Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Patent
1989-03-28
1990-08-28
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
G01R 3102, G01R 3112
Patent
active
049528807
ABSTRACT:
Apparatus for testing and counting flaws in the insulation of an electrical conductor includes an oscillator for generating an alternating test voltage which is used with an electrode to apply a hight test voltage to the insulation of a conductor passing through an electrode wherein the test voltage arcs to the current carrying conductor through an imperfection or flow in the insulation. A fault detection circuit uses a negative threshold voltage upon which the peaks of the alternating test voltage ride and includes a peak rectifying circuit which rectifies the positive excursions of a ringing signal inpressed on the peaks of the test voltage to produce a fault present voltage signal. The oscillator is part of a control loop which includes a full wave precision AC-to-DC converter which provides an output signal to an amplitude controller circuit which adjusts and maintains the magnitude of the alternating test voltage produced by the oscillator at a desired preset value.
REFERENCES:
patent: 3418570 (1968-12-01), Clinton
patent: 3510763 (1970-05-01), Clinton
patent: 3986107 (1976-10-01), Dickson et al.
patent: 4140964 (1979-02-01), Eubank et al.
Eisenzopf Reinhard J.
Regan Maura K.
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