Patent US3573549A successfully refreshed from Google Patents.
US3573549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical system including capacitors
Assignee: R H BOULIGNY Inc
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Filing: 1969-05-09
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Granted: 1971-04-06
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Expires: 1989-05-09
Abstract
Abstract An alternating current electrical circuit having a bank of capacitors connected therein and in which the voltage appearing on the circuit is varied by varying interconnection of capacitors and the possible appearance of resonance effects is controlled by interconnection of a resistor with the capacitors.
Inventors
- 👤 Herman B Wolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:38
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/12; H02J3/16; H02H; H02H9/00; H02H9/005; H02H9/007; Y; Y02; Y02E; Y02E40/00; Y02E40/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
112 words
In an alternating current electrical circuit having a bank of capacitors connected therein and being subject to the occurrence of resonance therein, the combination of resonance suppressing means comprising: a. resistor directly connected in parallel to said bank of capacitors to normally impress a resistance thereacross for suppressing resonance in said circuit; b. normally closed contactor means connected in series with said resistor; and c. means operatively connected to said contactor means and responsive to a predetermined current flow in said bank of capacitors for actuating said contactor means to open the same to remove said resistor from said circuit after there is no further likelihood of resonance occurring in said circuit.
Claim 2
Dependent Claim
112 words
In an alternating current electrical circuit having a bank of capacitors connected therein and being subject to the occurrence of resonance therein, the combination of resonance suppressing means comprising: a. resistor directly connected in parallel to said bank of capacitors to normally impress a resistance thereacross for suppressing resonance in said circuit; b. normally closed contactor means connected in series with said resistor; and c. means operatively connected to said contactor means and responsive to a predetermined current flow in said bank of capacitors for actuating said contactor means to open the same to remove said resistor from said circuit after there is no further likelihood of resonance occurring in said circuit.
Claim 3
Dependent Claim
67 words
A circuit according to claim 1 wherein said circuit includes an iron core reactance whereby there is substantial danger of ferroresonance occurring in said circuit immediately following energization thereof, and wherein said means for actuating said contactor means (c) operates very quickly upon the current in said circuit reaching said predetermined value to quickly remove said resistor from said circuit when the danger of ferroresonance has passed.
Claim 4
Dependent Claim
86 words
A circuit according to claim 1 wherein said circuit includes a relatively large motor connected thereto which is subject to being started during periods when said circuit is otherwise lightly loaded so that there is substantial danger of subsynchronous resonance occurring in said circuit, and wherein said means (c) delays actuation of said contactor means and removal of said resistor for a time period sufficient for said motor to reach normal running condition and thereafter until tHe load current in the circuit exceeds said predetermined value.
References Cited (Backward Citations)
US2571910A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |