MR ETOS IM - Dissolved Gas Analysis (DGA) (Optional)

7 Operation
Maschinenfabrik Reinhausen GmbH 2019 2015163667/06 EN ETOS
®
IM
The following diagrams show an example of a graph of the fan speeds
based on the load factor according to the set parameters.
10
20
30
40
50
100
%
0 20 40 60 120 140%
n
60
70
80
80 100
0
n
n
min
max
L L
S1 S2
I
L
/
n
I Load factor
Figure149: Fan speed based on load factor
n Fan speed θ
Topoil
Temperature of top-oil
n
min
Minimum fan speed n
max
Maximum fan speed
L
S1
Lower load factor threshold L
S2
Upper load factor threshold
To set the frequency-based cooling system control, proceed as follows:
1. Go to Settings > Parameters > Frequency-controlled cooling system
control.
2. Select the desired parameter.
3. Enter the desired value.
4. Press the Accept button to save the modified parameter.
7.14 Dissolved gas analysis (optional)
You can use the optional function "Dissolved gas analysis" (DGA) to monitor
the gas content and the moisture in the transformer oil. Depending on the
device configuration, the device records the measured values from the sen-
sors either as analog signals (4...20 mA) or MR sensor bus. For the configu-
ration of the sensors, refer to sections "Configuring analog inputs and out-
puts" [►Section 7.17, Page 230] and "MR sensor bus" [►Section 7.16,
Page 219].