Patent US3591847A successfully refreshed from Google Patents.
US3591847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Parallel operation of ac generators
Assignee: Cummins Inc
•
Filing: 1968-09-27
•
Granted: 1971-07-06
•
Expires: 1988-09-27
Abstract
Abstract Means for connecting an AC generator driven by a prime mover to an AC power transmission line and operating the generator or generators on the power line. Each generator is connected to the power line by first bringing the generator up to approximately synchronous speed, with the generator field deenergized, and then connecting the generator winding to the power line. The power line voltage pulls the generator into synchronism, and the generator field is then energized. Means is also provided automatically to prevent connection of the generator to the power line until a certain generator speed is reached, and automatically to disconnect the generator from the power line in the event the prime mover is shut down.
Inventors
- 👤 Richard M Donnell
- 👤 John D Hamilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:40
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/38; H02J3/40; H02J3/42; H02P; H02P9/00; H02P9/02
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
167 words
A control system for an AC generator connected to be driven by a prime mover, said generator comprising power windings, field windings, and exciter means for controlling energization of said field windings, said system comprising circuit breaker means for connecting said power windings to AC power transmission lines, first switch means responsive to at least one opErating characteristic of said prime mover and adapted to be actuated in response to malfunction in respect to said one operating characteristic of said prime mover, means acting in response to closure of said circuit breaker means for operating said exciter means at full level of energization, and enabling means cooperating with said circuit breaker means and responsive to said first switch means for enabling closure of said circuit breaker means in the absence of a malfunction in respect to said one operating condition and for opening said circuit breaker means if previously closed in the event of a malfunction in respect to said one operating characteristic of said prime mover.
Claim 2
Dependent Claim
167 words
A control system for an AC generator connected to be driven by a prime mover, said generator comprising power windings, field windings, and exciter means for controlling energization of said field windings, said system comprising circuit breaker means for connecting said power windings to AC power transmission lines, first switch means responsive to at least one opErating characteristic of said prime mover and adapted to be actuated in response to malfunction in respect to said one operating characteristic of said prime mover, means acting in response to closure of said circuit breaker means for operating said exciter means at full level of energization, and enabling means cooperating with said circuit breaker means and responsive to said first switch means for enabling closure of said circuit breaker means in the absence of a malfunction in respect to said one operating condition and for opening said circuit breaker means if previously closed in the event of a malfunction in respect to said one operating characteristic of said prime mover.
Claim 3
Dependent Claim
40 words
Apparatus as in claim 1, and further including means responsive to actuation of said first switch means for shutting down said prime mover in the event of a malfunction in respect to said one operation characteristic of said prime mover.
Claim 4
Dependent Claim
81 words
Apparatus as in claim 1, and further including second switch means responsive to the speed of said prime mover and adapted to be actuated at above a predetermined speed, said enabling means being further responsive to said second switch and enabling closure of said circuit breaker means at speeds of said prime mover above said predetermined speed, and for opening said circuit breaker means if previously closed in the event the speed of said prime mover falls below said predetermined speed.
Claim 5
Dependent Claim
34 words
Apparatus as in claim 1, and further including battery means connected through said first switch means to said exciter means and to said enabling means for energizing said exciter means and said enabling means.
Claim 6
Dependent Claim
56 words
Apparatus as in claim 1, and further including second switch means responsive to the speed of said prime mover and adapted to be actuated at above a predetermined speed, and motor means responsive to said second switch for automatically effecting closure of said circuit breaker contacts at speeds of said prime mover above said predetermined speed.
Claim 7
Dependent Claim
26 words
Apparatus as in claim 5, and further including a battery connected to energize said motor means at speeds of said prime mover above said predetermined speeds.
Claim 8
Dependent Claim
24 words
Apparatus as in claim 5, wherein said motor means is adapted to be connected to receive power from said power windings of said generator.
Claim 9
Dependent Claim
116 words
Apparatus as in claim 5 and further including a second control system for a second generator connected to be driven by a second prime mover, said second generator and said second prime mover being substantially the same as said first generator and said first prime mover, said second system comprising circuit breaker contacts for connecting the power windings of said second generator to said power transmission lines, third switch means responsive to the speed of said second prime mover for energizing the field windings of said second generator when the speed of said second prime mover is above a predetermined level, and means connecting the power windings of said second generator to power said motor means.
