13.7
Date Code 20060320 Instruction Manual SEL-311C Relay
Testing and Troubleshooting
Testing Methods and Tools
Testing Via Front-Panel Indicators
Display the state of relay elements, inputs, and outputs by using the front-
panel or serial port TAR commands. Use this method to verify the pickup
settings of protection elements.
Access the front-panel TAR command from the front-panel {OTHER}
pushbutton menu.
Step 1. To display the state of the 51PT element on the front-panel
display, press the {OTHER} pushbutton.
Step 2. Move your cursor to the
TAR option, and press {SELECT}.
Step 3. Press the up arrow pushbutton until
TAR 28 is displayed on the
top row of the LCD.
The bottom row of the LCD displays all elements asserted in
Relay Word Row 28. The relay maps the state of the elements
in Relay Word Row 28 on the bottom row of LEDs. The 51PT
element state is reflected on the LED labeled B. See
Table 10.10 for the correspondence between the Relay Word
elements and the TAR command.
Step 4. To view the 51PT element status from the serial port, issue the
TAR 51PT command.
The relay will display the state of all elements in the Relay
Word row containing the 51PT element.
Review TAR command descriptions in Section 10: Serial Port
Communications and Commands and Section 11: Front-Panel Interface (Only
on Models With LCD) for further details on displaying element status via the
TAR commands.
Testing Via Output Contacts
You can set the relay to operate an output contact for testing a single element.
Use the SET L command (SEL
OGIC control equations) to set an output
contact (e.g., OUT101–OUT108 for Model 0311C00x) to the element under test.
The available elements are the Relay Word bits referenced in Tab le 9.5 and
Table 9.6.
Use this method especially for time testing time-overcurrent elements. For
example, to test the phase time-overcurrent element 51PT via output contact
OUT104, make the following SEL
OGIC setting:
OUT104 = 51PT
Time-overcurrent curve and time-dial information can be found in Section 9:
Setting the Relay. Do not forget to reenter the correct relay settings when you
are finished testing and are ready to place the relay in service.
Testing Via Sequential Events Recorder
You can set the relay to generate an entry in the Sequential Events Recorder
(SER) for testing relay elements. Use the SET R command to include the
element(s) under test in any of the SER trigger lists (SER1–SER3). See
Section 12: Standard Event Reports and SER.
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