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Patent US3679974A successfully refreshed from Google Patents.
US3679974A
Expired / Lapsed
US
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Device for measuring currents in a high voltage conductor including a controlled optical arrangement
Assignee: Siemens AG
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Filing: 1970-07-24
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Granted: 1972-07-25
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Expires: 1990-07-24
Abstract
Abstract A control unit derives a control magnitude from a current to be measured in a high voltage conductor. A controlled optical arrangement utilizes the control magnitude for converting a light beam into light pulses having an information content corresponding to the current to be measured. A light beam is directed into the controlled optical arrangement. A receiver converts the light pulses to output signals corresponding to the current to be measured. The controlled optical arrangement comprises an electro-optical or a magneto-optical device including a double refractor or a polarization plane rotator for transverse double refracting and rotating of the plane of polarization of the light beam. A polarizer polarizes the light beam after rotation of the plane of polarization thereof.
Inventors
- 👤 Klaus Mollenbeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:55
CPC Classifications
G; G01; G01R; G01R15/00; G01R15/14; G01R15/24
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
252 words
A device for measuring currents in a high voltage conductor and for transferring measured values from a high voltage side of the device to a low voltage side of the device in the form of light pulses, said device comprising control means for deriving a control magnitude from a current to be measured in the high voltage conductor, said control means comprising an analog to digital converter having a first analog to digital converter for producing pulses having amplitudes of information content corresponding to the current to be measured and a second analog to digital conVerter for producing pulses having an information content corresponding to the time positions of specific amplitude values, input means for supply in the current to be measured to the analog to digital converter and amplifier means for transferring the control magnitude derived by the analog to digital converter to controlled optical means; controlled optical means at the high voltage side of the device utilizing said control magnitude for converting a light beam into light pulses having an information content corresponding to the current to be measured, said controlled optical means including a plurality of double refracting means each coupled to a corresponding one of said first and second analog to digital converters for producing two series of light pulses; light means for directing a light beam into said controlled optical means; and receiver means at the low voltage side of the device for converting said light pulses to output signals corresponding to the current to be measured.
Claim 2
Independent Claim
252 words
A device for measuring currents in a high voltage conductor and for transferring measured values from a high voltage side of the device to a low voltage side of the device in the form of light pulses, said device comprising control means for deriving a control magnitude from a current to be measured in the high voltage conductor, said control means comprising an analog to digital converter having a first analog to digital converter for producing pulses having amplitudes of information content corresponding to the current to be measured and a second analog to digital conVerter for producing pulses having an information content corresponding to the time positions of specific amplitude values, input means for supply in the current to be measured to the analog to digital converter and amplifier means for transferring the control magnitude derived by the analog to digital converter to controlled optical means; controlled optical means at the high voltage side of the device utilizing said control magnitude for converting a light beam into light pulses having an information content corresponding to the current to be measured, said controlled optical means including a plurality of double refracting means each coupled to a corresponding one of said first and second analog to digital converters for producing two series of light pulses; light means for directing a light beam into said controlled optical means; and receiver means at the low voltage side of the device for converting said light pulses to output signals corresponding to the current to be measured.
Claim 3
Dependent Claim
28 words
A device as claimed in claim 1, wherein said controlled optical means comprises electro-optical means including double refracting means for transverse electrical double refracting of said light beam.
Claim 4
Dependent Claim
28 words
A device as claimed in claim 1, wherein said controlled optical means comprises magneto-optical means including double refracting means for transverse magnetic double refracting of said light beam.
Claim 5
Dependent Claim
47 words
A device as claimed in claim 1, wherein said controlled optical means comprises electro-optical means including polarization plane rotating means for electrically rotating the plane of polarization of said light beam and polarizer means for polarizing the light beam after rotation of the plane of polarization thereof.
Claim 6
Dependent Claim
47 words
A device as claimed in claim 1, wherein said controlled optical means comprises magneto-optical means including polarization plane rotating means for magnetically rotating the plane of polarization of said light beam and polarizer means for polarizing the light beam after rotation of the plane of polarization thereof.
Claim 7
Dependent Claim
23 words
A device as claimed in claim 1, wherein said light means comprises a light source at the low voltage side of the device.
Claim 8
Dependent Claim
40 words
A device as claimed in claim 1, wherein said light means comprises a light source at the low voltage side of the device and reflector means for directing the light beam from said light source to said controlled optical means.
Claim 9
Dependent Claim
42 words
A device as claimed in claim 1, wherein said light means comprises a light source at the low voltage side of the device and light conducting fiber bundles for directing the light beam from said light source to said controlled optical means.
Claim 10
Dependent Claim
27 words
A device as claimed in claim 1, wherein said receiver means comprises photoresponsive means and a digital to analog converter connected in series with said photoresponsive means.
Claim 11
Dependent Claim
42 words
A device as claimed in claim 1, wherein said controlled optical means includes a plurality of polarization plane rotating means each coupled to a corresponding one of said first and second analog to digital converters for producinG two series of light pulses.
Claim 12
Dependent Claim
124 words
A device as claimed in claim 1, further comprising input means for supplying the current to be measured to the analog to digital converter of said control means and wherein the analog to digital converter of said control means further comprises a peak value measuring device connected between said input means and said first analog to digital converter whereby the current to be measured is supplied to said peak value measuring device and said first analog to digital converter produces pulses having an information content corresponding to the peak values of the current to be measured and said second analog to digital converter produces pulses having an information content corresponding to the time positions of the peak values of the current to be measured.
Claim 13
Dependent Claim
77 words
A device as claimed in claim 11, wherein the peak value measuring device of the analog to digital converter of said control means comPrises a pair of parallel circuit branches having rectifiers connected in antiparallel and a capacitor connected in series with said parallel circuit branches, the currents in both circuit branches being utilized for measuring the current to be measured in order to suppress the adverse influence of a rectifier when a dislocated short-circuit is measured.
Claim 14
Dependent Claim
49 words
A device as claimed in claim 12, wherein the analog to digital converter of said control means further comprises measuring voltage means for providing a measuring voltage proportional to the current to be measured, and differentiating means coupling said measuring voltage means to said second analog to digital converter.
Claim 15
Dependent Claim
71 words
A device as claimed in claim 13, wherein the analog to digital converter of said control means further comprises phase angle measuring means connected between both said measuring voltage means and said differentiating means and said second analog to digital converter whereby said phase angle measuring means produces an output voltage having a magnitude proportional to the phase angle between the measuring voltage and the output voltage of said differentiating means.
Claim 16
Dependent Claim
24 words
A device as claimed in claim 14, wherein each of said first and second analog to digital converters comprises a voltage to frequency converter.
References Cited (Backward Citations)
US3419802A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |