US3801907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct current measurement
Assignee: Individual
•
Filing: 1972-10-12
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Granted: 1974-04-02
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Expires: 1992-10-12
Abstract
Abstract A direct current measuring device utilizing two pairs of saturable toroidal reactors to generate two output signals which are compared to provide a feed back signal. The feed back signal is applied to the reactors through serially connected feed back windings to balance the output signals. The pairs of reactors have a bias signal applied through serially connected bias windings so that the bias signal applied to one pair is opposite in sense to the bias signal applied to the other pair. The magnitude of the feed back signal is measured to provide a direct indication of the current flow being measured.
Inventors
- 👤 M Lilienstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:49
CPC Classifications
G; G01; G01R; G01R15/00; G01R15/14; G01R15/18; G01R15/183; G01R15/185; G01R33/00; G01R33/02; G01R33/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
322 words
In a device of the type utilizing a plurality of saturable reactors to measure DC current flow in a conductor, the combination of: a first plurality of said reactors for enclosing the conductor; a second plurality of said reactors for enclosing the conductor; a control winding on each of said reactors; a bias winding on each of said reactors; a feed back winding on each of said reactors; means serially connecting said feed back windings and a current flow indicator means; bias circuit means serially interconnecting the bias windings so that the first plurality of bias windings are connected to the second plurality of bias windings in magnetic opposition and including a source of DC potential to energize the bias windings; first output circuit means for generating a rectified first output signal and including a source of AC potential, a rectifier circuit, means serially interconnecting the source of AC potential, the rectifier circuit and the control windings on the first plurality of reactors; a second output circuit means for generating rectified second output signal and including a source of AC potential, a rectifier circuit, means serially interconnecting the source of AC potential, the rectifier circuit and the control windings on the second plurality of reactors; and feed back means including an amplifier having an input and an output, means for applying difference between the first and second output signals to the amplifier as its input, and means connecting the amplifier output in seris with the feed back windings, so that a change in current flow in the conductor produces a difference in magnitude between the first and second output signals applied to the amplifier as its input to change the current flowing in the feed back windings to a magnitude which produces equal first and second output signal magnitudes, whereby the magnitude of the feed back winding current flow is a function of the magnitude of the current flowing in the conductor.
Claim 2
Dependent Claim
322 words
In a device of the type utilizing a plurality of saturable reactors to measure DC current flow in a conductor, the combination of: a first plurality of said reactors for enclosing the conductor; a second plurality of said reactors for enclosing the conductor; a control winding on each of said reactors; a bias winding on each of said reactors; a feed back winding on each of said reactors; means serially connecting said feed back windings and a current flow indicator means; bias circuit means serially interconnecting the bias windings so that the first plurality of bias windings are connected to the second plurality of bias windings in magnetic opposition and including a source of DC potential to energize the bias windings; first output circuit means for generating a rectified first output signal and including a source of AC potential, a rectifier circuit, means serially interconnecting the source of AC potential, the rectifier circuit and the control windings on the first plurality of reactors; a second output circuit means for generating rectified second output signal and including a source of AC potential, a rectifier circuit, means serially interconnecting the source of AC potential, the rectifier circuit and the control windings on the second plurality of reactors; and feed back means including an amplifier having an input and an output, means for applying difference between the first and second output signals to the amplifier as its input, and means connecting the amplifier output in seris with the feed back windings, so that a change in current flow in the conductor produces a difference in magnitude between the first and second output signals applied to the amplifier as its input to change the current flowing in the feed back windings to a magnitude which produces equal first and second output signal magnitudes, whereby the magnitude of the feed back winding current flow is a function of the magnitude of the current flowing in the conductor.
Claim 3
Dependent Claim
16 words
The combination of claim 1 and including an additional reactor having a feed back winding thereon.
Claim 4
Dependent Claim
29 words
The combination of claim 1 and in which the feed back windings on each of said reactors are formed as a single winding would on all of said reactors.
Claim 5
Dependent Claim
61 words
The combination of claim 1 and in which the bias windings on each of said first plurality of reactors are formed as a single winding wound on all of said first plurality of reactors and the bias windings on each of said second plurality of reactors are formed in a single winding wound on all of said second plurality of reactors.
Claim 6
Dependent Claim
29 words
The combination of claim 2 and in which the feed back windings on each of said reactors are formed as a single winding wound on all of said reactors.
Claim 7
Dependent Claim
61 words
The combination of claim 2, and in wHich the bias windings on each of said first plurality of reactors are formed as a single winding wound on all of said first plurality of reactors and the bias windings on each of said second plurality of reactors are formed in a single winding wound on all of said second plurality of reactors.
Claim 8
Dependent Claim
61 words
The combination of claim 3 and in which the bias windings on each of said first plurality of reactors are formed as a single winding wound on all of said first plurality of reactors and the bias windings on each of said second plurality of reactors are formed in a single winding wound on all of said second plurality of reactors.
Claim 9
Dependent Claim
61 words
The combination of claim 5 and in which the bias windings on each of said first plurality of reactors are formed as a single winding wound on all of said first plurality of reactors and the bias windings on each of said second plurality of reactors are formed in a single winding wound on all of said second plurality of reactors.
References Cited (Backward Citations)
US2164383A
Cited
US3015073A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |