Patent US5029039A successfully refreshed from Google Patents.
US5029039A
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Current adaptive fault indicator
Assignee: ABB Installation Products International LLC
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Filing: 1989-08-07
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Granted: 1991-07-02
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Expires: 2009-08-07
Abstract
Abstract A fault indicator which senses current in a cable, resets in response to a minimum current and arms a trip arrangement in response to current rising a predetermined amount with respect to time. If the rising current also opens a circuit breaker within a predetermined time and cuts off current to the cable, the indicator trips. If no zero current occurs within the time period, the trip arrangement is disarmed for the next current rise.
Inventors
- 👤 Thomas Yeh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:32
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/08; G01R31/081; G01R31/083; G01R19/00; G01R19/165; G01R19/16533; G01R19/16538; G01R19/16566; G01R19/16585; H; H02; H02H; H02H3/00; H02H3/02; H02H3/04; H02H3/042; H02H3/44
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
65 words
A fault indicator comprising: sensing means for sensing current in a cable; reset means responsive to said sensing means for producing a reset indication in response to a minimum current; trip means responsive to said sensing means for producing a trip indication in response to both the current rising a predetermined amount with respect to time and a subsequent drop in current to substantially zero.
Claim 2
Dependent Claim
65 words
A fault indicator comprising: sensing means for sensing current in a cable; reset means responsive to said sensing means for producing a reset indication in response to a minimum current; trip means responsive to said sensing means for producing a trip indication in response to both the current rising a predetermined amount with respect to time and a subsequent drop in current to substantially zero.
Claim 3
Dependent Claim
57 words
A fault indicator as in claim 1, wherein: said trip means includes: rate detecting means responsive to said sensing means for detecting a selected rate of current rise above a given rate; zero detecting means responsive to said sensing means for detecting a zero current in the cable after said rate detecting means detects the selected rate.
Claim 4
Dependent Claim
93 words
A fault indicator as in claim 1 wherein: said trip means includes: first integrating means having a first integrating rate; second integrating means having a second integrating rate slower than said first changing rate; comparator means for comparing a smaller proportion of the first integrating means with a larger proportion of the second integrating means for producing a first signal when the smaller proportion exceeds the larger proportion; and means responsive to the drop in current to substantially zero and said first signal for producing a trip signal to produce a trip indication.
Claim 5
Dependent Claim
92 words
A fault indicator as in claim 2 wherein: said trip includes: first integrating means having a first integrating rate; second integrating means having a second integrating rate slower than said first changing rate; comparator means for comparing a smaller proportion of the first integrating means with a larger proportion of the second integrating means for producing a first signal when the smaller proportion exceeds the larger proportion; and means responsive to the drop in current to substantially zero and said first signal for producing a trip signal to produce a trip indication.
Claim 6
Dependent Claim
15 words
A fault indicator as in claim 3, wherein: the integrating rate is a changing rate.
Claim 7
Dependent Claim
15 words
A fault indicator as in claim 4, wherein: the integrating rate is a changing rate.
Claim 8
Dependent Claim
36 words
A fault indicator as in claim 1, wherein: said trip means includes inrush restraint means for restraining a trip indication for a given time in response to a rise in current from below the minimum current.
Claim 9
Dependent Claim
36 words
A fault indicator as in claim 2, wherein: said trip means includes inrush restraint means for restraining a trip indication for a given time in response to a rise in current from below the minimum current.
Claim 10
Dependent Claim
36 words
A fault indicator as in claim 3, wherein: said trip means includes inrush restraint means for restraining a trip indication for a given time in response to a rise in current from below the minimum current.
Claim 11
Dependent Claim
36 words
A fault indicator as in claim 4, wherein: said trip means includes inrush restraint means for restraining a trip indication for a given time in response to a rise in current from below the minimum current.
Claim 12
Dependent Claim
36 words
A fault indicator as in claim 5, wherein: said trip means includes inrush restraint means for restraining a trip indication for a given time in response to a rise in current from below the minimum current.
Claim 13
Dependent Claim
36 words
A fault indicator as in claim 6, wherein: said trip means includes inrush restraint means for restraining a trip indication for a given time in response to a rise in current from below the minimum current.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-01 | 1994-12-31 | 1995-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-01 | 1998-12-31 | 1999-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-01 | 2002-12-31 | 2003-07-02 | $7700.00 | Window Closed / Lapsed |