ABB RET670 Commissioning Manual page 246

Section 11
Testing functionality by secondary injection
240
1. Apply voltages V-Line (for example) = 80% GblBaseSelLine and V-Bus = 80%
GblBaseSelBusGblBaseSelBus with the same phase-angle and frequency.
2. Check that the AUTOSYOK and MANSYOK outputs are activated.
3. The test can be repeated with different voltage values to verify that the function trips
within the set VDiffSC. Check with both V-Line and V-Bus respectively lower than
the other.
4. Increase the V-Bus to 110% GblBaseSelBus, and the V-Line = 90% GblBaseSelLine
and also the opposite condition.
5. Check that the two outputs for manual and auto synchronism are not activated.
Testing the phase angle difference
The phase angle differences PhaseDiffM and PhaseDiffA respectively are set to their final
settings and the test should verify that operation is achieved when the phase angle
difference is lower than this value both leading and lagging.
Test with no voltage difference.
1. Apply voltages V-Line (for example) = 100% GblBaseSelLine and V-Bus = 100%
GblBaseSelBus, with a phase difference equal to 0 degrees and a frequency
difference lower than FreqDiffA and FreqDiffM.
2. Check that the AUTOSYOK and MANSYOK outputs are activated.
The test can be repeated with other phase difference values to verify that the function
trips for values lower than the set ones, PhaseDiffM and PhaseDiffA. By changing
the phase angle on the voltage connected to V-Bus, between ± dφ degrees, the user
can check that the two outputs are activated for a phase difference lower than the set
value. It should not trip for other values. See figure 53.
1MRK 504 165-UUS -
Transformer protection RET670 2.2 ANSI
Commissioning manual