Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Magnetic saturation
Patent
1992-03-02
1993-06-22
Nguyen, Vinh
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Magnetic saturation
324126, 324133, 324127, G01R 104
Patent
active
052218945
ABSTRACT:
A weld current switch includes a channel-shaped core, a shunt, and a magnetic reed switch. The magnetic reed switch and shunt are placed across the core poles. An electrical conductor carrying high current passes through the core. Upon deenergization of the electrical current, a residual magnetism remains in the core. The residual magnetism is normally high enough to prevent the magnetic reed switch from opening. However, the shunt directs sufficient magnetic flux from the switch such that the switch senses a much lower level of magnetic flux than if the shunt were not present. As a result, the switch opens, even with the high residual flux in the core. The increased reliability of the switch upon decreasing current at electrical conductor deenergization enables the weld current switch to use a higher sensitivity switch than was formerly possible. The higher sensitivity switch reduces the level of magnetic flux at which the reed switch will close on increasing current upon energization of the electrical conductor.
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Cayen Donald
Miller Electric Manufacturing Company
Nguyen Vinh
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