Transformer inrush current elimination system

Details Transformer inrush current elimination system Transformer inrush current elimination system

2006-08-22

2006-08-22

Feild, Lynn (Department: 2835)

Electrical transmission or interconnection systems

Switching systems

Condition responsive

C307S129000, C323S209000

Reexamination Certificate

active

07095139

ABSTRACT:
A closing phase that produces the smallest energization flux error at a connection input point is calculated based upon a residual flux of the first closing phase and the preliminarily given pre-arc characteristic and closing time deviation characteristic of a three-phase circuit breaker, so that the calculated phase value is set as a target closing phase of the first closing phase. A closing phase that produces the smallest energization flux error when a residual flux of zero is calculated, so that the calculated phase value is set as a target closing phase of the remaining two phases. The total time required from the reference point to the target closing phases of the remaining two phases and a delay time corresponding to an integer multiple of a given cycle of the three-phase power supply is set as a target closing time of the remaining two phases.

REFERENCES:
patent: 2551022 (1951-05-01), Lerstrup
patent: 6392390 (2002-05-01), Ito et al.
patent: 2-179220 (1990-07-01), None
patent: 11-345546 (1999-12-01), None
John H. Brunke, “Elimination of Transformer Inrush Currents by Controlled Switching-Part II: Application and Performance Considerations”, IEEE Transactions on Power Delivery, Apr. 2001, vol., 16, No. 2, pp. 281-285.
J. Brunke, “Elimination of Transformer Inrush Currents by Controlled Switching-Part I: Theoretical Considerations,”IEEE Transactions on Power Delivery, Apr. 2001, vol. 16(2).

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