US3725774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring electrical energy consumption
Assignee: McGraw Edison Co
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Filing: 1971-02-24
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Granted: 1973-04-03
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Expires: 1991-02-24
Abstract
Abstract A current transformer is connected to an electrical power circuit to provide a measure of the current in the power circuit. The current measure is applied through a reversing switch and a diode rectifying bridge to a coulombmeter and is controlled by commutating the bridge with a voltage from a voltage transformer connected to the electrical power circuit. The connections are made to apply current to the coulombmeter during the portion of the current cycle that occurs during a selected voltage halfcycle. The current measure is further controlled by a modulating circuit connected to respond to the voltage of the power circuit and to modulate the current as a function of voltage level. A control means responds to a selected condition of the coulombmeter to reverse the control current connections to the coulombmeter. A reading means senses the number of reversal operations to thereby provide an indication of the total amount of energy consumed in the power circuit over a selected period.
Inventors
- 👤 V Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:06
CPC Classifications
G; G01; G01R; G01R21/00; G01R21/02
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
111 words
An alternating electrical power measuring system for measuring the electrical energy consumed by an electrical load comprising: a current means responsive to the load current for producing a control current varying as a function of said load current; a recording means connected to receive the control current for measuring net electrical current received and for producing an indication when said net current received reaches a preselected level; and a phase angle means responsive to the load voltage for controlling the control current from the current means to the recording means to apply said control current to said recording means substantially only during preselected portions of each phase of said load voltage.
Claim 2
Dependent Claim
111 words
An alternating electrical power measuring system for measuring the electrical energy consumed by an electrical load comprising: a current means responsive to the load current for producing a control current varying as a function of said load current; a recording means connected to receive the control current for measuring net electrical current received and for producing an indication when said net current received reaches a preselected level; and a phase angle means responsive to the load voltage for controlling the control current from the current means to the recording means to apply said control current to said recording means substantially only during preselected portions of each phase of said load voltage.
Claim 3
Dependent Claim
42 words
An alternating electrical power measuring system according to claim 1 also comprising a voltage means responsive to the load voltage for controlling the control current to vary said control current applied to the recording means as a function of said load voltage.
Claim 4
Dependent Claim
42 words
An alternating electrical power measuRing system according to claim 1 wherein said phase angle means comprises means for controlling the control current to apply said control current to the recording means only during half cycles of one polarity of the load voltage.
Claim 5
Dependent Claim
34 words
An alternating electrical power measuring system according to claim 1 wherein said current means is a current means responsive to the load current for producing a control current substantially proportional to said load current.
Claim 6
Dependent Claim
41 words
An alternating electrical power measuring system according to claim 4 also comprising a voltage means responsive to the load voltage for controlling the control current to vary said control current applied to the recording means substantially proportionally to said load voltage.
Claim 7
Dependent Claim
60 words
An alternating electrical power measuring system according to claim 4 wherein said recording means comprises a measuring means connected to receive the control current for measuring net electrical current received and for producing the indications, and a reading means responsive to said indications to indicate the total electrical current received by said measuring means over a selected period of time.
Claim 8
Dependent Claim
24 words
An alternating electrical power measuring system according to claim 6 wherein said measuring means comprises a coulombmeter having a two polarity predetermined storage capacity.
Claim 9
Dependent Claim
67 words
An alternating electrical power measuring system according to claim 7 wherein said recording means also comprises a reversing means for reversing the direction of said control current applied to the coulombmeter, and a sensing means responsive to the storage level of said coulombmeter to effect operation of the reversing means when said coulombmeter reaches a storage level substantially equal to the predetermined storage capacity of said coulombmeter.
Claim 10
Dependent Claim
62 words
An alternating electrical power measuring system according to claim 8 wherein said recording means comprises a measuring means for measuring electrical current connected to receive the control current to produce an indication of current received, and a reading means responsive to the indication of the measuring means for indicating the electrical current measured by said measuring means over a period of time.
Claim 11
Dependent Claim
34 words
An alternating electrical power measuring system according to claim 6 wherein said measuring means comprises a plating cell having a predetermined storage capacity and an increased internal resistance upon substantially reaching said storage capacity.
Claim 12
Dependent Claim
60 words
An alternating electrical power measuring system according to claim 10 wherein said recording means also comprises a reversing means for reversing the polarity of said control current applied to the plating cell, and a sensing means responsive to the voltage across said plating cell to effect operation of the reversing means when said plating cell voltage reaches a preselected level.
