Electrical transmission or interconnection systems – Plural load circuit systems – Control of current or power
Reexamination Certificate
2005-11-29
2005-11-29
Riley, Shawn (Department: 2838)
Electrical transmission or interconnection systems
Plural load circuit systems
Control of current or power
C307S017000
Reexamination Certificate
active
06969927
ABSTRACT:
A power switching apparatus comprising a current transformer with coupled primary and secondary windings, the primary windings being adapted for series connection between alternate current power source and load, the primary windings comprising first and second sub-primary windings of different number of turns of windings and respectively of a larger and a smaller core diameter, a current conduction path being provided from intermediate the first and the second sub-primary windings to the power switching means so that upon detection of a current exceeding the current rating of the second sub-primary windings, current will be caused to flow from alternate current power source to load via a current loop comprising the power switching means and the first sub-primary windings only.
REFERENCES:
patent: 4751607 (1988-06-01), Smith
patent: 6259610 (2001-07-01), Karl et al.
patent: 2 099 243 (1982-12-01), None
Clipsal Asia Holdings Limited
Riley Shawn
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