Apparatus and method for providing differential protection...

Details Apparatus and method for providing differential protection... Apparatus and method for providing differential protection...

2005-08-18

2008-01-15

Sherry, Michael (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

C361S076000, C702S058000

Reexamination Certificate

active

07319576

ABSTRACT:
Provided is an apparatus and method for providing differential protection for a phase angle regulating transformer having a load side and a source side in a three-phase power system. The method includes calculating a first positive sequence component and a first negative sequence component associated with incoming secondary currents detected on the source side, calculating a second positive sequence component and a second negative sequence component associated with outgoing secondary currents detected on the load side, applying a phase angle shift to the second positive sequence component and the second negative sequence component to form a compensated positive sequence component and a compensated negative sequence component, respectively, and determining an operate current value and a restraint current value for each of a positive and negative sequence differential element of the differential protection based on the compensated positive sequence component and the compensated negative sequence component.

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patent: WO 2005/064759 (2005-07-01), None
Tziouvaras, Demetrios A., “Protecting a 138 KV Phase Transformer EMTP Modeling and Model power System Testing,” Nov. 2002, Pullman, Washington USA.

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