Electricity: electrical systems and devices – Safety and protection of systems and devices
Patent
1988-07-29
1990-05-22
DeBoer, Todd E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
361 79, 324694, 101228, 4007081, 226 10, G01R 2702, H02H 340
Patent
active
049281984
ABSTRACT:
A high voltage electrode device including a plurality of individual electrodes having end portions projecting beyond an insulating surface and arranged to form at least one group or electrically connected electrodes and apparatus for energizing and deenergizing each group of electrodes. The energizing and deenergizing apparatus includes a high voltage source associated with a respective group and having a control input for turning off the high voltage source wherein the high voltage source provides an output to the group via a current measuring device providing an output indicative of the current measured. A voltage measuring device is connected to the associated group and provides an output indicative of the voltage measured, and quotient forming unit responsive to the outputs of the current measuring device and the voltage measuring device forming a quotient thereof and providing an output when the quotient formed has a predetermined relation to a reference value. The control input is responsive to the output of the quotient forming unit for turning off the high voltage source of the associated group.
REFERENCES:
patent: 2978636 (1957-04-01), Fountain
patent: 4300094 (1981-11-01), Piso
Deboer Todd E.
Eltex-Elektrostatik-Gesellschaft mbH
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