36 BA 2076/02/01
1) Rated CT current:1) Rated CT current:
1) Rated CT current:1) Rated CT current:
1) Rated CT current: The rated CT current is the output current of the secondary current transformer at the rated load of the
transformer. This can vary for the individual cooling stages. Setting range: 0.5 A to 5 A.
2) Gradient (gr):2) Gradient (gr):
2) Gradient (gr):2) Gradient (gr):
2) Gradient (gr): The gradient is the temperature jump between the average oil temperature and the average winding
temperature at the rated load of the transformer.
3) Winding exponent (y):3) Winding exponent (y):
3) Winding exponent (y):3) Winding exponent (y):
3) Winding exponent (y): Exponential power of current versus winding temperature rise. The exponent can be set in the range of
1.0 to 2.0.
4) Time constant 4) Time constant
4) Time constant 4) Time constant
4) Time constant
tt
tt
t
::
::
: This is the thermal time constant of the oil. When a time constant of 8.0 minutes is set for example, this
means that after 8.0 minutes, 63.2% of the final value of the winding temperature will have been reached. The time constant
can be set from 0.0 to 30.0 minutes.
5) Easy Set:5) Easy Set:
5) Easy Set:5) Easy Set:
5) Easy Set: Press this button to access a submenu with which you can set the preset parameter records in accordance with
IEC 60354. This will make parameterization easier when, for example, the exact parameters of the transformer are no longer
known. The function is explained in more detail below.
6) Hotspot factor (H):6) Hotspot factor (H):
6) Hotspot factor (H):6) Hotspot factor (H):
6) Hotspot factor (H): The hotspot factor describes the difference between the hotspot temperature and the average winding
temperature of the top winding layer. Setting range: 1.0 to 2.0.
7) CT-Ratio:7) CT-Ratio:
7) CT-Ratio:7) CT-Ratio:
7) CT-Ratio: The CT-Ratio is the ratio of the rated current of the transformer to the rated CT current of the secondary current
transformer. Setting range: 1:1 to 3000:1
8) CT-current:8) CT-current:
8) CT-current:8) CT-current:
8) CT-current: The actual CT current is indicated in this field.
9) Load factor:9) Load factor:
9) Load factor:9) Load factor:
9) Load factor: The actual load factor is indicated in this field.
8.18.1
8.18.1
8.1
11
11
1
Easy Set-FunctionEasy Set-Function
Easy Set-FunctionEasy Set-Function
Easy Set-Function
The Easy Set function makes parameterization easier. The Cooling Wizard can be used to parameterize your cooling system with
parameters preset in accordance with IEC 60354.
8 Visualization Software
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