Number of fans 5.3.3
As the number of fan groups varies by transformer type, the current number can be en-
tered in the menu. As a result, this setting will be adjusted in all menus in which fan control
and fan service life parameters are configured.
There are a total of six fan cooling groups that are identified in the menu by the numbers 1:
to 6:.
Current measurement 5.3.4
A transformer's hot spot is affected by a number of trans-
former parameters (Hgr, Y, time constant) and by the two
measured quantities oil temperature and current through
the winding. Different sources to measure the current are
available for different applications. The necessary settings
can be made in the 'Current Measurement' setup.
5.3.4.1 CT mounting
The “CT mounting” submenu can be used to specify where the current is measured from. If
“Secondary” is chosen, the current that is connected to the first current measurement in-
put is used for the calculation. If “primary” is selected, the current at the second current
measurement input is selected. “Primary” can only be used if the “three winding” feature is
activated with hardware characteristic M9. Furthermore, the current required to calculate
the hot-spot temperature can be supplied via an analogue mA input. If this option is re-
quired, please contact A. Eberle GmbH & Co. KG.
5.3.4.2 Ratio of the power transformer
In order to determine the primary current when measuring the secondary current, the
power transformer's conversion ratio is used to convert the measured current to primary
current. This parameter is also used to calculate the secondary current for the Monitor's
'Windings' screen when the primary current is measured. This setting is only necessary if
the current measurement is taken from the secondary side of the power transformer.
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