Measuring apparatus for determining the effective value of the power demand of an energy consumer over a period of calculation
AssigneeLGZ Landis & Gyr Zug AG
InventorAlfred Spalti
Life of this patent
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Abstract
In a measuring apparatus for determining the effective value of the power demand of an energy consumer over a period of calculation, a pulse generator 4 associated with a consumption meter 3 produces fixed quantity pulses. A measuring and calculating means 6 forms measurement values which are proportional to the reciprocal of the time intervals between the fixed quantity pulses and which are summed in a summing means 7. An evaluation means 9, which is in communication with the summing means 7 by way of a communication channel 8, forms the effective value P.sub.eff from the sum of the measurement values. The measuring and calculating means 6 may comprise a microprocessor.
Claims4
A measuring apparatus for determining the effective value of the power of an energy consumer over a period of calculation, the apparatus comprising;
- a pulse generator associated with a consumption meter, for producing fixed quantity pulses each of which represents the consumption of a predetermined fixed quantity of energy;
- a measuring and calculating means connected to the pulse generator, for forming measurement values which are proportional to the reciprocal of the time intervals between the individual fixed quantity pulses;
- a summing means for summing the measurement values;
- and an evaluation means for forming the effective value P.sub.eff of the power in accordance with the relationship:
- ##EQU11## wherein E.sub.o denotes the fixed quantity of energy, T denotes the duration of the period of calculation, and Z denotes the sum of the measurement values.
Dependencies are inferred from the claim text.