Power line monitoring apparatus and method
AssigneeThe University of Manchester
InventorHaiyu LI
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Abstract
Devices and methods for measuring an electrical characteristic, in particular, for measuring current are provided. The devices can use a pair of MEMS optical modulators as opposed to the more conventional coil and associated oil insulation arrangement.
Claims11
A current transformer responsive to a current carried, at a respective voltage, by a conductor;
- the current transformer comprising a circuit for providing a modulated optical output that varies with current variation of the current via at least one optical modulator;
- the circuit comprising a voltage reference line for coupling to the conductor to bias the circuit using the respective voltage.
A current transformer as claimed in any preceding claim wherein the circuit comprises upper and lower nodes having a voltage divider, a voltage clamp or clipper and a rectifying arrangement spanning the upper and lower nodes.
A method of installing a current transformer;
- the method comprising installing a current transducer about a conductor;
- and coupling an output of the current transducer to the conductor to provide a biasing voltage to a circuit for driving an optical modulator.
A Rogowski coil comprising a winding for magnetically coupling to a transmission line to produce a voltage via at least a pair of outputs associated with the magnetic coupling;
- the coil further comprising an input for electrically connecting the coil to the transmission line to derive a voltage thereform.
-14. (canceled)
Dependencies are inferred from the claim text.