| 摘要 |
<p>An electronic watt-hour meter for a four wire three chase system is of simplified construction, giving accurate measurements with a readily obtainable as pulse. For each phase a voltage transformer (PT1,2,3) and current transformer (CT1,2,3) are provided to obtain stepped-down values. Three electronic switches (S1,2,3) for voltage and three for current (S'1,2,3) on the secondary sides are controlled by three phase control pulses to a working circuit (M) which multiplies voltage and current of each phase in turn and generates a current proportional to the sum of the electrical power of the three phases. This current is converted to a pulse train in a converter (A) and fed to an indicating pulse counter (F).</p> |
