Blowing Scheme Shortcomings 1,000 Current (A) Example Time-Overcurrent Element Coordination For a radial distribution system, the goal of the fuse-blowing scheme is to minimize the number of customers exposed to an interruption. The scheme accomplishes this by allowing a fuse to clear a given fault.
Application Examples Improve Fuse-Blowing Schemes With the Fault Transmitter and Receiver System With the SEL-FT50/SEL-FR12 system installed as shown in Figure 8, the recloser control receives an indication whenever a fault is on the unfused branch. With this information, if a fault occurs on the unfused line section, the recloser control can trip instantaneously instead of waiting for the fuse delay.
Application Examples 9 Example 2: Switchover Without Interruption From a Fuse-Saving Scheme to a Fuse-Blowing Scheme In this switchover scheme, the SEL-FT50/SEL-FR12 system is used to indicate which line section contains a fault. However, the fuse-saving scheme is the default operating mode. When the SEL-FT50 declares that a fault is present on a candidate line section, the scheme enables fuse-blowing while the fault is in progress.
Safety Information Tripping the Right Recloser Faster You can protect a distribution feeder with multiple reclosers. In a radial system, to optimize selectivity, users want the recloser closest to the fault to operate for that fault. For this reason, reclosers at the end of the distribution line are set to trip first and the close-in reclosers are set to delay their tripping. Figure 10 shows a fault in Zone R1.
Safety Information This device complies with Industry Canada license-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device. Dangers, Warnings, and Cautions 11 Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence.
System Installation WARNING AVERTISSEMENT Do not perform any procedures or adjustments that this instruction manual does not describe. CAUTION Ne pas appliquer une procédure ou un ajustement qui n’est pas décrit explicitement dans ce manuel d’instruction. ATTENTION Equipment components are sensitive to electrostatic discharge (ESD). Undetectable permanent damage can result if you do not use proper ESD procedures.
System Installation 13 performance. Use 4 mm2 (12 AWG) or heavier wire of less than 2 meters (6.6 feet) for this connection. Make the ground connection before making the power connections. Connect the power harness to a fused 12 V auxiliary power supply terminal on the SEL-651R, paying attention to polarity. If possible, turn on the SEL-FR12 and verify that the ENABLED LED illuminates. Turn it off before continuing.
System Installation configuration switches and will only accept received SEL-FT50 messages that have a matching Network ID. For example, if three distribution feeders emanate from one substation, each with their own SEL-FT50/SEL-FR12 system, these systems operate independently if they have unique Network IDs.
System Installation Figure 13 15 Serial Port Settings Selection Setting Near/Distant SEL-FT50 For three-phase installations, the SEL-FT50 Fault Transmitters are installed in groups of three, and the received signal strength from all members of a trio is identical. The received signal strength between multiple trios is usually different because of path differences. To accommodate the range of reception signal strengths, an attenuation setting is provided for each trio. See Table 3 for trio assignments.
System Installation SEL-351, SEL-751 Relays, SEL-351R, and SEL-651R Recloser Controls PROTO = MB8A* SPEED = 38400 TXID = 2 RXID = 1 * = MB8A or MB8B may be used SEL-451 Relay PROTO= MBA* SPEED = 38400 MBT = N TX_ID = 2 TX MODE = P STOPBIT = 2 RX_ID = 1 MBNUM = 8 * = MBA or MBB may be used SEL-2505/SEL-2506 Remote I/O Module SPEED = 38400 RX_ADD = 1 TX_ADD = 2 MIRRORED BITS Interface and Messages The SEL-FR12 communicates with a host device (protective relay or recloser control) through use of SEL MI
System Installation 17 The TMB1–TMB6 entries in Table 6 and Table 7 indicate the required TMB states to select the Default Set or Command Set 2 or 3. Any other bit combinations force the SEL-FR12 to return all zeros and cause it to ignore TMB7 and TMB8 commands. Table 5 Definition of FAULT and LINK Bits Bit Label Definition LINK u u = Unit ID 1–12 SEL-FR12 is receiving messages from SEL-FT50 Fault Transmitters. Asserts whenever SEL-FR12 LINK LED u is solidly illuminated.
