Wet/dry hot stick tester

Details Wet/dry hot stick tester Wet/dry hot stick tester

1996-08-01

1997-11-04

Karlsen, Ernest F.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324557, 324559, 324133, G01R 3102, G01R 3112

Patent

active

056844050

ABSTRACT:
A wet/dry hot stick tester designed to provide a dry test of a hot stick by applying a voltage equivalent to 100 KV/ft to the hot stick, and to provide a wet test of a hot stick by applying a voltage equivalent to 75 KV/ft thereto. Output electrodes are positioned along a reading aperture provided in a housing of the hot stick tester, in which a hot stick being tested is positioned. A two tap transformer has a first input tap for providing a first voltage equivalent to 100 KV/ft to a hot stick positioned in the reading aperture during a dry test thereof, and has a second input tap for providing a second voltage equivalent to 75 KV/ft to a hot stick during a wet test thereof. An ammeter measures the leakage current through the hot stick during an applied voltage. A wet/dry switch switches the two tap transformer between the first and second input taps. The wet/dry switch comprises a ganged switch with a first set of contacts which switch between the first and second input taps of the transformer, and a second set of contacts which switch a resistor into and out of a transformer! and an input to an operational amplifier which drives the ammeter.

REFERENCES:
patent: 3193765 (1965-07-01), Bevins
patent: 3392334 (1968-07-01), Bevins
patent: 3914687 (1975-10-01), Bevins
patent: 4558273 (1985-12-01), Nishimura
patent: 4998070 (1991-03-01), Rosenberg et al.
patent: 5075620 (1991-12-01), Shaw
patent: 5136234 (1992-08-01), Shaw
patent: 5475313 (1995-12-01), Dykes

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