Contact fault detector

Details Contact fault detector Contact fault detector

1978-04-19

1979-11-06

Tokar, M.

Electricity: measuring and testing

Electromechanical switching device

Relay

324420, G01R 3102

Patent

active

041737350

ABSTRACT:
A technique and a circuit is described for readily detecting contact resistance build-up and contact chatter. Closed contacts are arranged in series with each other and with a resistor. A voltage is applied across the series arrangement. Each contact is shorted by jumper lead and/or separately jolted. If the contact is defective, the voltage step or series of voltage pulses will appear at the junction between the resistor and the contacts in series. The voltage step or pulses are coupled through a capacitor to a normally on switch which changes state to indicate the presence of the pulse indicating the defective contact. A resistor coupled to the capacitor provides a differentiating circuit to bleed off any charge in the capacitor to permit sequentially testing each contact. A further resistor in combination with the capacitor provides an integrating circuit to assure appropriate capacitor charging in response to the negative going pulses that occur when there is contact chatter.

REFERENCES:
patent: 4104578 (1978-08-01), Thuot

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