Claim 10
Dependent Claim
45 words
Apparatus as in claim 8, wherein said second control system further includes motor means for actuating said circuit breaker contacts of said second system, said connecting means further connecting the power windings of said second generator to power said motor means of said second system.
Claim 11
Dependent Claim
65 words
Apparatus as in claim 9, and further including time delay means for connecting said motor means of said first system to be powered by the power windings of said first generator in the event said motor means of said first system does not receive power from the power windings of said first generator within a predetermined time after said first switch means has been actuated.
Claim 12
Independent Claim
137 words
A system for paralleling an alternating current generator on an energized power line and for controlling operation of said generator after connection with the power line, said generator being driven by a prime mover and comprising power windings, field windings, and exciter means for energizing said field windIngs, said system comprising circuit breaker means connected between said power windings and said power lines, means acting in response to the speed of said prime mover for enabling closure of said circuit breaker means and for enabling operation of said exciter means at full level of energization, and means responsive to at least one operating characteristic of said prime mover and connected to open said circuit breaker contacts in the event previously closed and to shut down said prime mover in the event of malfunctioning of said prime mover.
Claim 13
Independent Claim
137 words
A system for paralleling an alternating current generator on an energized power line and for controlling operation of said generator after connection with the power line, said generator being driven by a prime mover and comprising power windings, field windings, and exciter means for energizing said field windIngs, said system comprising circuit breaker means connected between said power windings and said power lines, means acting in response to the speed of said prime mover for enabling closure of said circuit breaker means and for enabling operation of said exciter means at full level of energization, and means responsive to at least one operating characteristic of said prime mover and connected to open said circuit breaker contacts in the event previously closed and to shut down said prime mover in the event of malfunctioning of said prime mover.
Claim 14
Dependent Claim
69 words
Apparatus as in claim 11, wherein said speed responsive means comprises a switch which is closed only at speeds of the prime mover above a predetermined speed, and a coil in said circuit breaker which is energized when said speed responsive switch is closed, energization of said coil in said circuit breaker enabling closure of said circuit breaker contacts, and deenergization of said coil effecting opening of said contacts.
Claim 15
Dependent Claim
122 words
Apparatus as in claim 11, wherein said speed responsive means comprises a switch which is closed only at speeds of said prime mover above a predetermined speed and a coil in said circuit breaker means and said means responsive to at least one operating characteristic of said prime mover comprises a separate switch in series with said speed responsive switch, said operating characteristic responsive means being normally closed when said prime mover is operating normally, whereby said coil is energized when said prime mover is operating normally at above said predetermined speed, energization of said coil enabling closure of the circuit breaker means, and deenergization of said coil effecting opening of said circuit breaker means in the event it was previously closed.
Claim 16
Dependent Claim
50 words
Apparatus as in claim 11, and further including motor means for automatically closing and opening said circuit breaker means, said motor means being connected to close said circuit breaker means when said speed responsive means is actuated in response to operation of said prime mover at above said predetermined speed.
Claim 17
Independent Claim
135 words
A system for controlling the operation of an AC generator connected to be driven by a prime mover, said generator comprising power windings, field windings, and exciter means for controlling energization of said field windings, said system comprising circuit breaker means adapted to be connected to the output of said power windings, motor means for opening and closing said circuit breaker means, conductor means adapted to form a circuit between said motor means and said power windings, and means responsive to the speed of said prime mover for actuating said exciter means to energize said field windings when the speed of said prime mover is above a predetermined value, whereby energization of said field windings induces a voltage in said power windings, and said voltage energizes said motor means to close said circuit breaker means.
Claim 18
Independent Claim
135 words
A system for controlling the operation of an AC generator connected to be driven by a prime mover, said generator comprising power windings, field windings, and exciter means for controlling energization of said field windings, said system comprising circuit breaker means adapted to be connected to the output of said power windings, motor means for opening and closing said circuit breaker means, conductor means adapted to form a circuit between said motor means and said power windings, and means responsive to the speed of said prime mover for actuating said exciter means to energize said field windings when the speed of said prime mover is above a predetermined value, whereby energization of said field windings induces a voltage in said power windings, and said voltage energizes said motor means to close said circuit breaker means.
Claim 19
Dependent Claim
56 words
Apparatus as in claim 15, and further including switch means connected in said conductor means for controlling current flow to said motor means, said switch means being arranged to be actuated by said speed responsive means to close said circuit to said motor means when the speed of said prime mover is above said predetermined value.
Claim 20
Independent Claim
175 words
A system for controlling the operation of first and second AC generators connected to be driven by first and second prime movers, respectively, each of said generators comprising power windings, field windings, and exciter means for controlling energization of said field windings, said system comprising first circuit breaker means connected to the output of the power windings of said first generator, second circuit breaker means connected to the output of the power windings of said second generator, first and second motor means, for opening and closing said first and second circuit breaker means, respectively, means for actuating said exciter means of said first generator to energize said field windings of said first generator wheN the speed of said first prime mover is above a predetermined level, and conductor means connecting said power windings of said first generator to energize said first and second motor means, whereby said motor means close said circuit breakers when said first prime mover is operating above said predetermined speed and hence said field windings of said first generator are energized.
Claim 21
Independent Claim
175 words
A system for controlling the operation of first and second AC generators connected to be driven by first and second prime movers, respectively, each of said generators comprising power windings, field windings, and exciter means for controlling energization of said field windings, said system comprising first circuit breaker means connected to the output of the power windings of said first generator, second circuit breaker means connected to the output of the power windings of said second generator, first and second motor means, for opening and closing said first and second circuit breaker means, respectively, means for actuating said exciter means of said first generator to energize said field windings of said first generator wheN the speed of said first prime mover is above a predetermined level, and conductor means connecting said power windings of said first generator to energize said first and second motor means, whereby said motor means close said circuit breakers when said first prime mover is operating above said predetermined speed and hence said field windings of said first generator are energized.
Claim 22
Dependent Claim
97 words
Apparatus as in claim 17, and further including means responsive to the speed of said second generator, normally open second switch means for actuating said exciter means of said second generator to energize said field windings of said second generator and for connecting when closed said power windings of said second generator to energize said second motor means, and timer means, said speed responsive means of said second generator and said timer means closing said second switch means in the event said first prime mover does not reach said predetermined speed level within a predetermined time period.
Claim 23
Dependent Claim
42 words
Apparatus as in claim 18, and further including third switch means responsive to voltage generated by said power windings of said second generator for connecting said first motor means for energization by voltage generated by said power windings of said second generator.
Claim 24
Dependent Claim
188 words
A control system for an AC generator connected to be driven by a prime mover, said generator comprising power windings, field windings, and exciter means for energizing said field windings, said system comprising circuit breaker means for connecting said power windings to AC power transmission lines, first means adapted to be connected to said prime mover and respond to a malfunction in said prime mover, second means acting in response to closure of said circuit breaker means for operating said exciter means at full level of energization, and enabling means cooperating with said circuit breaker means and responsive to said first means for enabling closure of said circuit breaker means in the absence of a malfunction, such closure of said circuit breaker means resulting in actuation of said exciter means by said second means to operate said exciter means, said enabling means also responding to said first means to open said circuit breaker means if previously closed in the event of a malfunction of said prime mover, such opening of said circuit breaker means resulting in actuation of said exciter means to cease operation of said exciter means.
Claim 25
Dependent Claim
188 words
A control system for an AC generator connected to be driven by a prime mover, said generator comprising power windings, field windings, and exciter means for energizing said field windings, said system comprising circuit breaker means for connecting said power windings to AC power transmission lines, first means adapted to be connected to said prime mover and respond to a malfunction in said prime mover, second means acting in response to closure of said circuit breaker means for operating said exciter means at full level of energization, and enabling means cooperating with said circuit breaker means and responsive to said first means for enabling closure of said circuit breaker means in the absence of a malfunction, such closure of said circuit breaker means resulting in actuation of said exciter means by said second means to operate said exciter means, said enabling means also responding to said first means to open said circuit breaker means if previously closed in the event of a malfunction of said prime mover, such opening of said circuit breaker means resulting in actuation of said exciter means to cease operation of said exciter means.
Claim 26
Dependent Claim
82 words
A control system for an AC generator as in claim 20, and further including third means adapted to be connected to said prime mover and respond to the speed of said prime mover, said enabling means further being responsive to said third means and enabling closure of said circuit breaker means when said prime mover is operating at above a predetermined speed and opening said circuit breaker means in the event the speed of said prime mover falls below said predetermined speed.
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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |