US4470005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Static VAR generator having a thyristor circuit arrangement providing reduced losses
Assignee: ASEA BROWN BOVERI Inc
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Filing: 1982-11-02
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Granted: 1984-09-04
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Expires: 2002-11-02
Abstract
Abstract An auxiliary thyristor control circuit inserts a zinc oxide varistor in series with the capacitor bank of a static VAR generator for discharging the capacitor bank when the static VAR generator is subjected to high transient voltages.
Inventors
- 👤 Laszlo Gyugyi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:09
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/18; H02J3/1821; H02J3/1835; H02J3/1864; Y; Y02; Y02E; Y02E40/00; Y02E40/10
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
88 words
A static VAR generator, comprising: (a) a capacitance means disposed for connection into an AC network; (b) a monitoring means for monitoring the capacitive requirements of said AC network; (c) a control means having antiparallel connected thyristors for connection of said capacitance means into the AC network in response to the capacitive requirements of the AC network; and (d) an auxiliary control means having antiparallel thyristors to connect a zinc oxide variator means for discharging the capacitance means when the AC network is subject to high transient voltages.
Claim 2
Dependent Claim
88 words
A static VAR generator, comprising: (a) a capacitance means disposed for connection into an AC network; (b) a monitoring means for monitoring the capacitive requirements of said AC network; (c) a control means having antiparallel connected thyristors for connection of said capacitance means into the AC network in response to the capacitive requirements of the AC network; and (d) an auxiliary control means having antiparallel thyristors to connect a zinc oxide variator means for discharging the capacitance means when the AC network is subject to high transient voltages.
Claim 3
Dependent Claim
35 words
A static VAR generator as recited in claim 1 wherein the auxiliary control means is further comprised of breakover diodes for firing the thyristors when the voltage across the breakover diodes exceeds a predetermined value.
References Cited (Backward Citations)
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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) | 1987-09-04 | 1988-03-05 | 1988-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-04 | 1992-03-05 | 1992-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-04 | 1996-03-05 | 1996-09-04 | $7700.00 | Window Closed / Lapsed |