| 摘要 |
An isolation interface for isolating an electricity meter powered by a Class 2 power supply and monitoring a Class 1 power circuit from the power supply circuit being monitored, and an electrical metering system utilizing the interface. The interface comprises an enclosure containing at least one isolation interface circuit comprising an input for electrical connection to a sensor inductively coupled to the Class 1 power circuit, and an output for electrical connection to the electricity meter. A potential transformer having a primary electrically connected to the input and a secondary electrically connected to the output transforms a voltage received from the sensor to an output voltage for the electricity meter. The output is thus electrically isolated from the input, allowing the electricity meter to be manufactured as a low voltage appliance, with attendant reduction in manufacturing costs, and protecting the electricity meter against a fault voltage transmitted by the sensor to the interface. |
