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 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
1.
Use the same basic test connection as in figure
The voltage difference between the voltage connected to U-Bus and U-Line
should be 0%, so that the AUTOSYOK and MANSYOK outputs are activated
first.
2.
Change the U-Line voltage connection to U-Line2 without changing the setting
on the local HMI. Check that the two outputs are not activated.
6.9.1.3
Testing the energizing check
During the test of the energizing check function for a single bay arrangement, these
voltage inputs are used:
U-Line
UL1, UL2 or UL3 line1 voltage inputs on the IED
U-Bus
Bus voltage input on the IED
General
When testing the energizing check function for the applicable bus, arrangement shall
be done for the energizing check functions. The voltage is selected by activation of
different inputs in the voltage selection logic.
Live voltage level is fixed to 80%
UBase
and dead voltage level to fixed 40%
UBase
.
Section 6
1MRK 502 049-UEN A
Testing functionality
104
Commissioning manual
