Phase-control switching apparatus and switching control...

Details Phase-control switching apparatus and switching control... Phase-control switching apparatus and switching control...

2011-08-30

2011-08-30

Fureman, Jared J (Department: 2836)

Electrical transmission or interconnection systems

Residual or remanent magnetism control

Reexamination Certificate

active

08008810

ABSTRACT:
A residual-magnetic-flux calculating unit includes a voltage-change-rate detecting unit that detects a transformer-voltage change rate from a phase voltage between a breaker and a transformer, a residual-magnetic-flux detecting unit that detects a residual magnetic flux remaining on the transformer based on the phase voltage, and a breaker-switching-state identifying unit that detects a switching state of the breaker. The residual-magnetic-flux calculating unit recalculates the residual magnetic flux based on the transformer-voltage change rate and a predetermined threshold while the breaker is in an open state.

REFERENCES:
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International Search Report (PCT/ISA/210) for PCT/JP2007/058624 completed Jun. 5, 2007.
Written Opinion (PCT/ISA/237) for PCT/JP2007/058624 completed Jun. 5, 2007.

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