Claim 13
Dependent Claim
98 words
An alternating electrical power measuring system according to claim 4 wherein said recording means comprises an electrical energy measuring device having a predetermined storage capacity, an activating means for reversing the direction of control current applied to said measuring device, a sensing means responsive to the level of storage of said measuring device for operating said activating means when said level reaches said storage capacity of said storage device, and a reading means responsive to operation of said activating means for producing an indication of the total number of said reversing operations over a selected period of time.
Claim 14
Dependent Claim
45 words
An alternating electrical power measuring system according to claim 4 wherein said phase angle means comprises means for controlling the flow of the control current to apply said control current to the recording means only during half cycles of one polarity of the load voltage.
Claim 15
Dependent Claim
36 words
An alternating electrical power measuring system according to claim 4 wherein said current means comprises a current transformer having an output winding coupled to the electrical load to produce the controL current at its output winding.
Claim 16
Dependent Claim
61 words
An alternating electrical power measuring system according to claim 4 also comprising a means responsive to the load voltage for producing a level control voltage, and a means responsive to said level control voltage for modulating the control current to apply said control current to the recording means at a level varying as a direct function of said level control voltage.
Claim 17
Dependent Claim
77 words
An alternating electrical power measuring system according to claim 15 wherein said phase angle means comprises a means responsive to the load voltage for producing a control voltage having a preselected phase relationship to said load voltage, and a means for controlling the flow of said control current from the current means to the recording means to apply said control current to said recording means substantially only during preselected portions of each phase of said control voltage.
Claim 18
Dependent Claim
47 words
An alternating electrical power measuring system according to claim 16 also comprising a voltage means responsive to the load voltage for modulating the control current to vary the control current applied to the recording means at a rate varying as a direct function of said load voltage.
Claim 19
Dependent Claim
193 words
An alternating electrical power measuring system for measuring the electrical energy consumed by an electrical load comprising: a current means responsive to the load current for producing a control current substantially proportional to said load current and having a predetermined phase relationship to said load current; a means connected to receive the control current for measuring electrical current received; a transforming means responsive to the load voltage for producing a control voltage substantially proportional to said load voltage and having a predetermined phase relationship to said load voltage; a voltage means responsive to the control voltage for modulating the control current to apply the control current to the measuring means at a rate substantially proportional to said control voltage; a phase modulating means responsive to the control voltage for controlling the flow of said control current from the current means to the measuring means to apply said control current to said measuring means substantially only during selected half cycles of a selected polarity of said control voltage; and a reading means responsive to the level of electrical current measured by the measuring means for indicating the electrical current measured by said measuring means.
Claim 20
Dependent Claim
193 words
An alternating electrical power measuring system for measuring the electrical energy consumed by an electrical load comprising: a current means responsive to the load current for producing a control current substantially proportional to said load current and having a predetermined phase relationship to said load current; a means connected to receive the control current for measuring electrical current received; a transforming means responsive to the load voltage for producing a control voltage substantially proportional to said load voltage and having a predetermined phase relationship to said load voltage; a voltage means responsive to the control voltage for modulating the control current to apply the control current to the measuring means at a rate substantially proportional to said control voltage; a phase modulating means responsive to the control voltage for controlling the flow of said control current from the current means to the measuring means to apply said control current to said measuring means substantially only during selected half cycles of a selected polarity of said control voltage; and a reading means responsive to the level of electrical current measured by the measuring means for indicating the electrical current measured by said measuring means.
Claim 21
Dependent Claim
37 words
An alternating electrical power measuring system according to claim 18 wherein said current means comprises a current transformer having an output winding coupled to the electrical power circuit to produce the control current at said output winding.
Claim 22
Dependent Claim
36 words
An alternating electrical power measuring system according to claim 19 wherein said phase modulating means comprises a rectifying bridge connected to shunt the control current and to receive the control voltage as a shunt control input.
Claim 23
Dependent Claim
37 words
An alternating electrical power measuring system according to claim 20 wherein said voltage means comprises a controllable resistance circuit connected to shunt control current at a level varying as an indirect function of the control voltage level.
Claim 24
Independent Claim
82 words
A method of determining the electrical energy consumed in an electrical power circuit comprising: sensing the current in the power circuit and producing a control current proportional to said power circuit current; applying the control current to an electrical current measuring device capable of measuring electrical current; sensing the phase of the voltage in the power circuit; and modulating the control current by passing control current to the measuring device only during selected portions of each cycle of the power circuit voltage.
