ABB RET670 Commissioning Manual page 236

Section 11
Testing functionality by secondary injection
230
Testing the voltage difference
Set the voltage difference to 0.15 p.u. on the local HMI, and the test should check
that operation is achieved when the voltage difference UDiffSC is lower than 0.15
p.u.
The settings used in the test shall be final settings. The test shall be adapted to site
setting values instead of values in the example below.
Test with no voltage difference between the inputs.
Test with a voltage difference higher than the set UDiffSC.
1. Apply voltages U-Line (for example) = 80% GblBaseSelLine and U-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 operates within the set UDiffSC. Check with both U-Line and U-Bus
respectively lower than the other.
4. Increase the U-Bus to 110% GblBaseSelBus, and the U-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 U-Line (for example) = 100% GblBaseSelLine and U-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 operates for values lower than the set ones, PhaseDiffM and
PhaseDiffA. By changing the phase angle on the voltage connected to U-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 operate for other
values. See figure 53.
1MRK 504 165-UEN A
Transformer protection RET670 2.2 IEC
Commissioning manual
M2377-194 v8
M2377-215 v8