Patent US3801870A successfully refreshed from Google Patents.
US3801870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transient voltage limiter for series capacitors
Assignee: ABB Inc USA
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Filing: 1973-03-06
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Granted: 1974-04-02
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Expires: 1993-03-06
Abstract
Abstract A series capacitor installation having means for limiting transient voltages occurring upon reinsertion of the capacitor in the line after it has been bypassed by its protective equipment. For this purpose a resistor is placed in parallel with the capacitor during reinsertion, and means are provided for connecting the resistor in the circuit immediately upon bypassing the capacitor and for disconnecting the resistor at a predetermined time after the bypass has been removed.
Inventors
- 👤 L Grove
- 👤 J Santilli
- 👤 J Harder
- 👤 R Kennon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:31
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/16
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
62 words
In a series capacitor installation having a capacitor bank adapted to be connected in series in an alternating current transmission line, means for bypassing said capacitor bank under predetermined conditions, means for connecting a resistor across the capacitor bank upon establishment of said bypass of the capacitor bank, and means for disconnecting the resistor a predetermined time after removal of the bypass.
Claim 2
Dependent Claim
62 words
In a series capacitor installation having a capacitor bank adapted to be connected in series in an alternating current transmission line, means for bypassing said capacitor bank under predetermined conditions, means for connecting a resistor across the capacitor bank upon establishment of said bypass of the capacitor bank, and means for disconnecting the resistor a predetermined time after removal of the bypass.
Claim 3
Dependent Claim
13 words
The combination of claim 1 in which said resistor is a non-linear resistor.
Claim 4
Dependent Claim
32 words
The combination of claim 1 in which a plurality of resistors are connected across the capacitor bank substantially simultaneously, and including means for disconnecting said resistors sequentially after different predetermined time delays.
Claim 5
Dependent Claim
11 words
The combination of claim 3 in which the resistors are non-linear.
Claim 6
Dependent Claim
72 words
A series capacitor installation including a capacitor bank adapted to be connected in series in an alternating current transmission line, protective means for bypassing the capacitor bank in response to predetermined abnormal conditions, means for effecting connection of a resistor across the capacitor bank in response to operation of said protective means, and means for effecting disconnection of said resistor after a predetermined time delay in response to removal of said bypass.
Claim 7
Dependent Claim
72 words
A series capacitor installation including a capacitor bank adapted to be connected in series in an alternating current transmission line, protective means for bypassing the capacitor bank in response to predetermined abnormal conditions, means for effecting connection of a resistor across the capacitor bank in response to operation of said protective means, and means for effecting disconnection of said resistor after a predetermined time delay in response to removal of said bypass.
Claim 8
Dependent Claim
13 words
The combination of claim 5 in which said resistor is a non-linear resistor.
Claim 9
Dependent Claim
40 words
The combination of claim 5 in which said resistor comprises a plurality of individual resistors simultaneously connected in parallel across the capacitor bank and in which said disconnecting means effects disconnection of the individual resistors sequentially after different time delays.
Claim 10
Dependent Claim
13 words
The combination of claim 7 in which said individual resistors are non-linear resistors.
Claim 11
Dependent Claim
30 words
The combination of claim 5 in which said protective means is a spark gap device adapted to arc over and bypass the capacitor bank in response to a predetermined overvoltage.
Claim 12
Dependent Claim
24 words
The combination of claim 9 in which said resistor is connected across the capacitor bank in response to current flow through said gap device.
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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |