Sel 411L - Page 72

P.2.10
SEL-411L Relay Protection Manual Date Code 20151029
Installation
Shared Configuration Attributes
IRIG-B Pins of Serial Port 1
This IRIG-B input is capable of regular IRIG mode timekeeping only. Timing
accuracy for the IRIG time mode is 500 µs.
IRIG-B BNC Connector
This IRIG-B input is capable of both modes of timekeeping. If the connected
timekeeping source is qualified as high-accuracy, the relay enters the HIRIG
mode, which has a timing accuracy of 1 µs. If both inputs are connected, the
relay uses the IRIG-B signal from the BNC connection (if a signal is
available).
Battery-Backed Clock
If relay input power is lost or removed, a lithium battery powers the relay
clock, providing date and time backup. The battery is a 3 V lithium coin cell,
Ray-O-Vac

No. BR2335 or equivalent. If power is lost or disconnected, the
battery discharges to power the clock. At room temperature (25°C), the battery
will operate for approximately 10 years at rated load.
When the relay is operating with power from an external source, the
self-discharge rate of the battery only is very small. Thus, battery life can
extend well beyond the nominal 10-year period because the battery rarely
discharges after the relay is installed. The battery cannot be recharged.
Figure 2.15 shows the clock battery location (at the front of the main board).
If the relay does not maintain the date and time after power loss, replace the
battery (see Replacing the Lithium Battery).
Communications
Interfaces
The relay has several communications interfaces you can use to communicate
with other IEDs (intelligent electronic devices) via EIA-232 ports: PORT 1,
PORT 2, PORT 3, and PORT F. See Section 1: Communications Interfaces in the
Communications Manual for more information and options for connecting
your relay to the communications interfaces.
An optional Ethernet card provides Ethernet capability for communication as
well as line current differential protection. An Ethernet card gives the relay
access to popular Ethernet networking standards including TCP/IP, FTP,
Telnet, DNP3, and IEC 61850 over local area and wide area networks (the
Ethernet card with IEC 61850 support is available at purchase as a
factory-installed option). For information on DNP3 applications, see
Section 4: DNP3 Communications in the Communications Manual. For more
information on IEC 61850 applications, see Section 5: IEC 61850
Communications in the Communications Manual.
The relay supports two general types of channel for line current differential
communications: serial and Ethernet. See 87L Communication and Timing on
page P.3.261 for more information and options for connecting your relay to
support line current differential communication interfaces.
Other Shared
Configuration
Attributes
All versions of the relay also feature ground, power, and battery monitor
connections. See Connection for information on these relay interface features.