Clarence G Duenke

US Patent:

43693539, Jan 18, 1983

Filed:

Jul 2, 1981

Appl. No.:

6/279707

Inventors:

Clarence G. Duenke - San Angelo TX

International Classification:

H05B 102

US Classification:

219492

Abstract:

An apparatus and method of drying a transformer by applying current to a winding thereof in a controlled fashion. Alternating with periods of applying the current to the winding, the electrical resistance of the winding is periodically measured using a bridge circuit. The application of the current is controlled, dependent on the results of the resistance measurements, to discontinue the application of current when the measured resistance is equal to or greater than a preset resistance. The current application is resumed when the measured resistance falls below the preset resistance. In a preferred form insulation resistance is tested by measuring leakage current after each measurement of winding resistance and when leakage resistance reaches an acceptable level the apparatus is shut down.

US Patent:

43204325, Mar 16, 1982

Filed:

Dec 3, 1979

Appl. No.:

6/099615

Inventors:

Clarence G. Duenke - San Angelo TX

Assignee:

San Angelo Electric Service Company - San Angelo TX

International Classification:

H02H 704

US Classification:

361 39

Abstract:

A high voltage transformer bushing having an inner conductor extending from a lower end to a point spaced from an upper end and having a side terminal at that point connected to a fuse link which is in turn connected to a high voltage line connector supported on the upper end of the bushing. A lightning arrester supported by and grounded to the transformer casing has an upper end spaced from the high voltage line connector to provide a spark gap.

US Patent:

44019637, Aug 30, 1983

Filed:

Dec 14, 1981

Appl. No.:

6/330251

Inventors:

Clarence G. Duenke - Marthasville MO

Assignee:

Warco, Inc. - Marthasville MO

International Classification:

H01H 8542

US Classification:

337282

Abstract:

A protective fuse comprising a fusible element disposed within an enclosure formed by a gas generating fiber tube connected at one end to a conductor rod and at the other end to an arc intercepting member. The arc intercepting member is connected to an elongated tubular resistor element which in turn is connected at its opposite end to a cap comprising a conductor connected to the fusible element. Upon parting of the fusible element an arc established by the fault current comes into contact with the arc intercepting member so that a circuit is established through the resistor element thereby momentarily reducing the fault current to a level which can be extinguished by the deionizing gases generated within the interior of the fuse. The conductor rod is formed of a magnetic material which is capable of generating a substantial magnetic flux which functions to bias the arc against the interior wall of the fiber tube to enhance the generation of deionizing gases. The resistor element is soldered to the arc intercepting member and the conductor cap with solders having different melting points whereby the cap may be blown off the resistor to lengthen the distance between conductor elements.

US Patent:

44968051, Jan 29, 1985

Filed:

Sep 9, 1983

Appl. No.:

6/530867

Inventors:

Clarence G. Duenke - San Angelo TX

Assignee:

Warco, Inc. - Marthasville MO

International Classification:

H01H 1958
H01H 2178

US Classification:

200 11TC

Abstract:

A transformer tap changing switch including a rotary contactor shaft supporting spaced apart radially extending arms having roller contactor sets mounted thereon and yieldably biased into engagement with adjacent ones of an array of elongated cylindrical rod contacts supported between spaced apart switch frame plates. Each of the rod contacts includes a centrally disposed lug or blade type terminal located between the roller contactor assemblies and spaced sufficiently from each such that current flow along the rod contact elements between the terminal portions and the rotary switch contactors establish counteracting magnetic force fields which substantially cancel each other and eliminate any forces acting on the rotary contactor assembly. The switch includes a manually actuated lever for rotating the contactor shaft and which is provided with a switch position locking mechanism including a spring biased pin which projects into a selected hole in a position locking plate member.