| 摘要 |
<p>An electricity meter for metering the amount of electrical energy supplied by a power supplier to a power consumer is provided with means for detecting the presence of an external shunt (76) which has been connected to by-pass its internal current sensing means (22). The detecting means comprises a step-up auto transformer (70) having its primary winding (72) connected to receive the supply voltage and its secondary winding (74) connected in series with the current sensing means (22) of the meter.</p> |