System Installation Table 7 Detailed Command Set 3—SEL-FR12 MIRRORED BITS Data Message Contents Required SEL-651R Transmit MIRRORED BITS (SELOGIC Equations) for Detailed Command Set (2) TMB1 TMB2 TMB3 TMB4 TMB5 TMB6 TMB7 TMB8 0 0 1 1 0 0 Clear link state in SEL-FR12 Target reset on SEL-FR12 HMI RMB5 RMB6 RMB7 RMB8 LINK 10 LINK 11 LINK 12 FAULT 11 FAULT 12 SEL-651R Received MIRRORED BITS (Relay Word bits) RMB1 RMB2 RMB3 RMB4 Response During Normal Conditions (No Fault on
System Installation Figure 15 19 Switch Selections Labels Setting the Unit ID The SEL-FR12 Fault Receiver receives wireless signals from as many as 12 SEL-FT50 Fault Transmitters on the same network, defined by the Network ID selection in the SEL-FT50/SEL-FR12 system. To allow the SEL-FR12 to distinguish which fault transmitter has sent a message, each SEL-FT50 transmits a Unit ID field as part of the message (the Unit ID is a number from 1 to 12).
System Installation Follow the guidelines in the following table to ensure the right pickup levels while avoiding false pickups. Table 8 NOTE: The SEL-FT50 current measurement circuitry is not as precise as a protective relay overcurrent element. Refer to Specifications on page 25 for fault pickup accuracy, response characteristics, and device ratings.
System Installation 21 d b Figure 16 Fresnel Zone The formula used to calculate the widest distance of the Fresnel zone is as follows: b = 17.32 d e 4f where: b = radius of the Fresnel zone in meters d = distance between transmitter and receiver in kilometers f = frequency transmitted in GHz Table 9 900-MHz Fresnel Zone Radius Distance Between Antennas (d) Fresnel Zone Radius (b) Free-Space Loss (dB) 304.8 m (1000 ft) 4.9 m (16 ft) 81 1.6 km (1 mi) 11.6 m (38 ft) 96 8 km (5 mi) 25.
System Installation while a fade margin of 15 dB yields good radio performance for critical communications links. Site Survey. A line-of-sight path provides the most reliable transmission in all cases. As the distance increases, the need for a clear path becomes more critical in creating a reliable, available radio link. If you have a clear line-ofsight to the other location without obstructions to the Fresnel zone (see Radio Path on page 20) then a path study is generally not needed.
Dimensions 23 Step 3. Apply slight upward pressure until the device is secured around the line as shown in Figure 19. Figure 19 SEL-FT50 Secure on the Line Step 4. Use the hot stick to adjust the transmitter orientation so that it is directly vertical. This is important to ensure the best propagation characteristics for the internal antenna. Dimensions 2.47 (62.74) 5.83 (148.08) 4.75 (120.55) Figure 20 Date Code 20170317 5.71 (145.
Dimensions Figure 21 SEL-FR12 Dimensions SEL-FT50/SEL-FR12 Fault Transmitter and Receiver System Instruction Manual Date Code 20170317
Specifications 25 Specifications Maximum Voltage Compliance Designed and manufactured under an ISO 9001 certified quality management system.
Appendix A: Manual Versions Appendix A: Manual Versions Instruction Manual The date code at the bottom of each page of this manual reflects the creation or revision date. Table 10 lists the instruction manual versions and revision descriptions. The most recent instruction manual version is listed first. Table 10 Instruction Manual Revision History Date Code 20170317 Summary of Revisions ➤ Initial version.
Appendix B: Two Branch Application 27 Appendix B: Two Branch Application Two Branch Application This application has two three-phase branches, A and B, as shown in Figure 22. Branch B has a fuse and uses a fuse-blowing scheme, while Branch A does not. When a fault occurs on Branch A, the recloser operates to clear the fault.
Appendix B: Two Branch Application Table 12 Settings for the SEL-FR12 Network ID BAUD RX_ADD TX_ADD Trio 1 Distance 3—(0010) 38400 1 2 > 300 m (1000 ft) > 300 m (1000 ft) > 300 m (1000 ft) > 300 m (1000 ft) Table 13 Table 14 Trio 2 Distance Trio 3 Distance Trio 4 Distance SEL-651R Settings PROTO SPEED TXID RXID MB8A or MB8B 38400 1 2 SEL-651R Transmit MIRRORED BITS Settings TMB1A TMB2A TMB3A TMB4A TMB5A TMB6A TMB7A TMB8A Comments 0 0 0 0 0 0 0 TRGTR The TARGE
Appendix B: Two Branch Application © 2017 by Schweitzer Engineering Laboratories, Inc. All rights reserved. All brand or product names appearing in this document are the trademark or registered trademark of their respective holders. No SEL trademarks may be used without written permission. SEL products appearing in this document may be covered by U.S. and Foreign patents. 2350 NE Hopkins Court • Pullman, WA 99163-5603 U.S.A. Tel: +1.509.332.1890 • Fax: +1.509.332.7990 selinc.com • info@selinc.
