Directional wave detector apparatus
AssigneeASEA Aktiebolag
InventorSalomon Liberman
Life of this patent
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Abstract
In directional wave detector apparatus for electrical power line relay protection devices determining the direction to a fault, the current and voltage of the travelling waves generated by a fault point are combined at a measuring point and the sign of the combined signal is determined. A tripping or blocking signal is emitted depending on whether the sign of the combined signal indicates that the fault lies within or outside the range protection of the relay protection device.
Claims8
Directional wave detector apparatus in electrical power line relay protection devices for determining the direction to a fault from the direction of movement of travelling waves generated by a fault and passing through a measuring point in said electrical power lines, comprising:
- means for multiplying or dividing the current and voltage of at least a portion of the travelling waves to determine the sign of the product or quotient signal;
- means for recording the sign of the first appearing product or quotient;
- and
- means for emitting a tripping or blocking signal dependent on whether the sign of the product or quotient obtained upon multiplication or division indicates that the fault lies within or outside the range of protection of the relay, respectively.
Dependencies are inferred from the claim text.