the instantaneous element asserts, the second when the TRIP output
contact closes. Where time delayed pickup (TDPU) timers are concerned,
the time tag in the event reports may be used to determine the validity of
a TDPU timer setting. Simply subtract the latest event report time tag
from the previous event report time tag. Section 4: EVENT REPORT-
ING has further details concerning event report generation.
Programmable logic allows you to isolate individual relay elements. See
the LOGIC command description in Section 3: COMMUNICATIONS for
further details.
Programmable
Logic
Test Methods
There are two means of determining the pickup and dropout of relay elements: target lamp
illumination and output contact closure.
Testing Via Target LED Illumination
During testing you can use target lamp illumination to determine relay element status. Using
the TARGET command, set the front panel targets to display the element under test. For
example, the Zone 1 phase distance element appears in Relay Word row 1. When you type
the command
TARGET 1 <ENTER>,
the LEDs display the status of the elements in Relay
Word row 1. Thus, with Target 1 displayed, if the Zone 1 phase distance element (ZIP)
asserts, the left most LED illuminates. Using LED illumination as an indicator, you can
measure the element operating characteristics.
When the TARGET command sets the target LED output to a level other than 0 (Relay
Targets), the front panel target markings are no longer relative to illuminated LEDs and the
LEDs do not latch.
If you place the relay in service with the target level other than Level 0, it automatically
reverts to target Level 0 when an automatic message transmits to a timed out port. While this
feature prevents confusion among station operators and readers, it can be inconvenient if the
relay tester does not want targets to revert to Level 0. Targets remain in the specified level if
you set timeout setting equal to 0 for the communications ports selected by the AUTO setting.
This prevents automatic message transmission to a port which may be timed out.
Testing Via Output Contact Assertion
To test using this method, set one programmable output contact to assert when the element
under test picks up. With the LOGIC command, set a 1 in the mask for the element under
test. Set all other elements in that mask to 0.
For an "a" contact, when the condition asserts, the output contact closes. When the condition
deasserts, the output contact opens. For a "b" contact, when the condition asserts, the output
7-2Maintenance & Testing
SEL-221F, -1 Instruction Manual
Date Code 920508
Summary of Contents for SEL-221F
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Page 110: ...Example Event Report 2 4 12 Event Reporting SEL 221F 1 Instruction Manual Date Code 930830 ...
Page 158: ...SETTINGS SHEET FOR SEL 221F RELAY PAGE 2 OF 6 DATE Date Code 921110 ...
Page 160: ...SETTINGS SHEET PAGE 4 OF 6 FOR SEL 221F RELAY DATE Date Code 930601 ...
Page 161: ...SETTINGS SHEET PAGE 5 OF 6 FOR SEL 221F RELAY DATE Date Code 961208 ...
Page 229: ...SEL 200 Series Relay Main Board Troubleshooting Test Points and Jumper Locations ...