Siemens 6MD85, Manual

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Figure 10-12 Functional Measured Values in DIGSI
Checking the Voltage-Control Function for Parallel Transformers
First you must check the manual update of the transformer taps in the operating mode
Manual
. Proceed as
follows:
•
Switch the Master device to the operating mode
Manual
.
•
Switch the Follower devices to the operating mode
Auto
.
•
On the Master device, start a
Higher adjusting command
for the tap changer.
The voltage controllers in Follower mode of the same group must also change to a higher tap once the new
tap-changer position is reached.
•
Check the tap position of the Follower devices on the device display of the on-site operation panel.
•
Repeat the test with a
Lower adjusting command
.
Checking the Voltage-Control Function of the Master-Follower Method
•
Carry out the test items of the voltage-controller function in the chapter 10.10.1.1 General in the Master
device.
i i
NOTE
During this test, note that the measured control voltage
Vact.m
is averaged from the measured voltages
of all parallel voltage controllers and therefore the secondary voltage must be fed in for all voltage control-
lers.
Checking the Line Compensation
To check the Z Compensation (LDC-Z), proceed as follows:
The parameter
Target voltage rising
represents the voltage drop across the line as a % at rated load.
Since the rated load current in the Master and Follower devices can be different, you must calculate the
parameter
Target voltage rising
separately for each voltage controller.
•
First, based on the following ratio, determine the percentage of the primary load current of the line
compared with the rated current of a transformer k (k = 1, 2, …, 8).
Functional Tests
10.10 Commissioning Hints for Voltage Control
1084 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017