Claim 25
Independent Claim
82 words
A method of determining the electrical energy consumed in an electrical power circuit comprising: sensing the current in the power circuit and producing a control current proportional to said power circuit current; applying the control current to an electrical current measuring device capable of measuring electrical current; sensing the phase of the voltage in the power circuit; and modulating the control current by passing control current to the measuring device only during selected portions of each cycle of the power circuit voltage.
Claim 26
Dependent Claim
36 words
A method according to claim 21 also comprising sensing the power circuit voltage level and further modulating the control current to pass control current to the measuring device At a rate proportional to the voltage level.
Claim 27
Dependent Claim
30 words
A method according to claim 21 also comprising reversing the polarity of the control current applied to the measuring device whenever the measuring device has reached a preselected measuring capacity.
Claim 28
Dependent Claim
125 words
An alternating electrical power measuring system for measuring the electrical energy consumed by an electrical load comprising: a current means responsive to the load current for producing a control current varying as a function of said load current; a recording means connected to receive the control current for measuring electrical current; a phase angle means responsive to the load voltage for controlling the control current from the current means to the recording means to apply said control current to said recording means substantially only during preselected portions of each phase of said load voltage; and a voltage means responsive to the load voltage for controlling the control current to vary said control current applied to the recording means as a function of said load voltage.
Claim 29
Dependent Claim
125 words
An alternating electrical power measuring system for measuring the electrical energy consumed by an electrical load comprising: a current means responsive to the load current for producing a control current varying as a function of said load current; a recording means connected to receive the control current for measuring electrical current; a phase angle means responsive to the load voltage for controlling the control current from the current means to the recording means to apply said control current to said recording means substantially only during preselected portions of each phase of said load voltage; and a voltage means responsive to the load voltage for controlling the control current to vary said control current applied to the recording means as a function of said load voltage.
Claim 30
Dependent Claim
78 words
An alternating electrical power measuring system according to claim 25 wherein said phase angle means comprises a means responsive to the load voltage for producing a control voltage having a preselected phase relationship to said load voltage, and a means for controlling the flow of said control current from the current measuring means to the recording means to apply said control current to said recording means substantially only during preselected portions of each cycle of said control voltage.
Claim 31
Dependent Claim
69 words
An alternating electrical power measuring system according to claim 25 wherein said current means is a current means responsive to the load current for producing a control current substantially proportional to said load current; and wherein said voltage means is a voltage means responsive to the load voltage for controlling the control current to vary said control current applied to the recording means substantially proportionally to said load voltage.
Claim 32
Dependent Claim
53 words
An alternating electrical power measuring system according to claim 27 wherein said voltage means comprises a first means connected to the load voltage for producing a level control voltage, and a second means responsive to said level control voltage level for modulating the control current as a function of said level control voltage.
Claim 33
Dependent Claim
56 words
An alternating electrical power measuring system according to claim 27 wherein said voltage means comprises a first means responsive to the load voltage for producing a level control voltage, and a second means responsive to said level control voltage for controlling the control current to produce a control current substantially proportional to said level control voltage.
Claim 34
Dependent Claim
43 words
An alternating electrical power measuring system according to claim 29 wherein said second means comprises a controllable shunting circuit connected to vary the control current by selectively shunting a portion of said control current as an indirect function of the level control voltage.
Claim 35
Dependent Claim
132 words
An alternating electrical power measuring system according to claim 27 wherein said recording means comprises a measuring device having a predetermined maximum storage capacity indicating a predetermined level of electrical current received, a reversing means for reversing the polarity of control current applied to said measuring device, a sensing means responsive to an indication of the measuring device that said maximum storage capacity has been reached, an activating means responsive to the sensing means for operating the reversing means when said sensing means indicates that said measuring device has reached said maximum storage capacity, and a reading means responsive to operation of said activating means for counting the number of said reversing operations to thereby indicate the total net electrical current received by the measuring device over any selected period of time.
Claim 36
Dependent Claim
53 words
An alternating electrical power measuring system according to claim 31 wherein said voltage means comprises a first means connected to the load voltage for producing a level control voltage, and a second means responsive to said level control voltage level for modulating the control current as a function of said level control voltage.
Claim 37
Dependent Claim
33 words
An alternating electrical power measuring system according to claim 32 wherein said second means comprises a controllable shunting circuit connected to shunt the control current as a function of the level control voltage.
Claim 38
Dependent Claim
79 words
An alternating electrical power measuring system according to claim 32 wherein said phase angle means comprises a first means responsive to the load voltage for producing a control voltage having a preselected phase relationship to said load voltage, and a second means for controlling the flow of said control current from the current means to the recording means to apply said control current to said recording means substantially only during preselected portions of each phase of said control voltage.
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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |