P.3.263
Date Code 20151029 Protection Manual SEL-411L Relay
Protection Functions
87L Communication and Timing
Figure 3.177 Two Terminal Serial Application using Redundant Channels
The relay can be ordered with combinations of up to two of the serial channel
interfaces listed in Table 3.129 for use in hot-standby two-terminal
applications or three terminal applications. Each channel interface is
independent and separately configured.
Enable 87L Channels
The Enable 87L Channel setting determines the number of relays (terminals) that
will be used in the application and which communications ports will be used.
The range of this setting is dynamic and depends on the hardware
configuration. For instance, if the relay is equipped with a single serial card
and no Ethernet card, then options 2SS and 3SS will be available. If the relay
is equipped with two serial cards and no Ethernet card, then options 2SS, 2SD,
3SS and 3SM will be available. If the relay is equipped with an Ethernet card
but no serial cards, then options 2E, 3E, and 4E will be available. If the relay is
configured with one serial card and an Ethernet card, then options 2SS, 3SS,
2E, 3E, and 4E will be available. If the relay is configured with two serial
cards and an Ethernet card, then 2SS, 2SD, 3SS, 3SM, 2E, 3E, and 4E will be
available.
If E87CH is set to N, the relay will ignore all data received on the port and not
transmit any 87L data over 87L channel.
Serial Interfaces
The following settings apply to serial communication applications.
Use the 87PCH setting to specify the primary channel when the relay has two
serial ports.
Relay (1)
SEL ICON
Multiplexer (1)
C37-94 Fiber
SONET Ring
Direct Fiber
Relay (2)
SEL ICON
Multiplexer (2)
C37-94 Fiber
NOTE: The relay can also be
ordered with any serial
card/Ethernet card combination.
However, serial and Ethernet 87L
communications are mutually
exclusive, i.e., you cannot configure a
serial port as a redundant port for an
Ethernet port. Vice versa, you
cannot configure an Ethernet port as
a redundant port for a serial port.
Table 3.130 Enable 87L Channel Settings
Setting Description Range Default
E87CH
Enable 87L
Channel
N Function disabled
N
2SS Two-terminal serial application using a sin-
gle channel
2SD Two-terminal serial application using dual
redundant channels
3SS Three-terminal serial application where the
local relay is an outstation
3SM Three-terminal serial application where the
local relay is a master
2E Two-terminal Ethernet application
3E Three-terminal Ethernet application
4E Four-terminal Ethernet application
NOTE: If the relay is equipped with
an Ethernet card, changing the 87L
settings (SET P 87) will cause any
active Ethernet sessions to
disconnect.
Table 3.131 Primary Serial Channel Setting
Setting Description Range Default
87PCH 87L primary serial channel 1,2 1
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