US4464696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secondary arc extinction device
Assignee: Toshiba Corp
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Filing: 1982-05-19
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Granted: 1984-08-07
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Expires: 2002-05-19
Abstract
Abstract A secondary arc extinction device in an electric power system including a bus bar; an electric power line connected to the bus bar; protective relaying means connected to the bus bar; a transformer having a primary winding and a secondary winding, one terminal of the primary winding being connected to the electric power line; first reactance means connected between the other terminal of the primary winding of the transformer and ground; second reactance means connected to the secondary winding of the transformer; and means for controlling the reactance of the second reactance means in response to the protective relaying means.
Inventors
- 👤 Michio Masui
- 👤 Yasuhiro Ogawa
- 👤 Kunio Esumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:56
CPC Classifications
H; H02; H02H; H02H9/00; H02H9/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
113 words
A secondary arc extinction device in an electric power system comprising: a bus bar; an electric power line connected to said bus bar; protective relaying means connected to said bus bar; a transformer having a primary winding and a secondary winding, one terminal of said primary winding being connected to said electric power line; first reactance means connected between the other terminal of said primary winding of said transformer and ground; second reactance means connected to said secondary winding of said transformer; and means for controlling the reactance of said second reactance means in response to said protective relaying means to produce resonance to extinguish a secondary arc when the secondary arc occurs.
Claim 2
Dependent Claim
113 words
A secondary arc extinction device in an electric power system comprising: a bus bar; an electric power line connected to said bus bar; protective relaying means connected to said bus bar; a transformer having a primary winding and a secondary winding, one terminal of said primary winding being connected to said electric power line; first reactance means connected between the other terminal of said primary winding of said transformer and ground; second reactance means connected to said secondary winding of said transformer; and means for controlling the reactance of said second reactance means in response to said protective relaying means to produce resonance to extinguish a secondary arc when the secondary arc occurs.
Claim 3
Dependent Claim
27 words
A secondary arc extinction device as recited in claim 1, wherein said second reactance means comprises: a semiconductor switching element, and a reactor connected in series therewith.
Claim 4
Dependent Claim
19 words
A secondary arc extinction device as recited in claim 2, wherein said semiconductor switching element comprises: anti-parallel connected thyristors.
Claim 5
Dependent Claim
22 words
A secondary arc extinction device as recited in claim 1, further comprising: a filter connected to said secondary winding of said transformer.
Claim 6
Dependent Claim
25 words
A secondary arc extinction device as recited in claim 1, wherein said second reactance means are provided with each phase of said electric power line.
Claim 7
Dependent Claim
101 words
A secondary arc extinction device as recited in claim 3, further comprising: a current transformer connected to said bus bar; a potential transformer connected to said bus bar; a circuit breaker having an auxiliary contact connected between said bus bar and said electric power line for activating said protective relaying means; an OR gate connected to said current transformer, said potential transformer, said protective relaying means and said auxiliary contact of circuit breaker; and means for setting the firing angle of said thyristors of said second reactance means to a predetermined value in response to an output of said OR gate.
Claim 8
Dependent Claim
122 words
A secondary arc extinction device as recited in claim 3, further comprising: a current transformer connected to said bus bar; a potential transformer connected to said bus bar; a ground protective relaying means connected to said bus bar; a circuit breaker having an auxiliary contact connected between said bus bar and said electric power line for activating said ground protective relaying means; an OR gate connected to said current transformer, said potential transformer and said auxiliary contact of circuit breaker; an AND gate connected to said OR gate and said ground protective relaying means; and means for setting the firing angle of said thyristors of said second reactance means to a predetermined value in response to an output of said AND gate.
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) | 1987-08-07 | 1988-02-06 | 1988-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-07 | 1992-02-06 | 1992-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-07 | 1996-02-06 | 1996-08-07 | $7700.00 | Window Closed / Lapsed |