US3952138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power control system for electric arc or refining furnace electrically directly coupled to independent power generating unit or units
Assignee: IHI Corp
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Filing: 1974-10-16
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Granted: 1976-04-20
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Expires: 1994-10-16
Abstract
Abstract A power control system is disclosed for an electric arc or refining furnace circuit to which is supplied power directly from an independent power generating unit or units installed independently of a publicly available power supply system or any other power generating unit. Depending upon the operating conditions of the furnace, the power supply is controlled by the suitable adjustment of the generator voltage or frequency or by the combination thereof based upon the relations V = K.Φ.n where V = generator voltage, K = constant, Φ = flux density and n = operating speed of a prime mover mechanically coupled to each generator, and f = p.n/60 where f = frequency, and p = number of poles in each generator.
Inventors
- 👤 Toshio Nanjyo
- 👤 Shozo Yasukawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:23
CPC Classifications
H; H05; H05B; H05B7/00; H05B7/005
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
78 words
A power control system for controlling the power supply to an electric heating load of an electric arc furnace independently of any line source comprising an independent, self-contained power generating unit including a prime mover and generator for furnishing power to said load, means for sensing changes in the operating conditions of said furnace, and means controlled by said sensing means for adjusting the power output of said generator to thereby control the power furnished to said load.
Claim 2
Dependent Claim
78 words
A power control system for controlling the power supply to an electric heating load of an electric arc furnace independently of any line source comprising an independent, self-contained power generating unit including a prime mover and generator for furnishing power to said load, means for sensing changes in the operating conditions of said furnace, and means controlled by said sensing means for adjusting the power output of said generator to thereby control the power furnished to said load.
Claim 3
Dependent Claim
54 words
A power control system as defined in claim 1 wherein the power control is made by the adjustment of the frequency ( = p.n/60 Hz, where p = number of poles of generator and n = operating speed of a prime mover coupled to said generator) depending upon the operating conditions of said furnace.
Claim 4
Dependent Claim
55 words
A power control system as defined in claim 1 wherein the power control is made by the adjustment of the generator voltage ( = K.Φ.n, where K = constant, Φ = flux density and n = operating speed of a prime mover mechanically coupled to each generator) depending upon the operating conditions of said furnace.
Claim 5
Dependent Claim
35 words
A power control system as defined in claim 2 wherein the power control is made by suitably selecting the frequency of the generator voltage of the generator depending upon the operating conditions of said furnace.
Claim 6
Dependent Claim
32 words
A power control system as defined in claim 3 wherein the power control is made by suitably adjusting the generator voltage of the generator depending upon the operation conditions of said furnace.
Claim 7
Dependent Claim
38 words
A power control system as defined in claim 1 wherein a saturable reactor is placed between each independent power generating unit and said electric heating load for the power control depending upon the operating conditions of said furnace.
Claim 8
Dependent Claim
37 words
A power control system as defined in claim 6 wherein the power control is made by the suitable selection of the frequency of the generator voltage of the generator depending upon the operation conditions of said furnace.
Claim 9
Dependent Claim
32 words
. A power control system as defined in claim 6 wherein the power control is made by the suitable selection of the generator voltage depending upon the operating conditions of said furnace.
Claim 10
Dependent Claim
41 words
A power control system as defined in claim 6 wherein the power control is made by the suitable selection of the frequency of the generator voltage of each generator for each electrode in said furnace depending upon the operation conditions thereof.
Claim 11
Dependent Claim
38 words
A power control system as defined in claim 6 wherein the power control is made by the suitable selection of the generator voltage of each generator for each electrode in said furnace depending upon the operating conditions thereof.
References Cited (Backward Citations)
US3183294A
Cited
US3743752A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-20 | 1979-10-20 | 1980-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-20 | 1983-10-20 | 1984-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-20 | 1987-10-20 | 1988-04-20 | $7700.00 | Window Closed / Lapsed |