US4996624A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fault location method for radial transmission and distribution systems
Assignee: Schweitzer Engineering Laboratories Inc
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Filing: 1989-09-28
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Granted: 1991-02-26
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Expires: 2009-09-28
Abstract
Abstract A method of locating a phase-to-ground fault in a radial distribution system with a tapped load. The method includes determining the positive-sequence impedance from the residual current, the residual current compensation factor and the phase-to-ground voltage of the faulted line. The positive-sequence impedance is then used to determine the distance to the fault.
Inventors
- 👤 Edmund O. Schweitzer, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:46
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/40; H02H3/402
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
56 words
A method for determining the positive-sequence impedance to a fault comprising: measuring the phase-to-ground voltage of the faulted line and the zero-sequence component of the fault current; determining the residual current and using the residual current (IR) and the residual current compensation factor (k) to determine the positive-sequence impedance by dividing said phase-to-ground voltage by IR×(1+k).
Claim 2
Independent Claim
56 words
A method for determining the positive-sequence impedance to a fault comprising: measuring the phase-to-ground voltage of the faulted line and the zero-sequence component of the fault current; determining the residual current and using the residual current (IR) and the residual current compensation factor (k) to determine the positive-sequence impedance by dividing said phase-to-ground voltage by IR×(1+k).
Claim 3
Independent Claim
104 words
A method of locating a phase-to-ground fault in a radial distribution circuit with at least one tapped load, comprising: measuring the phase-to-ground voltage of the faulted line and the zero-sequence component of the fault current; determining the residual current; using the residual current (IR) and the residual current compensation factor (k) to determine the positive-sequence impedance by dividing said phase-to-ground voltage by IR×(1+k) wherein the positive-sequence impedance includes the positive-sequence resistance and reactance; and determining the distance to the fault by dividing the positive-sequence reactance by the total reactance of the faulted line and multiplying that value by the total length of the line.
Claim 4
Independent Claim
104 words
A method of locating a phase-to-ground fault in a radial distribution circuit with at least one tapped load, comprising: measuring the phase-to-ground voltage of the faulted line and the zero-sequence component of the fault current; determining the residual current; using the residual current (IR) and the residual current compensation factor (k) to determine the positive-sequence impedance by dividing said phase-to-ground voltage by IR×(1+k) wherein the positive-sequence impedance includes the positive-sequence resistance and reactance; and determining the distance to the fault by dividing the positive-sequence reactance by the total reactance of the faulted line and multiplying that value by the total length of the line.
Claim 5
Dependent Claim
23 words
The method of claim 2 wherein the residual current compensation factor is determined from the positive-sequence and zero-sequence impedances of the faulted line.
Claim 6
Dependent Claim
19 words
The method of claim 2 wherein the residual current is determined from the zero-sequence component of the fault current.
References Cited (Backward Citations)
US4686601A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-25 | 1994-08-27 | 1995-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-25 | 1998-08-27 | 1999-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-25 | 2002-08-27 | 2003-02-26 | $7700.00 | Window Closed / Lapsed |