Electricity: electrical systems and devices – Safety and protection of systems and devices – High voltage dissipation
Patent
1979-03-19
1980-12-02
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
High voltage dissipation
H02H 906
Patent
active
042375169
ABSTRACT:
A varistor element is press-fitted into a recess formed in one surface of a metal electrode and protrudes a preselected distance out from the electrode surface. A second metal electrode is positioned in line with but spaced from the varistor by a TEFLON washer of selected thickness to fix the length of the air gap between the varistor and second electrode. The length of the copositioned air gap between the metal electrodes is similarly fixed by the washer and the protruding portion of the varistor. The assembly is held by a central rivet with a spring cup washer positioned under its peened end to hold elements in contact while absorbing some of the discharge force. The rivet is insulated by a nylon tube integral with an open-end cover for the assembly held at the closed end by the rivet head. When a high voltage surge is applied across the arrester assembly, the varistor-to-metal gap ionizes quickly to initiate discharge. Ionization products of the initial discharge, plus the varistor resistance, trigger a shift of the surge discharge to the metal-to-metal gap to protect the varistor from damage by large energy surges.
REFERENCES:
patent: 2309183 (1943-01-01), Gilson et al.
patent: 2415945 (1947-02-01), Gilson
patent: 2907910 (1959-10-01), Marsteller
patent: 2923849 (1960-02-01), Rees
patent: 3204322 (1965-09-01), Rees
American Standard Inc.
McIntire, Jr. R. W.
Moose Jr. Harry E.
Williamson, Jr. A. G.
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