ABB RED670 - Page 231

+dj
-dj
U-Bus
U-Line operation
U-Bus
No operation
en05000551.vsd
IEC05000551 V1 EN-US
Figure 51: 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
51.
Testing the frequency difference
M2377-232 v9
The frequency dif
ference test should verify that operation is achieved when the
Fr
eqDiffA 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 U-Line equal to 100% GblBaseSelLine and U-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 U-Line equal to 100% GblBaseSelLine with a frequency
equal to 50 Hz and voltage U-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 operates for values lower
than the set ones. If a modern test set is used, the frequency can be changed
continuously.
Testing the reference voltage
M2377-249 v5
1. Use the same basic test connection as in figure
49.
1MRK 505 378-UEN A Section 11
Testing functionality by secondary injection
Line differential protection RED670 2.2 IEC 225
Commissioning manual