Apparatus for monitoring current levels in an a.c. transmission line
AssigneeLucas Industries public limited company
InventorColin T. Osborne
Life of this patent
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Abstract
An apparatus for monitoring current levels at adjacent zones along an a.c. transmission line is provided by current transformers at said zones, the secondaries of the transformers being connected in a series circuit such that currents induced in the secondaries are all in the same direction in said series circuit. Resistors are connected between a common connection of the series circuit and respective interconnections between the transformer secondaries. Devices are provided for monitoring the voltages across the resistors.
Claims8
An apparatus for monitoring difference in current levels between adjacent zones of an a.c. transmission line comprising a plurality of current transformers responsive to current levels at a plurality of locations on said line, the secondary windings of said transformers being connected in a series circuit so that currents induced in said secondary windings are all in the same direction in said series circuit, a plurality of first resistances between a common connector of said series circuit and respective interconnections between said secondary windings of adjacent transformers, and means for detecting the voltages across said first resistances.
Dependencies are inferred from the claim text.