US3789236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for monitoring the electrical energy delivered by an energy source
Assignee: TRAVAUX D ELECTRICITE D ELECTR
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Filing: 1972-08-09
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Granted: 1974-01-29
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Expires: 1992-08-09
Abstract
Abstract An apparatus for monitoring the energy supplied by a source to a load system including sensors which provide signals proportional to current and voltage to a multiplier which produces a signal proportional to instantaneous power. The power signal is compared with a reference and the difference is integrated over a preselected interval of time at the end of which the integrator is reset. The integrated signal is compared with a second reference and the difference is applied to a comparator. If the resulting signal exceeds a set limit an alarm is actuated or selected portions of the load are disconnected from the source. A delay circuit prevents actuation at the beginning of the integration.
Inventors
- 👤 P Lacroix
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:35
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/12; H02J3/14; G; G01; G01R; G01R11/00; G01R11/56; G01R21/00; G01R21/007; H02J2105/00; H02J2105/50; H02J2105/52; Y; Y02; Y02B; Y02B70/00; Y02B70/30; Y02B70/3225; Y04; Y04S; Y04S20/00; Y04S20/20; Y04S20/222
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
93 words
An apparatus for monitoring the electrical energy delivered by a source comprising the combination of means connected to the output of the source for producing a first electrical signal proportional to the instantaneous value of the power being delivered by the source; means for providing a first reference signal; means for algebraically subtracting said first electrical signal and said first reference signal to produce a difference signal; means for integrating said difference signal for a predetermined interval of time; and means for resetting said means for integrating after the end of said interval.
Claim 2
Independent Claim
93 words
An apparatus for monitoring the electrical energy delivered by a source comprising the combination of means connected to the output of the source for producing a first electrical signal proportional to the instantaneous value of the power being delivered by the source; means for providing a first reference signal; means for algebraically subtracting said first electrical signal and said first reference signal to produce a difference signal; means for integrating said difference signal for a predetermined interval of time; and means for resetting said means for integrating after the end of said interval.
Claim 3
Dependent Claim
35 words
An apparatus according to claim 1 and further comprising means responsive to the output of said means for integrating for disconnecting an electrical load from said source when said output meets a predetermined magnitude criterion.
Claim 4
Dependent Claim
34 words
An apparatus according to claim 1 and further comprising an alarm; and means responsive to the output of said means for integrating for activating said alarm when said output meets a predetermined magnitude criterion.
Claim 5
Dependent Claim
71 words
An apparatus according to claim 1 wherein said means connected to the output of the source comprises first means for generating a signal proportional to the instantaneous value of current delivered by said source; second means for generating a signal proportional to the instantaneous value of source output voltage; and multiplier circuit means for accepting said first and second signals and producing said signal proportional to the instantaneous value of current.
Claim 6
Dependent Claim
39 words
An apparatus according to claim 1 wherein said means for integrating includes an operational amplifier and a capacitor connected between the output and input terminals thereof; and timing means for selectively rendering said path conductive to discharge said capacitor.
Claim 7
Dependent Claim
96 words
An apparatus according to claim 1 and further comprising means for determining the value of said integration signal in relation to a given value, before the resetting of said integrator, comprising means for providing a second electrical reference signal; an adder for combining said second reference signal and the output of said means for integrating; and an adjustable delay switch connected to the output of said adder to disconnect the output of said adder after each resetting of said means for integrating for a time shorter than the time elapsed between each resetting of said integrator.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |