Method and an apparatus for supervising the operation of...

Details Method and an apparatus for supervising the operation of... Method and an apparatus for supervising the operation of...

2007-10-09

2007-10-09

Benson, Walter (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

C324S547000, C361S076000

Reexamination Certificate

active

11359213

ABSTRACT:
A method of supervising the operation of a plurality of current transformers arranged in respective groups and connected to a protection relay forming part of a three-phase electrical power system includes determining a current ratio at an output of each group of current transformers, comparing each current ratio with a predetermined high ratio, comparing each current ratio with a predetermined low ratio, and generating a fault indication when the current ratio at one location exceeds the predetermined high ratio and the current ratio at the or each other location remains below the predetermined low ratio.

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