Electricity: electrical systems and devices – Safety and protection of systems and devices – Transient responsive
Patent
1995-06-05
1997-09-09
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Transient responsive
361 43, 361 45, 361113, 361118, 361 58, 363 39, H02H 322
Patent
active
056662556
ABSTRACT:
A transformerless conditioner of a power distribution system consists of an electronically enhanced filter (EEF) for suppression of transient impulses on the power line and neutral line, and a transformerless ground conditioner for suppression of transient impulses on the ground line. The filter includes a normal mode filter having an inductor located on the power line and an inductor located on the neutral line between source and load of the power distribution system, and a pair of capacitors arranged in series and connected between the power and neutral lines, whereby a midpoint tap is formed between the pair of capacitors. The EEF also includes a unique common mode filter which is formed by the series connection of either inductor of the power line or the neutral line, or both, to its corresponding capacitor and then to the midpoint, from which an electronic impulse detector is connected to ground. The impulse detector is set to actuate an electronic switch, also connected to midpoint, and thereby connect a large capacitor from ground to the midpoint during the presence of a transient impulse on either the power line, neutral line or both. Optionally, a transformerless ground conditioner can be included to block or attenuate transient impulses on the ground line.
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Gaffin Jeffrey A.
Powervar, Inc.
Sherry Michael J.
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