US3882373A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control device for power line voltage measuring circuit
Assignee: General Electric Co
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Filing: 1974-05-06
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Granted: 1975-05-06
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Expires: 1994-05-06
Abstract
Abstract A high voltage power line is provided with a coupling capacitor for connecting a carrier system to the power line and for also providing a voltage divider to indicate the line voltage. The coupling capacitor usually comprises a series of individual capacitors that provide the necessary voltage rating. A load transformer has a primary winding connected across one of the capacitors of the series and has a secondary winding connected to an output load. A control load and a voltage indicator are coupled to the transformer. The indicated voltage is compared to a power line reference voltage, and the relative difference changes the control load so that a substantially constant load is presented to the transformer. Thus, its output voltage at its secondary winding supplying the output load is a more accurate indication of line conditions. When the power line voltage approaches zero, the reference voltage does also, and the control short-circuits the control load to cause the output voltage at the output load secondary winding to approach zero very quickly.
Inventors
- 👤 Theodore Brenig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:59
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/24; G05F1/26; G05F1/30
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
168 words
In a power line measuring system having a coupling capacitor, an improved control circuit comprising: a. a load transformer having a primary winding and a secondary winding coupled thereto; b. means adapted to couple said primary winding across one of the capacitors of the coupling capacitor; c. means for deriving a reference voltage from the power line; d. means for coupling a load to said secondary winding; e. a controllable load coupled to said transformer, said controllable load having control terminals for receiving control signals to vary the magnitude of said controllable load; f. means coupled to said transformer for deriving a load voltage therefrom; g. means for comparing said reference voltage and said load voltage and producing a control signal having a magnitude that varies as a function of the relative magnitudes of said load voltage and said reference voltage; h. and means coupling said control signal to said control terminals of said controllable load for changing said load as a function of said control signal magnitude.
Claim 2
Dependent Claim
168 words
In a power line measuring system having a coupling capacitor, an improved control circuit comprising: a. a load transformer having a primary winding and a secondary winding coupled thereto; b. means adapted to couple said primary winding across one of the capacitors of the coupling capacitor; c. means for deriving a reference voltage from the power line; d. means for coupling a load to said secondary winding; e. a controllable load coupled to said transformer, said controllable load having control terminals for receiving control signals to vary the magnitude of said controllable load; f. means coupled to said transformer for deriving a load voltage therefrom; g. means for comparing said reference voltage and said load voltage and producing a control signal having a magnitude that varies as a function of the relative magnitudes of said load voltage and said reference voltage; h. and means coupling said control signal to said control terminals of said controllable load for changing said load as a function of said control signal magnitude.
Claim 3
Dependent Claim
22 words
The improved control circuit of claim 1 wherein said controllable load is connected in series with a primary winding of said transformer.
Claim 4
Dependent Claim
22 words
The improved control circuit of claim 1 wherein said controllable load is connected in parallel with a secondary winding of said transformer.
Claim 5
Dependent Claim
214 words
In a power line measuring system having a coupling capacitor, an improved control circuit comprising: a. a load transformer having a primary winding and at least one secondary winding coupled thereto; b. means adapted to couple said primary winding across one of the capacitors of the coupling capacitor; c. means for deriving a reference voltage from the power line; d. means for coupling a load to a secondary winding; e. a controllable load coupled in series with said primary winding, said controllable load having control terminals for receiving control signals to vary the magnitude of said controllable load; f. means coupled to a secondary winding for deriving a transformer load voltage therefrom; g. means for comparing said reference voltage and said transformer load voltage and producing a control signal having a magnitude that varies as a function of the relative magnitudes of said transformer load voltage, and said reference voltage; h. and means coupling said control signal to said control terminals of said controllable load for decreasing the voltage applied to said primary winding in response to an increase of said transformer load voltage relative to said reference voltage and for increasing the voltage applied to said primary winding in response to a decrease of said transformer load voltage relative to said reference voltage.
Claim 6
Dependent Claim
214 words
In a power line measuring system having a coupling capacitor, an improved control circuit comprising: a. a load transformer having a primary winding and at least one secondary winding coupled thereto; b. means adapted to couple said primary winding across one of the capacitors of the coupling capacitor; c. means for deriving a reference voltage from the power line; d. means for coupling a load to a secondary winding; e. a controllable load coupled in series with said primary winding, said controllable load having control terminals for receiving control signals to vary the magnitude of said controllable load; f. means coupled to a secondary winding for deriving a transformer load voltage therefrom; g. means for comparing said reference voltage and said transformer load voltage and producing a control signal having a magnitude that varies as a function of the relative magnitudes of said transformer load voltage, and said reference voltage; h. and means coupling said control signal to said control terminals of said controllable load for decreasing the voltage applied to said primary winding in response to an increase of said transformer load voltage relative to said reference voltage and for increasing the voltage applied to said primary winding in response to a decrease of said transformer load voltage relative to said reference voltage.
Claim 7
Dependent Claim
210 words
In a power line measuring system having a coupling capacitor, an improved control circuit comprising: a. a load transformer having a primary winding and at least one secondary winding coupled thereto; b. means adapted to couple said primary winding across one of the capacitors of the coupling capacitor; c. means for deriving a reference voltage from the power line; d. means for coupling a load to a secondary winding; e. a controllable load coupled in parallel with a secondary winding, said controllable load having control terminals for receiving control signals to vary the magnitude of said controllable load; f. means coupled to a secondary winding for deriving a transformer load voltage therefrom; g. means for comparing said reference voltage and said transformer load voltage and producing a control signal having a magnitude that varies as a function of the relative magnitudes of said transformer load voltage and said reference voltage; h. and means coupling said control signal to said control terminals of said controllable load for decreasing said transformer load voltage in response to a prior increase of said transformer load voltage relative to said reference voltage and for increasing said transformer load voltage in response to a prior decrease of said transformer load voltage relative to said reference voltage.
Claim 8
Dependent Claim
210 words
In a power line measuring system having a coupling capacitor, an improved control circuit comprising: a. a load transformer having a primary winding and at least one secondary winding coupled thereto; b. means adapted to couple said primary winding across one of the capacitors of the coupling capacitor; c. means for deriving a reference voltage from the power line; d. means for coupling a load to a secondary winding; e. a controllable load coupled in parallel with a secondary winding, said controllable load having control terminals for receiving control signals to vary the magnitude of said controllable load; f. means coupled to a secondary winding for deriving a transformer load voltage therefrom; g. means for comparing said reference voltage and said transformer load voltage and producing a control signal having a magnitude that varies as a function of the relative magnitudes of said transformer load voltage and said reference voltage; h. and means coupling said control signal to said control terminals of said controllable load for decreasing said transformer load voltage in response to a prior increase of said transformer load voltage relative to said reference voltage and for increasing said transformer load voltage in response to a prior decrease of said transformer load voltage relative to said reference voltage.
Claim 9
Dependent Claim
26 words
The improved control circuit of claim 5 wherein said load coupling means, said controllable load, and said deriving means are coupled to a common secondary winding.
Claim 10
Dependent Claim
28 words
The improved control circuit of claim 5 wherein said load coupling means, said controllable load, and said deriving means are each coupled to a separate, respective secondary winding.
References Cited (Backward Citations)
US2756414A
Cited
US3458764A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |