Contact Capacitances of 10〜1000 Microfarads in Parallel with Contact Resistances Between Closed Metal Electrodes

概要

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The contact capacitance was investigated by measuring the phase shift between an alternating contact voltage and current of 10 kHz with Cu-Cu and Ni-Ni contacts having a contact resistance of 0.003〜0.3 Ω. The contact current flew 2 to 4 μsec (7 to 14 degrees at 10 kHz) in advance of the voltage as if the contact impedance were capacitance-controlled. The resultant capacitances were estimated at 1000〜10 μF in parallel with the contact resistances. Also measurements using a capacitance-resistance bridge proved the capacitances to be in agreement with the values mentioned above, whereas 10〜100 pF for the contacts without constriction resistance. A possible theory for this capacitance was proposed with a hypothesis including the Pauli principle for the distribution of electron charge in the contact metal.
2011-05-13