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15
15.1
15.2
Supervision of AC input quantities (DA)
Supervision of AC input quantities (DA)
Stabilized ac current and voltage generators and corresponding current, voltage, power and fre-
quency meters with very high accuracy are necessary for testing the alternating quantity mea-
suring function. The operating ranges of the generators must correspond to the rated alternate
current and voltage of each terminal.
Prepare the terminal for verification of settings as outlined in
chapter.
Connect the generators and instruments to the corresponding input terminals of a unit
under test.
Verifying the settings
Procedure
1.
Supply the terminal with voltages and currents.
Check that the values presented on the HMI unit correspond to the mag-
nitude of input measured quantities within the limits of declared accura-
cy. The mean service values are available under the submenu:
Service Report/ServiceValues
The phasors of up to five input currents and voltages are available under
the submenu:
Service Report/Phasors/Primary
2.
Check the operation of ADBS or IDBS when applicable. Compare
with the expected values.
The operation of ADBS or IDBS function can be checked separately with
the RepInt = 0 setting. The value on the HMI follows the changes in the
input measuring quantity continuously.
3.
Check the set operate levels of the monitoring function by changing
the magnitude of input quantities and observing the operation of the
corresponding output relays.
The output contact changes its state when the changes in the input mea-
suring quantity are higher than the set values HIWARN, HIALARM, or
lower than the set values LOWWARN, LOWALARM.
Completing the test
Continue to test another function or complete the test by setting the test mode to off. Restore
connections and settings to the original values, if they were changed for testing purpose.
Chapter 13
Verifying settings by secondary
section "Preparing for test" in this
injection
131
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