Method and device for fault detection in an N-winding...

Details Method and device for fault detection in an N-winding... Method and device for fault detection in an N-winding...

2011-01-18

2011-01-18

Raymond, Edward (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system

Performance or efficiency evaluation

Reexamination Certificate

active

07873496

ABSTRACT:
A method and a device for fault detection in an n-winding, three-phase power transformer. For each of the windings (Wi) the three phase currents (IL1—Wi; IL2—Wi; IL3—Wi) are measured. For each of the windings (Wi) deciding if a zero sequence current (I0—Wi) reduction is to be performed depending on at least one user setting (kWi) and if so, deducting the zero sequence current (I0—Wi) from each of the three phase currents (IL1—Wi; IL2—Wi; IL3—Wi). For each of the windings (Wi) generating normalized currents by performing a magnitude compensation and a phase angle shift compensation on the results of the previous step. For each of the three phases (Lx) comparing the normalized current of a single winding with the normalized currents of all other windings. For each phase (Lx) generating a fault signal, if a difference between the single winding (W1) and all other windings (W2, . . . , Wn) exceeds a predefined level.

REFERENCES:
patent: 4156186 (1979-05-01), Wolfinger
patent: 6507184 (2003-01-01), Elston
patent: 2006/0276979 (2006-12-01), Price
patent: 2162269 (2001-01-01), None
patent: WO 2005/064759 (2005-07-01), None
patent: WO 2005/078885 (2005-08-01), None
patent: WO 2005/078886 (2005-08-01), None
Zoran Gajic; Universal Differential Protection for Power Transformers; IEEE; Apr. 20, 2006; pp. 1-6.
PCT/ISA/201—International Type Search Report, Dec. 9, 2005.
PCT/ISA/210—International Search Report, Dec. 9, 2005.
PCT/ISA/237—Written Opionion of the International Searching Authority, Dec. 9, 2005.

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