US4017790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alternating current power transmission systems
Assignee: Associated Electrical Industries Ltd
•
Filing: 1975-10-14
•
Granted: 1977-04-12
•
Expires: 1995-10-14
Abstract
Abstract An alternating current power transmission system employing a long transmission line has a stabilizing arrangement comprising a plurality of alternating current saturated reactors connected to intermediate stations along its length, at least some of the reactors having slope correction capacitors in series therewith, and others of the reactors having slope reactances which are not connected by series slope correction capacitors. Since the uncompensated reactors have a substantially instantaneous transient response the stabilizing arrangement gives an overall voltage control which is better than one incorporating only slope corrected reactors.
Inventors
- 👤 Erich Siegfried Friedlander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:20
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/18; H02J3/1821; H02J3/12; H02J3/16; Y; Y02; Y02E; Y02E40/00; Y02E40/30
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
94 words
An alternating current power transmission system including: a. a transmission line connected between a pair of mutually distant terminal stations; b. a plurality of intermediate stations located at spaced positions along the length of the transmission line between the terminal stations; c. a stabilising arrangement comprising a plurality of alternating current saturated reactors connected to the line at the intermediate stations; d. at least some of said reactors having slope correction capacitors connected in series therewith; and e. others of said reactors having slope reactances which are not compensated by series slope correction capacitors.
Claim 2
Dependent Claim
94 words
An alternating current power transmission system including: a. a transmission line connected between a pair of mutually distant terminal stations; b. a plurality of intermediate stations located at spaced positions along the length of the transmission line between the terminal stations; c. a stabilising arrangement comprising a plurality of alternating current saturated reactors connected to the line at the intermediate stations; d. at least some of said reactors having slope correction capacitors connected in series therewith; and e. others of said reactors having slope reactances which are not compensated by series slope correction capacitors.
Claim 3
Dependent Claim
46 words
A power transmission system as claimed in claim 1, wherein the reactors having slope correction capacitors connected in series therewith and the reactors having slope reactances which are not compensated by series slope correction capacitors are connected to the same intermediate stations on the transmission line.
Claim 4
Dependent Claim
50 words
A power transmission system as claimed in claim 1, wherein the reactors having slope correction capacitors connected in series therewith and the reactors having slope reactances which are not compensated by series slope correction capacitors are connected to different intermediate stations spaced apart along the length of the transmission line.
Claim 5
Dependent Claim
55 words
A power transmission system as claimed in claim 1, wherein the intermediate station associated with reactors having slope correction capacitors connected in series therewith, and those associated with reactors having slope reactances which are not compensated by series slope correction capacitors, alternate at intervals along at least part of the length of the transmission line.
Claim 6
Dependent Claim
34 words
A power transmission system as claimed in claim 1, wherein shunt connected boosting capacitors are connected to the transmission line at some or all of the intermediate stations at which the reactors are connected.
Claim 7
Dependent Claim
33 words
A power transmission system as claimed in claim 1, wherein shunt connected boosting capacitors are connected to the transmission line at locations other than the intermediate stations at which the reactors are connected.
Claim 8
Dependent Claim
34 words
A power transmission system as claimed in claim 1, wherein at least some of the slope-corrected reactors and/or the uncompensated reactors have rotating synchronous condensers connected in parallel with them at the respective stations.
Claim 9
Dependent Claim
34 words
A power transmission system as claimed in claim 1, wherein at least some of the slope-corrected reactors and/or the uncompensated reactors have rotating induction motors connected in parallel with them at the respective stations.
Claim 10
Dependent Claim
39 words
A power transmission system as claimed in claim 1, wherein the slope-corrected reactors and/or the uncompensated reactors are connected to a relatively low voltage winding of a step down transformer having a primary winding connected to the transmission line.
Claim 11
Dependent Claim
26 words
A power transmission system as claimed in claim 1, wherein the slope-corrected reactors and/or the uncompensated reactors have winding configuration connected directly to the transmission line.
Claim 12
Dependent Claim
30 words
A power transmission system as claimed in claim 1, wherein by-pass filters for damping out unwanted frequencies are connected in parallel with at least some of the slope correction capacitors.
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) | 1980-04-11 | 1980-10-11 | 1981-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-11 | 1984-10-11 | 1985-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-11 | 1988-10-11 | 1989-04-12 | $7700.00 | Window Closed / Lapsed |