Patent US3855434A successfully refreshed from Google Patents.
US3855434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shorting device for generator output lines
Assignee: Siemens AG
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Filing: 1973-06-12
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Granted: 1974-12-17
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Expires: 1993-06-12
Abstract
Abstract A shorting device for generator output lines in which a hollow, cylindrical movable contact arm, is used to provide short circuit current carrying capability and has inserted inside it a vacuum switching tube having an extending contact which is used as a lead contact for the main contact arm in order to carry any voltages and currents present due to the residual voltage of the generator thereby avoiding the need for stopping of the generator or using reverse excitation prior to closing the contact arm.
Inventors
- 👤 G Grunert
- 👤 E Hartmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:45
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/60; H01H33/66; H01H33/666; H01H33/6661; H01H33/002
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
222 words
A shorting device for shorting an output bus bar of 1 generator to a shorting bar comprising: a. a contact arm electrically connected to the shorting bar; b. a mating contact electrically connected to the output bus bar; c. means to permit said contact arm to move in and out of engagement with said mating contact; d. a vacuum switching tube having a set of contacts in an evacuated chamber one of which is connected to said contact arm and another connected to an extending contact, said switching tube mounted for motion along with said contact arm; e. an advance contact elEctrically coupled to said mating contact and arranged to mate with said extending contact, the arrangement being such that upon moving said contact arm from an open to a closed position, said extending contact will engage said advance contact before said contact arm engages said mating contact; and f. means to operate said set of contacts in said evacuated chamber such that said contacts are open over the portion of movement during engaging and disengaging corresponding to that just prior to engagement and just before disengagement of said extending contact with said advance contact and closed during the portion of remaining movement where said extending contact is engaging said advance contact but said contact arm is not engaging said mating contact.
Claim 2
Dependent Claim
222 words
A shorting device for shorting an output bus bar of 1 generator to a shorting bar comprising: a. a contact arm electrically connected to the shorting bar; b. a mating contact electrically connected to the output bus bar; c. means to permit said contact arm to move in and out of engagement with said mating contact; d. a vacuum switching tube having a set of contacts in an evacuated chamber one of which is connected to said contact arm and another connected to an extending contact, said switching tube mounted for motion along with said contact arm; e. an advance contact elEctrically coupled to said mating contact and arranged to mate with said extending contact, the arrangement being such that upon moving said contact arm from an open to a closed position, said extending contact will engage said advance contact before said contact arm engages said mating contact; and f. means to operate said set of contacts in said evacuated chamber such that said contacts are open over the portion of movement during engaging and disengaging corresponding to that just prior to engagement and just before disengagement of said extending contact with said advance contact and closed during the portion of remaining movement where said extending contact is engaging said advance contact but said contact arm is not engaging said mating contact.
Claim 3
Dependent Claim
82 words
A shorting device according to claim 1, wherein said vacuum switching tube contacts in said chamber are opened and closed by an actuating coil and said operating means comprise: a. a projection on said contact arm; b. at least one limit switch arranged to be operated by said projection; and c. means responsive to actuation of said switch to operate the actuating coil, whereby as said arm moves to and from said mating contact said contacts within said chamber will be operated.
Claim 4
Dependent Claim
133 words
The invention according to claim 2 wherein said vacuum switching tube is arranged so that said contacts in said chamber are normally closed when no voltage is applied to said actuating coil and wherein, first and second limit switches are provided, said first limit switch placed to engage said projection and to de-energize said actuation coils at the point where said extending contact is just engaging said advance contact and said second limit switch is arranged to engage said projection and de-energize said actuating coils when said contact arm is in a fully open position whereby said actuating coils will be energized and said contacts within said chamber open over the portion of motion between said contact arm being fully open and the point where said extending contact first engages said advance contact.
Claim 5
Dependent Claim
16 words
The invention according to claim 3, wherein said advance contact is attached inside said mating contact.
References Cited (Backward Citations)
US3399286A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |