US4415968A
Expired / Lapsed
US
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Digital data processing system with asynchronous sensing units
Assignee: Mitsubishi Electric Corp
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Filing: 1981-03-25
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Granted: 1983-11-15
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Expires: 2001-03-25
Abstract
Abstract A digital data processing system in which system parameters in an electric power system such as current or voltage are sampled at predetermined time intervals and converted into digital data by analog-to-digital converter units. The sampling frequency is made higher than the expected frequency of variation of these parameters. Sensing units located remotely from one another sample these parameters at rates which are asynchronous between sensing units. The data transmitted from the various sensing units is sent to a central processing unit where the received signals are sampled synchronously and then processed in order to provide protection for the electric power system.
Inventors
- 👤 Koji Maeda
- 👤 Tadahiro Goda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:04
CPC Classifications
H; H02; H02J; H02J13/00; H02J13/18; H02J13/34; H02J13/36; H02J13/12; Y; Y02; Y02E; Y02E60/00; Y04; Y04S; Y04S10/00; Y04S10/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
184 words
A digital data processing system for protecting an analog system such as an electric power system, comprising : a plurality of sensing units, located remotely from one another, for sensing variable parameters representative of operating conditions of said system, each of said sensing units comprising (1) means for sampling at least one of said parameters at a predetermined time interval and means for converting samples of said at least one parameter into digital data, said converting means comprising analog-to-digital converter means having a sampling frequency higher than expected variations with time of said at least one parameter; and (2) transmitting means for transmitting said digital data, said analog-to-digital converter means of each of said sensing units operating asynchronously from one another; and a data processing unit receiving digital data transmitted from each of said sensing units for producing control outputs for protectively controlling said analog system, said data processing unit comprising a data processing device for synchronously sampling said digital data transmitted from said sensing units and means for processing the sampled digital data in accordance with predetermined programs for producing said control outputs.
Claim 2
Dependent Claim
184 words
A digital data processing system for protecting an analog system such as an electric power system, comprising : a plurality of sensing units, located remotely from one another, for sensing variable parameters representative of operating conditions of said system, each of said sensing units comprising (1) means for sampling at least one of said parameters at a predetermined time interval and means for converting samples of said at least one parameter into digital data, said converting means comprising analog-to-digital converter means having a sampling frequency higher than expected variations with time of said at least one parameter; and (2) transmitting means for transmitting said digital data, said analog-to-digital converter means of each of said sensing units operating asynchronously from one another; and a data processing unit receiving digital data transmitted from each of said sensing units for producing control outputs for protectively controlling said analog system, said data processing unit comprising a data processing device for synchronously sampling said digital data transmitted from said sensing units and means for processing the sampled digital data in accordance with predetermined programs for producing said control outputs.
Claim 3
Dependent Claim
37 words
The digital data processing system of claim 1, wherein each of said analog-to-digital converter means in each of said sensing units comprises a sampling signal generating clock circuit and a frequency division circuit for producing sampling signals.
Claim 4
Dependent Claim
30 words
The digital data processing system of either claim 1 or claim 2, wherein said data processing unit comprises a random access memory for receiving data transmitted by said sensing units.
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) | 1986-11-14 | 1987-05-16 | 1987-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-14 | 1991-05-16 | 1991-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-14 | 1995-05-16 | 1995-11-15 | $7700.00 | Window Closed / Lapsed |