Date Code 20010731 Testing and Troubleshooting 11-17
SEL-352-1, -2 Instruction Manual
Setting Elements
59H, 59L,
25SC, 25AC
25C, 25T
59H, 59L,
25SM, 25AM
25M, 25T
3. Apply a voltage to the X-voltage input that is greater than the 59L setting but less
than the 59H setting. Set the angle to 0 and the frequency to your nominal
frequency.
4. Apply a voltage to the Y-voltage input that is greater than the 59L setting. Set the
angle to 0 and the frequency to your nominal frequency. The 25C, 25M, and 25T
elements should all assert, illuminating the corresponding target LEDs.
5. Increase or decrease the angle of the Y-voltage input until the element under test
deasserts (LED extinguishes). The 25T will only deassert after both 25M and 25C
have dropped out. Record the results.
6. Verify the results with the indicated 25AC or 25AM setting.
7. Apply a voltage to the Y-voltage input that is greater than the 59L setting. Set the
angle to 0 and the frequency to your nominal frequency. The 25C, 25M, and 25T
elements should all assert, illuminating the corresponding target LEDs.
8. Increase or decrease the frequency of the Y-voltage input until the element under
test deasserts (LED extinguishes). Record the results.
9. Verify the results with the indicated 25SC or 25SM setting. These settings are in
slip (cycles/sec), which is the difference between the two source frequencies.
FAULT CURRENT BREAKER FAILURE, SCHEME 1 LOGIC TEST
Purpose: Verify operation of the Scheme 1 fault current breaker failure logic (Reference:
Figure 3.6).
Method: 1. While the relay is capable of employing five different fault current breaker failure
schemes, only one is enabled at a time. Select Scheme 1 by setting FTLOG = 1 in
the relay setting group. Using the SET command, set an output to close when the
FBF element asserts, and set the SER to trigger for the TRIPA, 50FT, and FBF
elements. Verify the settings with the SHO command, and the SHO G command
for TRIPA.
Setting
Elements
FTLOG, 50FT,
FCpu, TTdo
TRIPA
50FT, FBF
To Next Page
