Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-03-30
1977-10-04
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 61R, 324 725, 324126, G01R 3112, G01R 3102, G01R 1916
Patent
active
040526658
ABSTRACT:
A capacitive pickup device for deriving a measurable voltage which is a linear function of the magnitude of pulsating high voltage of the order of 15 to 40 kilovolts in an insulated conductor, the pickup device having a pair of electrically conducting plate members connected together electrically to form one plate element of a capacitor, the conductor itself forming the other plate element of the capacitor and the conductor insulation forming the dielectric. The pickup device also includes a pair of electrically conducting plates respectively carried in spaced relation with the plate members, the plates being centrally relieved to accommodate the plate members and adapted to be connected to ground. An indicating and protective gaseous conduction lamp is electrically connected between the plate members and plates, and a capacitor and a resistor are connected in parallel across the lamp to form an output circuit for connection to apparatus for indicating in linear manner the magnitude of the high voltage in the conductor. The plate members and plates are relatively movable so they selectively may open and close for receiving a portion of the insulated conductor without requiring conductor disconnection.
REFERENCES:
patent: 2445808 (1948-07-01), Stenstrom
patent: 2750562 (1956-06-01), Starr
patent: 2804592 (1957-08-01), Biskeborn
patent: 2808566 (1957-10-01), Douma
patent: 3477024 (1969-11-01), Pelta
patent: 3524133 (1970-08-01), Arndt
patent: 3798541 (1974-03-01), Campbell et al.
patent: 3970932 (1976-07-01), Harvey
Snap-on Tools Corporation
Strecker Gerard R.
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