Siemens 6MD85 Manual page 1090

Functional Tests
10.10 Commissioning Hints for Voltage Control
•
With all voltage controllers, approach a
everywhere, and repeat the following tests.
– If the difference of the circulating reactive current control deviation ∣ΔV
smaller than the set bandwidth, increase the parameter Reactive I control factor.
– If the difference of the circulating reactive current control deviation∣ΔV
than double the bandwidth, reduce the parameter Reactive I control factor.
•
Repeat this test for all voltage controllers.
•
With all voltage controllers, approach a
everywhere, and repeat the following tests.
– If the difference of the circulating reactive current control deviation∣ΔV
smaller than the set bandwidth, increase the parameter Reactive I control factor.
– If the difference of the circulating reactive current control deviation∣ΔV
than double the bandwidth, reduce the parameter Reactive I control factor.
•
Repeat this test for all voltage controllers.
Since the transformer reactance can change slightly with the tap position, the points with
minimum tap position mentioned in the preceding section are used to check the stable control.
Checking the Tap Direction and the Set Bandwidth in Parallel Operation with the Master-Follower Method
The following prerequisites apply for the following test:
•
All transformers are switched on.
•
All transformers feed to the same busbar.
•
All voltage controllers are in parallel mode.
•
The Master device is in the Manual operating mode.
•
The Follower devices are in the Auto operating mode.
NOTE
i
i
Carry out these tests only at low load current.
The test sequence corresponds to the sequence under
Page 1089.
•
In addition, test the manually updated tap position of the Follower devices.
If the current is measured on the involved voltage controllers, the line compensation or the circulating reactive
current blocking is activated, you must check the currents.
NOTE
i
i
If a circulating reactive current forms despite the same tap position, there is an error in the tap-position
assignment.
1090
minimum tap position where the same no-load voltages result
maximum tap position where the same no-load voltages result
Checking the Tap Direction and the Set Bandwidth,
SIPROTEC 5, High-Voltage Bay Controller, Manual
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maximum and
C53000-G5040-C015-9, Edition 11.2017