Reles De Distancia

SEL-9220
Fiber-Optic Adapter for SEL-300 Series Relays

Expand Communications for SEL-300 Series Relays

Convert EIA-485 port to fiber-optic link.

Add a Fiber-Optic Link for Data
and Time Code to EIA-485 Port.
GPS Clock
SEL-2407

IRIG-B
SEL RTAC
SEL-2812MT

SEL-3530

Features and Benefits
■ Accomplish More With a Third Serial Link

For applications that do not use anEIA-485 network, convert the
EIA-485 port of an SEL-300 series relay to a fiber-optic port that
is the equivalent of an SEL-2812MR Fiber-Optic Transceiver. For
example, connect an SEL-300G Generator Relay to an SEL-2600 RTD
Module, an SEL-2664 Field Ground Module, and an SEL-3530 RealTime Automation Controller (RTAC). Or, add I/O to an SEL distance
or feeder relay via an SEL-2505 Remote I/OModule.
■ Easily Apply

Connects directly to the Port 1 connector with positive retention
screws. Full-duplex serial data and IRIG-B time synchronization are
provided via the connector. Attach with duplex optical fiber to an
SEL-2812MT Fiber-Optic Transceiver at the other end of the link.
■ Increase Safety and Signal Integrity

Bidirectional Data Plus
Time Synchronization
With Two OpticalFibers

Isolate devices from ground potential rise and electrical
interference through the communications connections, using an
eye-safe, Class 1 laser product per EN 60825-1.
SEL9220

Relay
Data plus time synchronization.

Making Electric Power Safer, More Reliable, and More Economical ®

Application Information
Example
Fiber Type . . . . . . . . . . . . . . . . . . . . . . . 50 μmConnecting and Disconnecting Fiber Cable
Use the supplied connector caps to cover ST® connectors that
are not connected to a fiber cable to prevent reflected light from
appearing as a received message.

Splice Loss (fusion) . . . . . . . . . . . . . . . 0.2 dB/Splice
Fiber Loss @ 850 nm . . . . . . . . . . . . . . 2.7 dB/km

Determining Maximum Cable Length
The table to the rightshows maximum cable lengths based on
typical fiber loss. The optical power budget includes transmit and
receive connector coupling loss; therefore, the maximum cable
length is determined by dividing the total optical power budget by
the typical fiber loss/km specification.

SEL-9220 Optical Budget. . . . . . . . . . . 16 dB
Less Splice Loss (1 • 0.2 dB) . . . . . . . . 0.2 dB
Available Power .. . . . . . . . . . . . . . . . . 15.8 dB
Maximum Cable Length . . . . . . . . . . . . . 15.8 dB ÷ 2.7 dB/km = 5.85 km

To calculate the maximum cable length for your application, first
ask your fiber cable supplier for fiber loss/km and connector/splice
loss specifications (over expected temperature range) based on an
850 nm wavelength optical source. Calculate the available optical
powerbudget by subtracting the total connector/splice attenuation
from the power budget specification shown in the table. Divide the
available optical power budget by the fiber loss/km specification to
determine the maximum cable length.

Cable Length
Fiber
Diameter (μm)

Typical Fiber
Loss (dB/km) at 25°C

Maximum Cable
Length (km)*

50

16

2.7

5.85

62.5

16

3.2

4.9200

SEL Substation Relay Application Example

Power Budget (dB)
(—40° to +85°C)

16

6.5

2.4

* Actual distance depends on specific optical fiber characteristics and number of splices.

One serial port connected to an SEL-3530 RTAC or other
communications processor provides interaction with the control
center, engineering department, and others. Use the remaining serialports for:
• SEL Mirrored Bits® communications with two other sites in a
three-terminal teleprotection scheme
• Distributed bus protection schemes
• Additional I/O with SEL-2505 or SEL-2506 Remote I/O Modules
• I/O and annunciation via an SEL-2523 Annunciator Panel

SEL-300G Generator Relay Example
Full generator protection and monitoring uses three serial ports.
Retrieve RTD temperature...