Patent ID: 7714566

Claim:
An electrical power monitoring system that monitors characteristics of power distributed through one or more power conductors, said system comprising multiple clamp-on current and voltage modules each of which includes a current transformer having a core divided into at least two parts so that the core can be installed around a power conductor without cutting the conductor, said transformer producing a current signal corresponding to current passing through said power conductor, a pair of clamping elements adapted to fit between said current transformer core and said power conductor, on opposite sides of said conductor, for gripping said conductor, said transformer core parts and said clamping elements having engaging surfaces that prevent relative movement between said engaging surfaces in a direction parallel to the axis of said power conductor when said transformer core parts are pressed against said clamping elements in a direction transverse to the axis of said power conductor, a voltage sensor for making electrical contact with said power conductor and producing a voltage signal corresponding to the voltage on said power conductor, and an enclosure for said current transformer, and electrical circuitry in said enclosure for receiving said current and voltage signals and converting those signals to digital signals, and a stationary base module connected to said enclosures of said multiple clamp-on current and voltage modules for permanently supporting said enclosures and said current and voltage modules therein independently of said power conductor.