Electronic electricity meter
First Claim
1. Electronic electricity meter for measuring the consumption of electric energy comprising a measuring part having a magnetic current sensor, and an evaluating part for processing an output signal from the measuring part and determining an amount of electric energy consumed, characterized in that the magnetic current sensor comprises a transformer (3) which has an air gap and is of the unloaded transformer type and in that the measuring part further comprises an integration state (6, 13) connected downstream of said transformer and in that the evaluating part includes a microcomputer in which a scale dimensioning of the output signal from the measuring part is performed with allowance made for a characteristic time constant of the integration stage (6, 13).
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Accused Products
Abstract
A meter includes a measuring part (1) and an evaluating part (2). The measuring part (1) contains an open magnetic current transformer (3) of the unloaded transformer type and an integrator (6) connected downstream of the transformer. As a result, no measuring errors caused by saturation occur in the transformer, and the metering of consumption is frequency-independent.
42 Citations
12 Claims
- 1. Electronic electricity meter for measuring the consumption of electric energy comprising a measuring part having a magnetic current sensor, and an evaluating part for processing an output signal from the measuring part and determining an amount of electric energy consumed, characterized in that the magnetic current sensor comprises a transformer (3) which has an air gap and is of the unloaded transformer type and in that the measuring part further comprises an integration state (6, 13) connected downstream of said transformer and in that the evaluating part includes a microcomputer in which a scale dimensioning of the output signal from the measuring part is performed with allowance made for a characteristic time constant of the integration stage (6, 13).
Specification