| 摘要 |
An electric power monitoring device that senses power system voltages by capacitive coupling to one or more power system conductors. The capacitive coupling may be embodied by wrapping a conductive material around the insulating covering of a power system conductor. A capacitor is connected between the conductive material and a reference voltage to form a simple voltage divider. The voltage across the capacitor is proportional to the power system voltage and is used as an information signal which is analyzed by a microprocessor, after being converted to digital form by an analog-to-digital converter. Standard current transformers may be used to provide current information signals, which are also analyzed by the microprocessor. Operating power may be derived from one or more of the current information signals generated by current transformers. The power monitor requires no direct connections to power system conductors and requires no separate source of operating power.
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