P.2.36
SEL-411L Relay Protection Manual Date Code 20151029
Installation
Connection
TIME Input Connections
IRIG-B Input Connection
The relay accepts a demodulated IRIG-B signal through two types of
rear-panel connectors. These IRIG-B inputs are through the BNC connector
labeled TIME IRIG-B or through Pin 4 (+) and Pin 6 (–) of the rear-panel 9-pin
D-subminiature connector PORT 1 (see Communication Ports for other DB-9
connector pinouts and additional details).
These inputs accept the dc shift time code generator output (demodulated)
IRIG-B signal with positive edge on the time mark. For more information on
IRIG-B and the relay, see TIME Inputs.
The PORT 1 IRIG-B input connects to a 2.5 k grounded resistor and goes
through a single logic signal buffer. The PORT 1 IRIG-B is equipped with robust
ESD and overvoltage protection but is not optically isolated. When you are
using the PORT 1 input, ensure that you connect Pins 4 and 6 with the proper
polarity.
Where distance between the relay and the IRIG-B sending device exceeds the
cable length recommended for conventional EIA-232 metallic conductor
cables, you can use transceivers to provide isolation and to establish
communication to remote locations.
Conventional fiber-optic and telephone modems do not support IRIG-B signal
transmission. Use the SEL-2810 transceiver to provide long distance delivery
of the IRIG-B signal to the relay. The SEL-2810 includes a channel for the
IRIG-B time code. These transceivers enable you to synchronize time
precisely from IRIG-B time code generators (such as the SEL-2032
Communications Processor) over a fiber-optic communications link.
Use the IRIG-B BNC connector for synchrophasor and high-accuracy
timekeeping applications—see Configuring High-Accuracy Timekeeping on
page P.13.1. Make the connection using a 50 coaxial cable assembly with a
male BNC connector.
Replacing the Lithium
Battery
You can replace a bad lithium battery in the relay. Perform the following steps
to replace the lithium battery.
Step 1. Follow your company standard procedure to remove a relay
from service.
Step 2. Disconnect power from the relay.
Step 3. Remove the relay from the rack or panel.
Step 4. Retain the GND connection, if possible, and ground the
equipment to an ESD mat.
Step 5. Remove the communications cable connected to the front-panel
serial port, if applicable.
Step 6. Loosen the four front-panel screws (they remain attached to the
front panel), and remove the relay front panel.
Step 7. Remove the top cover of the relay (unscrew the seven screws).
Step 8. Locate the lithium battery (see Figure 2.15).
Step 9. Remove the spent battery from beneath the clip of the battery holder.
Disconnect or de-energize all external
connections before opening this
device. Contact with hazardous
voltages and currents inside this
device can cause electrical shock
resulting in injury or death.
Have only qualified personnel service
this equipment. If you are not qualified
to service this equipment, you can
injure yourself or others, or cause
equipment damage.
Equipment components are sensitive
to electrostatic discharge (ESD).
Undetectable permanent damage can
result if you do not use proper ESD
procedures. Ground yourself, your
work surface, and this equipment
before removing any cover from this
equipment. If your facility is not
equipped to work with these
components, contact SEL about
returning this device and related SEL
equipment for service.
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