+dj
-dj
V-Bus
V-Line operation
V-Bus
No operation
en05000551_ansi.vsd
ANSI05000551 V1 EN
Figure 53: Test of phase difference
3. Change the phase angle between +dφ and -dφ and verify that the two outputs are
activated for phase differences between these values but not for phase differences
outside, see figure
53.
Testing the frequency difference
The frequency difference test should verify that operation is achieved when the FreqDiffA
and FreqDiffM frequency difference is lower than the set value for manual and auto
synchronizing check, FreqDiffA and FreqDiffM respectively and that operation is blocked
when the frequency difference is greater.
Test with frequency difference = 0 mHz
Test with a frequency difference outside the set limits for manual and auto synchronizing
check respectively.
1. Apply voltages V-Line equal to 100% GblBaseSelLine and V-Bus equal to 100%
GblBaseSelBus, with a frequency difference equal to 0 mHz and a phase difference
lower than the set value.
2. Check that the AUTOSYOK and MANSYOK outputs are activated.
3. Apply voltage to the V-Line equal to 100% GblBaseSelLine with a frequency equal
to 50 Hz and voltage V-Bus equal to 100% GblBaseSelBus, with a frequency outside
the set limit.
4. Check that the two outputs are not activated. The test can be repeated with different
frequency values to verify that the function trips for values lower than the set ones.
If a modern test set is used, the frequency can be changed continuously.
Testing the reference voltage
1. Use the same basic test connection as in figure
51.
1MRK 504 165-UUS - Section 11
Testing functionality by secondary injection
Transformer protection RET670 2.2 ANSI 241
Commissioning manual
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