P.3.264
SEL-411L Relay Protection Manual Date Code 20151029
Protection Functions
87L Communication and Timing
If a relay has two serial ports in a 2SS or 3SS application, this setting specifies
which of the two ports will be used for the 87L function. In a 2SD application,
this setting specifies which channel will be used when both channels are
healthy (i.e., the primary channel).
Use the settings in Table 3.132 in a 2SD application to create a user-defined
condition to mark a channel as problematic and request a switch-over to the
other channel. The use of these settings is anticipated only in unusual circumstances.
NOTE: If setting of 87TADR,
87R1ADR, and 87R2ADR is through
use of a terminal emulation program
and not through use of
ACSELERATOR
QuickSet
®
SEL-5030 Software, be
sure to configure the settings to
unique addresses (unless
E87CH = 2SD, in which case 87R1ADR
and 87R2ADR are identical).
The settings in Table 3.133 are used to ensure that the local relay is
exchanging data with the intended remote relay(s). The setting 87TADR
specifies the address of the local relay. Each relay in the immediate power
system should be set with a unique address. The setting 87R1ADR specifies
the expected addresses of the remote relay connected to Port 1 and 87R2ADR
specifies the expected addresses of the remote relay connected to Port 2. If the
actual address of a remote relay on a particular port does not match the
corresponding remote address setting then the 87L function is inhibited.
NOTE: The 87L transmit equations
will be located in both the Group and
the Port 87 settings, and 87L
Communication bits will be located in
both the Group and Output settings
when E87PG = P. However, only the
settings in the Port 87 settings are
functional. When E87PG = G, the
settings in the Port 87 and Output
settings will be hidden and only visible
in the Group settings. Using
A
CSELERATOR QuickSet SEL-5030
software will gray out the settings if
they are nonfunctional and can help
ensure correct implementation of this
protocol.
Set the Port 87 setting E87PG = P to use the 87L Port settings, or set the Port
setting E87PG = G to use the Group settings to set the 87L transmit equations.
Setting E87PG = G will allow the 87L transmit and receive settings, Table 3.133,
and Transmit equations to transfer with a Group Switch when it occurs. In
addition, the 87L Communication bits will be located in the Group settings if
E87PG = G instead of the original location of the Output settings. For more
information see MBG Protocol on page C.2.12.
The setting in Table 3.134 enables the relay to use the 87L serial channel as a
virtual terminal to remotely access a connected SEL-411L. Once this setting is
enabled the PORT BAY1 or PORT BAY2 commands can be used to set up
the virtual terminal (see PORT on page P.15.41). This setting must be set to Y in
both the local and remote relays prior to establishing a virtual terminal connection.
EIA-422 Interface
EIA-422 is an industry standard which describes an electrical interface which
uses two balanced pairs, one for transmission and one for reception. A
separate ground wire is included and the pairs may be shielded. The interface
Table 3.132 Channel Out of Service Settings
Setting Description Range Default
ECH1OUT Enable Channel 1 out of service
SEL
OGIC equation NA
ECH2OUT Enable Channel 2 out of service
Table 3.133 Relay Address Settings
Setting Description Range Default
E87PG
a
a
E87PG is not available when E87CH = 2E, 3E, or 4E.
87L Port Address Location G = Group, P = Port G, P P
87TADR Relay transmit address 1–255 1
87R1ADR Channel 1 receive address 1–255 2
87R2ADR Channel 2 receive address 1–255 3
Table 3.134 Virtual Terminal Over Serial Channel
Setting Description Range Default
E87VT Enable virtual terminal over 87L
serial channel
Y, N N
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