US3823327A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for symmetrically distribution load to electrical machines operated in parallel
Assignee: Siemens AG
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Filing: 1972-12-18
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Granted: 1974-07-09
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Expires: 1992-12-18
Abstract
Abstract An arrangement is disclosed for symmetrically distributing load to parallel operated electrical machines such as direct-current to alternating current converters, inverters of an interruptionfree power supply installation or the like. A plurality of current controllers corresponding to respective ones of the machines is provided. Each controller has at least two inputs for respectively receiving an actual value signal indicative of the actual machine current of the corresponding electrical machine and a reference signal indicative of the mean value of the individual actual machine currents. An improvement of the stability is thereby achieved, particularly when individual machines are connected and disconnected during operation. Automatic monitoring and equipment for disconnecting faulty machines without interruption of the current supply to the consumer can also be provided.
Inventors
- 👤 K Bayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:27
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/04; H02J3/06; H02J3/38; H02J3/46
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
127 words
An arrangement for symetrically distributing the load of parallel operated electrical machines such as direct current to alternating current converters, inverters of an interruption-free power supply installation and the like comprising; a. means associated with each electrical machine for developing an output representing the actual current being provided out of the machine; b. means having as inputs all of the outputs representing said machine actual currents for forming an output representative of the mean value of said currents; and c. a plurality of means for controlling the current of said machines each associated with a respective machine and each having as one input said output representing the actual current of said machine and as a second input the output of said means for forming said mean value.
Claim 2
Dependent Claim
127 words
An arrangement for symetrically distributing the load of parallel operated electrical machines such as direct current to alternating current converters, inverters of an interruption-free power supply installation and the like comprising; a. means associated with each electrical machine for developing an output representing the actual current being provided out of the machine; b. means having as inputs all of the outputs representing said machine actual currents for forming an output representative of the mean value of said currents; and c. a plurality of means for controlling the current of said machines each associated with a respective machine and each having as one input said output representing the actual current of said machine and as a second input the output of said means for forming said mean value.
Claim 3
Dependent Claim
45 words
The arrangement of claim 1, said mean value forming means comprising an operational amplifier connected as an impedance transformer, said amplifier having an input circuit including resistors of like value for receiving respective voltages proportional to the respective actual machine currents of the electrical machines.
Claim 4
Dependent Claim
122 words
The arrangement of claim 1 wherein the electrical machines are rotary direct-current to alternating current converters for supplying a voltage and current to an output line and wherein said current controllers each have an additional input, the arrangement comprising a frequency controller common to all of said current controllers for providing the same at the additional inputs thereof with a frequency signal indicative of the difference between a reference frequency and the actual frequency of the voltage supplied to the output line, and a plurality of speed controllers corresponding to respective ones of the direct-current machines of the converters, said current controllers having respective outputs connected to corresponding ones of said speed controllers for supplying the same with respective correction reference values.
Claim 5
Dependent Claim
116 words
The arrangement of claim 3 comprising a plurality of disconnect switches corresponding to respective ones of the converters for connecting the converters to the output line, a plurality of limit monitors corresponding to respective ones of the converters, each of said monitors being responsive to the difference of said reference signal of said mean value forming means and the actual converter current of the corresponding converter for providing an output signal when said difference exceeds a predetermined limit, and logic circuit means for evaluating said output signals of said monitors to detect a possible faulty converter and for then actuating the corresponding one of said disconnect switches to disconnect the faulty converter from the output line.
Claim 6
Dependent Claim
140 words
The arrangement of claim 4 for n converter units operating in parallel to supply voltage and current to the output line, said logic circuit means comprising voltage supply means, and (n/2) times (n-1) relays having respective actuating coils corresponding to respective ones of said disconnect switches, the outputs of said limit monitors being apportioned so that the output of each limit monitor forms together with the output of at least one other limit monitor on output pair so as to form (n/2) times (n-1) output pairs, said actuating coils being connected to respective ones of said pairs, each of said relays having a plurality of pairs of make contacts, each one of said actuating coils being serially connected to said voltage supply means through a series connection consisting of a pair of contacts from each of the other (n-1) relays.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-08 | 1978-01-07 | 1978-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-08 | 1982-01-07 | 1982-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-08 | 1986-01-07 | 1986-07-09 | $7700.00 | Window Closed / Lapsed |