Patent DE2245196C3 successfully refreshed from Google Patents.
US4307336A
Expired / Lapsed
US
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Process and system for the determination of a longitudinal equivalent reactance in an electric power supply line
Assignee: BBC Brown Boveri AG Switzerland
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Filing: 1980-03-19
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Granted: 1981-12-22
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Expires: 2000-03-19
Abstract
Abstract A process and system for the purpose of running and controlling electrical high-voltage power lines, particularly of the pertinent generators, wherein a line identification is required with the determination of the longitudinal equivalent reactance of each line section coupled with a measuring point or with a generator connected there, the generator being represented by this longitudinal reactance between the measuring point and a point on the line with amplitude and phase-rigid line voltage. The reactance is determined continuously from the local measured dimensions (P, Q, V 1 ) by using a majority of predetermined values (X e1 -X e3 ) of the searched for reactance through similarity comparison of the time developents of phase angle differences (d 1 to d 3 ) formed by the predetermined values (X e1 -X e3 ) and the local phase angle (d m ).
Inventors
- 👤 Peter Bonanomi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:07
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/02; G01R27/16
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
304 words
A process for the determination of a longitudinal equivalent reactance in an electric power supply line with reference to a measuring point, particularly at the connecting point of a generator in a supply line, comprising: forming at the measuring point (x m ), measuring signals for the system voltage (V 1 ), real power (P) and apparent power (Q) as well as for the phase angle (d m ) of the system voltage (V 1 ) relative to a local reference (V r ); forming a plurality of values (X e1 , X e2 , X e3 ) of the equivalent reactance to be determined in advance and determining a pertinent phase angle difference of the system voltage (d 1 to d 3 ) for each of these values with the help of the measuring signals for system voltage (V 1 ), real and apparent power (P or Q, respectively); comparing the course of each phase angle difference of the system voltage (d 1 to d 3 ) with that of the phase angle (d m ) of the power voltage (V 1 ) at the measuring point (x m ) and forming respective correlation characteristics (K 1 to K 3 ) based thereon; subjecting the correlation characteristics (K 1 to K 3 ) to a limit value selection wherein that phase angle difference of the system (d 1 to d 3 ) which is closest in similarity to the phase angle (d m ) of the system voltage (V 1 ) is identified; outputting the respective equivalent reactance value (X e1 , X e2 , X e3 ) associated with the phase angle difference of the system (d 1 to d 3 ) identified as being closest in similarity to the phase angle (d m ) of the system voltage (V 1 ).
Claim 2
Dependent Claim
304 words
A process for the determination of a longitudinal equivalent reactance in an electric power supply line with reference to a measuring point, particularly at the connecting point of a generator in a supply line, comprising: forming at the measuring point (x m ), measuring signals for the system voltage (V 1 ), real power (P) and apparent power (Q) as well as for the phase angle (d m ) of the system voltage (V 1 ) relative to a local reference (V r ); forming a plurality of values (X e1 , X e2 , X e3 ) of the equivalent reactance to be determined in advance and determining a pertinent phase angle difference of the system voltage (d 1 to d 3 ) for each of these values with the help of the measuring signals for system voltage (V 1 ), real and apparent power (P or Q, respectively); comparing the course of each phase angle difference of the system voltage (d 1 to d 3 ) with that of the phase angle (d m ) of the power voltage (V 1 ) at the measuring point (x m ) and forming respective correlation characteristics (K 1 to K 3 ) based thereon; subjecting the correlation characteristics (K 1 to K 3 ) to a limit value selection wherein that phase angle difference of the system (d 1 to d 3 ) which is closest in similarity to the phase angle (d m ) of the system voltage (V 1 ) is identified; outputting the respective equivalent reactance value (X e1 , X e2 , X e3 ) associated with the phase angle difference of the system (d 1 to d 3 ) identified as being closest in similarity to the phase angle (d m ) of the system voltage (V 1 ).
Claim 3
Dependent Claim
99 words
A process according to claim 1, further comprising: storing the course of the system voltage phase angle (d m ) at the measuring point (x m ) and of the system voltage phase angle differences (d 1 to d 3 ) in sections in accordance with the advance equivalent reactance values (X e1 to X e3 ) or corresponding defining quantities; and performing an integral similitude check always through such a section at the measuring point between the individual system voltage phase angle differences (d 1 to d 3 ) and the system voltage phase angle (d m ).
Claim 4
Dependent Claim
68 words
A process according to claim 2 further comprising: performing a difference formation between system voltage phase angle (d m ), on the one hand, and one system voltage phase angle difference (d 1 to d 3 ) each, on the other hand, as well as an integral correlation with one of the difference-forming quantities (d m or d 1 to d 3 , respectively) for the similitude checking.
Claim 5
Dependent Claim
46 words
A process according to claim 2 further comprising: performing a current, step-by-step renewal of the respectively stored sectional courses with the storage of always an up-to-date, new value and the cancellation of the stored value having been in the storage for the longest period of time.
Claim 6
Dependent Claim
49 words
A process according to claims 1, 2, 3 or 4, further comprising: filtering the time behavior of the system voltage phase angle (d m ) and that of the system in a filter characterized by a transfer function having differential components for the suppression of components linear in time.
Claim 7
Dependent Claim
27 words
A process according to claim 5, wherein said filtering step comprises: filtering by means of a filter characterized by a transfer function having differential and integral components.
Claim 8
Dependent Claim
59 words
A system for the determination of the phase angle (d m ) of a system voltage (V 1 ) at a measuring point (x m ), particularly for the performance of a process according to claim 1, comprising: a measuring device for the phase angle difference measurement and including an at least approximately fixed oscillator as a reference indicator.
Claim 9
Dependent Claim
28 words
A system according to claim 6, further comprising: said phase angle difference measuring device comprising a filter exhibiting a transfer function characterized at least by a differential component.
Claim 10
Dependent Claim
17 words
A system according to claim 8, wherein said filter transfer function is further characterized by integral components.
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) | 1984-12-21 | 1985-06-22 | 1985-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-21 | 1989-06-22 | 1989-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-21 | 1993-06-22 | 1993-12-22 | $7700.00 | Window Closed / Lapsed |