| 摘要 |
<p>An energy reporting unit can comprise a split toroid transformer 2, a microprocessor and a wireless data transmission means 5. The energy reporting unit can further comprise of a passive infra red sensor (Pir, figure 3). The reporting unit can be configured such that it is normally switched off, switching on only when a voltage change is detected, or alternatively switched on intermittently for a predetermined amount of time which is shorter than the period of time it is switched off. Also disclosed is a method for monitoring power usage utilizing the energy reporting unit which involves using the energy reporting unit during a fault free operating cycle, storing the energy usage signature thereof, monitoring subsequent operating cycles, and comparing the stored signature of the fault free operating cycle with the signature of each subsequent operating cycle. Exemplary uses include household or office power meters, electrical distribution boards, power outlets or light switches.</p> |
