Electricity meters
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United States of America Patent
Stats
-
Dec 13, 1983
Grant Date -
N/A
app pub date -
Feb 9, 1981
filing date -
Feb 7, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electricity meter for metering the amount of electrical energy supplied by a power supplier to a power consumer is provided with fraud detection means for detecting the presence of an external shunt which has been connected to by-pass its internal current sensing means. The detection means, which comprises a differential current sensor for sensing the difference between the respective currents flowing to and from the consumer via the meter and a multiplier for multiplying this current difference by a signal derived from the supply voltage, is arranged to operate a circuit breaker, and/or to compensate the energy measurement of the meter, and/or to provide a warning to the supplier. The differential current sensor also senses when current is being taken between the live wire and earth on the consumer's side of the meter.
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