Data Mapping
25
Power Meter, IEC 60870-5-103, Manual
E50417-B1076-C375-A4, Release 11.2012
Figure 3-1 Basic settings - Connection/Transformer Frequency
The SICAM P 7KG7750/55 automatically recognizes the line frequency (either 50 Hz
or 60 Hz) and can measure it with an accuracy of 10 mHz in the measurement range
of 45 Hz to 65 Hz.
Via IEC 60870-5-103 the deviation of the line frequency is transmitted.
A deviation of 5 Hz corresponds to 100 %.
Examples for 50 Hz nominal frequency:
• Line frequency = 50 Hz → IEC 60870-5-103 value = 0 %
• Line frequency = 54 Hz → IEC 60870-5-103 value = 80 %
• Line frequency = 49 Hz → IEC 60870-5-103 value = -20 %
Examples for 60 Hz nominal frequency:
• Line frequency = 60 Hz → IEC 60870-5-103 value = 0 %
• Line frequency = 64 Hz → IEC 60870-5-103 value = 80 %
• Line frequency = 59 Hz → IEC 60870-5-103 value = -20 %
Note:
If Van is less than 30 % of its nominal value then the frequency is indicated as invalid
in the IEC 60870-5-103 telegram.
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