27
UMG 104
Summation current measurement
If the current is measured via two current
transformers, the total transformation ratio of
the current transformers must be programmed
in the UMG104.
Fig. 27.1 Example, current measurement via
summation current transformers.
Example
The current is measured via two current
transformers. Both current transformers
have a transformation ratio of 1000/5A. The
summation measurement is performed with a
5+5/5A summation current transformer.
The UMG104 must then be set as follows:
Primary current: 1000A + 1000A = 2000A
Secondary current: 5A
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