P.2.33
Date Code 20151029 Protection Manual SEL-411L Relay
Installation
Connection
Secondary Circuit
Connections
The relay has two sets of three-phase current inputs and two sets of
three-phase voltage inputs. Shared Configuration Attributes describes these
inputs in detail. The alert symbol and the word DANGER on the rear panel
indicate that you should use all safety precautions when connecting secondary
circuits to these terminals.
You can review metering data in an event report that results when you issue
the TRIGGER command (see Triggering Data Captures and Event Reports
on page P.8.4).
Fixed Terminal Blocks
Connect the secondary circuits to the Z terminal blocks on the relay rear panel.
Note the polarity dots above the odd-numbered terminals #Z01, #Z03, #Z05,
#Z07, #Z09, and #Z11 for CT inputs. Similar polarity dots are above the
odd-numbered terminals #Z13, #Z15, #Z17, #Z19, #Z21, and #Z23 for PT inputs.
Connectorized
For the Connectorized SEL-411L, order the wiring harness kit, SEL-WA0421.
The wiring harness contains four prewired connectors for the relay current and
voltage inputs. You can order the wiring harness with various wire sizes and
lengths. Contact your local Technical Service Center or the SEL factory for
ordering information.
Perform the following steps to install the wiring harness:
Step 1. Plug the CT shorting connectors into terminals #Z01–#Z06 for
the IW inputs, and #Z07–#Z12 for the IX inputs, as appropriate.
Odd-numbered terminals are the polarity terminals.
Step 2. Secure the connector to the relay chassis with the two screws
located on each end of the connector.
When you remove the CT shorting connector, pull straight
away from the relay rear panel. As you remove the connector,
internal mechanisms within the connector separately short each
power system current transformer.
You can install these connectors in only one orientation.
Step 3. Plug the PT voltage connectors into terminals #Z13–#Z18 for the
VY inputs, and #Z19–#Z24 for the VZ inputs, as appropriate.
Odd numbered terminals are the polarity terminals. You can
install these connectors in only one orientation.
Control Circuit
Connections
You can configure the relay with many combinations of control inputs and
control outputs. See I/O Interface Boards for information about I/O
configurations. This subsection provides details about connecting these
control inputs and outputs.
Control Inputs
NOTE: The combined voltages
applied to the INnnn and OUTnnn
terminals must not exceed 600 V (rms
or dc).
Table 2.2 lists the control inputs available with the relay.
Relay misoperation can result from
applying unspecified secondary
voltages and currents. Before making
any secondary circuit connections,
check the nominal voltage and
nominal current specified on the
rear-panel nameplate.
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