US3567954A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interconnecting means for electric power systems
Assignee: Toshiba Corp
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Filing: 1969-08-25
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Granted: 1971-03-02
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Expires: 1989-08-25
Abstract
Abstract An interconnecting means for AC electric power systems is composed of a plurality of DC excited saturable reactors located within a tie line connecting said electric power systems. These DC excited saturable reactors are arranged between the corresponding phase lines, as well as between the different phase lines, of the tie line. Thus in the normal state where there is little phase difference between the interconnected power systems, only the reactors disposed between the corresponding phase lines are reduced in impedance by regulating their DC excitation so as to allow sufficient power to flow therethrough. But under the stepout condition between said power systems, all the saturable reactors are controlled in DC excitation to have their impedance reduced in turn according to the degree of the phase difference between said interconnected power systems, whereby the tie line power flows across those phase lines of the tie line which have the smallest phase difference.
Inventors
- 👤 Tsuneo Mitsui
- 👤 Muneyuki Udo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:24
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/28; H02J3/30; H02J3/04; H02J3/06; Y; Y02; Y02E; Y02E60/00; Y02E60/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
110 words
An interconnecting means for electric power systems comprising a plurality of groups of saturable reactors connectIng the corresponding, as well as different, phase of a tie line interposed between two power systems respectively, a detector for detecting the tie line power introduced through said variable reactors, a phase difference detector for detecting the phase difference defined by both power systems and a control device for selectively determining the operating condition of said groups of saturable reactors with outputs from said tie line power detector and phase difference detector and controlling the reactance of said variable reactors, thereby controlling the value of a tie line power introduced across said two systems.
Claim 2
Dependent Claim
110 words
An interconnecting means for electric power systems comprising a plurality of groups of saturable reactors connectIng the corresponding, as well as different, phase of a tie line interposed between two power systems respectively, a detector for detecting the tie line power introduced through said variable reactors, a phase difference detector for detecting the phase difference defined by both power systems and a control device for selectively determining the operating condition of said groups of saturable reactors with outputs from said tie line power detector and phase difference detector and controlling the reactance of said variable reactors, thereby controlling the value of a tie line power introduced across said two systems.
Claim 3
Dependent Claim
16 words
An interconnecting means according to claim 1 wherein said variable reactors are DC excited saturable ones.
Claim 4
Dependent Claim
59 words
An interconnecting means according to claim 1 wherein said tie line power detector is supplied with inputs from the potential transformers connected to said tie lines and those from the current transformers connected to a circuit comprising said variable reactors and detects said tie line power in the form of an electric quantity proportionate to said tie line power.
Claim 5
Dependent Claim
227 words
An interconnecting means according to claim 1 wherein said control device for controlling the tie line power by supplying said variable reactors with control power comprises a maximum tie line power setter for setting the maximum value of a tie line power passing through said variable reactors in a manner to restrict it; a comparator provided for each phase for comparing first outputs detected by the tie line power detector with second outputs from the maximum tie line power setter and generating third outputs having a magnitude proportionate to the difference between said first outputs and the value previously set by said maximum tie line power setter; a maximum tie line current setter for setting the maximum value of tie line current in a manner to restrict the reactance of said variable reactors and supply them with a maximum DC exciting current in the normal operation of said power systems; an amplifier provided for each phase for comparing the third outputs from said voltage comparators with the fourth outputs from said maximum tie line current setter, thereby adjusting said DC exciting current according to said third outputs; and a contact means controlled according to the phase difference detected by said phase difference detector for supplying only the prescribed ones involved in said plurality of groups of variable reactors with a DC exciting current for their selective operation.
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |