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Section 11
Testing functionality by secondary injection
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 50.
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.
11.10.1.3
Testing the energizing check
During the test of the energizing check function for a single bay arrangement, these voltage inputs
are used:
U-Line
U-Bus
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.
The test shall be performed according to the settings for the station. Test the alternatives below that
are applicable.
Testing the dead line live bus (DLLB)
The test should verify that the energizing check function operates for a low voltage on the U-Line and
for a high voltage on the U-Bus. This corresponds to the energizing of a dead line to a live bus.
1.
Apply a single-phase voltage 100% GblBaseSelBus to the U-Bus, and a single-phase voltage
30% GblBaseSelLine to the U-Line.
2.
Check that the AUTOENOK and MANENOK outputs are activated after set tAutoEnerg
respectively tManEnerg.
3.
Increase the U-Line to 60% GblBaseSelLine and U-Bus to be equal to 100% GblBaseSelBus.
The outputs should not be activated.
4.
The test can be repeated with different values on the U-Bus and the U-Line.
Testing the dead bus live line (DBLL)
The test should verify that the energizing check function operates for a low voltage on the U-Bus and
for a high voltage on the U-Line. This corresponds to an energizing of a dead bus to a live line.
208
UL1, UL2 or UL3 line1 voltage inputs on the IED
Bus voltage input on the IED
© 2017 - 2022 Hitachi Energy. All rights reserved
1MRK 505 378-UEN Rev. K
Line differential protection RED670
Commissioning manual
M2377-249 v5
M2377-262 v6
M2377-271 v6
M2377-276 v7
M2377-289 v8
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