http://ontology.tno.nl/smart-rail#Frequency
Class Frequency

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A type of parameter. Important complementary information accompanying the AC voltage is the frequency of the current, expressed in hertz (Hz). The aforementioned AC voltages have the frequency either of 50 Hz (25 000 V AC) or 16,7 Hz (15 000 Hz, formerly 16 2/3 Hz). Both voltage and frequency shall be seen rather as a descriptive parameter in the context of Smart-Rail.
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Frequency
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Parameter

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