Sel 411L - Operating the Relay Inputs and Outputs

P.10.21
Date Code 20151029 Protection Manual SEL-411L Relay
Basic Relay Operations
Operating the Relay Inputs and Outputs
Operating the Relay Inputs and Outputs
The relay gives you great ability to perform control actions at bay and
substation locations via the relay control outputs. The control outputs close
and open circuit breakers, switch disconnects, and operate auxiliary station
equipment such as fans and lights. The relay reads data from the power system
and interfaces with external signals (contact closures and data) through the
control inputs. This subsection is an introduction to operating the relay control
outputs and control inputs. For more information on connecting and applying
the control outputs and control inputs, see Section 2: Installation.
Control Output
The relay features standard, hybrid (high-current interrupting), and high-
speed, high-current interrupting control outputs that you can use to control
circuit breakers and other devices in an equipment bay or substation control
enclosure. See Control Outputs on page P.2.6 for more information on control
outputs.
Pulsing a Control Output: Terminal
When first connecting the relay, or at any time that you want to test relay
control outputs, perform the following procedure. The procedure in the
following steps shows how to use a communications terminal to pulse the
control output contacts. Perform the steps in this example to become familiar
with relay control and serial communication. For more information on the
PULSE command, see PULSE on page P.15.42.
This example assumes that you have successfully established communication
with the relay; see Making an EIA-232 Serial Port Connection for a step-by-
step procedure. In addition, you must be familiar with relay access levels and
passwords (see Changing the Default Passwords: Terminal to change the
default access level passwords).
NOTE: To PULSE an output, t he
circuit breaker control enable jumper,
BREAKER, must be installed on the
main board.
Step 1. Prepare to control the relay at Access Level B.
a. Using a communications terminal, type ACC <Enter>.
b. Type the Access Level 1 password and press <Enter>.
You will see the Access Level 1 => prompt.
c. Type the BAC <Enter> command.
d. Type the correct password to go to Access Level B.
You will see the Access Level 1 => prompt.
Step 2. Attach an indicating device (ohmmeter with a beep sounder or
a test set) to the terminals for control output OUT204.
This output is a standard control output and is not polarity
sensitive.
For more information on connecting control outputs, see
Control Outputs on page P.2.6.