US3348097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacitor bank having unbalance detecting protective means
Assignee: McGraw Edison Co
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Filing: 1965-03-01
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Granted: 1967-10-17
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Expires: 1985-03-01
Abstract
No abstract record available.
Inventors
- 👤 Donald J Lemens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:08
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
IN A THREE PHASE CAPACITOR BANK COMPRISING A PLURALITY OF CAPACITOR UNITS AND HAVING THREE PHASE SWITCH MEANS FOR CONNECTING SAID CAPACITOR UNITS IN STAR TO A POLYPHASE POWER SYSTEM, MEANS INCLUDING A POTENTIAL TRANSFORMER HAVING ITS PRIMARY WINDING CONNECTED BETWEEN THE NEUTRAL OF SAID STAR-CONNECTED CAPACITOR UNITS AND GROUND FOR DETECTING UNBALANCE IN THE PHASES OF SAID POLYPHASE CAPACITOR BANK, AND MEANS FOR PREVENTING THE VOLTAGE OF SAID NEUTRAL FROM EXCEEDING A PREDETERMINED MAGNITUDE RELATIVE TO GROUND DURING NORMAL OPERATION AND DURING SWITCHING OF SAID BANK INCLUDING A SPARK GAP CONNECTED BETWEEN SAID NEUTRAL AND GROUND AND A NORMALLY OPEN SWITCH ALSO CONNECTED BETWEEN SAID NEUTRAL AND GROUND AND CONSTRUCTED AND ARRANGED TO BE CLOSED WHEN SAID THREE PHASE SWITCH MEANS IS BEING OPERATED BETWEEN OPEN AND CLOSED POSITIONS.
Claim 2
Dependent Claim
130 words
IN A THREE PHASE CAPACITOR BANK COMPRISING A PLURALITY OF CAPACITOR UNITS AND HAVING THREE PHASE SWITCH MEANS FOR CONNECTING SAID CAPACITOR UNITS IN STAR TO A POLYPHASE POWER SYSTEM, MEANS INCLUDING A POTENTIAL TRANSFORMER HAVING ITS PRIMARY WINDING CONNECTED BETWEEN THE NEUTRAL OF SAID STAR-CONNECTED CAPACITOR UNITS AND GROUND FOR DETECTING UNBALANCE IN THE PHASES OF SAID POLYPHASE CAPACITOR BANK, AND MEANS FOR PREVENTING THE VOLTAGE OF SAID NEUTRAL FROM EXCEEDING A PREDETERMINED MAGNITUDE RELATIVE TO GROUND DURING NORMAL OPERATION AND DURING SWITCHING OF SAID BANK INCLUDING A SPARK GAP CONNECTED BETWEEN SAID NEUTRAL AND GROUND AND A NORMALLY OPEN SWITCH ALSO CONNECTED BETWEEN SAID NEUTRAL AND GROUND AND CONSTRUCTED AND ARRANGED TO BE CLOSED WHEN SAID THREE PHASE SWITCH MEANS IS BEING OPERATED BETWEEN OPEN AND CLOSED POSITIONS.
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) | 1970-10-16 | 1971-04-17 | 1971-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-16 | 1975-04-17 | 1975-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-16 | 1979-04-17 | 1979-10-17 | $7700.00 | Window Closed / Lapsed |