Self-powered measuring apparatus and measurement method
First Claim
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1. A measuring device for determining a current intensity on a line, the measuring device comprising:
- a measuring transformer;
a signal converter; and
a determining unit having a first voltage divider and a second voltage divider configured to generate a first measurement signal and a second measurement signal, respectively, from a primary measurement signal provided by the measuring transformer,wherein the first voltage divider is configured to determine the current intensity on the line within a first value range, and, at a same time, the second voltage divider is configured to determine the current intensity on the line within a second, different value range,wherein the first measurement signal and the second measurement signal are configured to be passed directly, over a measurement line, to the signal converter,wherein the signal converter is configured to identify a more precise measurement signal for a prevailing value range of the current intensity,wherein, for supplying current to the signal converter, the signal converter is switchably connected to the measuring transformer by a supply line.
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Abstract
The present embodiments relate to a measuring apparatus and an associated measurement method. The measuring apparatus is installed on a line and includes a sensing unit having a first and a second voltage divider for producing a first and a second measurement signal with a measurement transducer. The first and second measurement signals are each forwardable via a measurement line directly to a signal transducer. The signal transducer is supplied with power via a supply line by being switchably connected to the measurement transducer.
21 Citations
16 Claims
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1. A measuring device for determining a current intensity on a line, the measuring device comprising:
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a measuring transformer; a signal converter; and a determining unit having a first voltage divider and a second voltage divider configured to generate a first measurement signal and a second measurement signal, respectively, from a primary measurement signal provided by the measuring transformer, wherein the first voltage divider is configured to determine the current intensity on the line within a first value range, and, at a same time, the second voltage divider is configured to determine the current intensity on the line within a second, different value range, wherein the first measurement signal and the second measurement signal are configured to be passed directly, over a measurement line, to the signal converter, wherein the signal converter is configured to identify a more precise measurement signal for a prevailing value range of the current intensity, wherein, for supplying current to the signal converter, the signal converter is switchably connected to the measuring transformer by a supply line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 15, 16)
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8. A method for measuring a current intensity on a line, the method comprising:
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generating a primary measurement signal using a measuring transformer; generating a first measurement signal and a second measurement signal by processing the primary measurement signal by a first voltage divider and a second voltage divider, respectively; determining the current intensity on the line within a first value range using the first voltage divider, and determining, at a same time, the current intensity on the line within a second, different value range using the second voltage divider; and determining and evaluating the first measurement signal, the second measurement signal, or the first and the second measurement signals to generate a measured value using a signal converter, wherein the signal converter is configured to identify a more precise measurement signal for a prevailing value range of the current intensity, wherein power is switchably supplied to the signal converter through the measuring transformer. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method for measuring a current intensity on a line, the method comprising:
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generating a primary measurement signal using a measuring transformer; generating a first measurement signal and a second measurement signal by processing the primary measurement signal by a first voltage divider and a second voltage divider, respectively, and evaluating only the first measurement signal when the current intensity is below a first threshold value, evaluating both the first and the second measurement signals when the current intensity is between the first threshold value and a second threshold value, and evaluating only the second measurement signal when the current intensity is above the second threshold value, and wherein power is switchably supplied to the signal converter through the measuring transformer.
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Specification