US3287636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus including condenser means for measuring the insulation from earth of electrical networks
Assignee: Charbonnages de France CDF
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Filing: 1963-07-19
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Granted: 1966-11-22
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Expires: 1983-07-19
Abstract
No abstract record available.
Inventors
- 👤 Gagniere Claude
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:57
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/02; G01R27/16; G01R27/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
204 words
A METHOD OF MEASURING THE INSULATING RESISTANCE TO EARTH OF AN ALTERNATING ELECTRICAL NETWORK WITH AN INSULATED NEUTRAL PERMITTING A FAITHFUL INDICATION TO BE OBTAINED WHICH CAN BE TRANSMITTED TO A DISTANCE, IRRESPECTIVE OF THE VARIATIONS OF VOLTAGE OF SAID NETWORK, SAID METHOD CONSISTING OF: SUPPLYING AT THE TERMINALS OF A FIRST CIRCUIT A VOLTAGE PROPORTIONAL TO THE VOLTAGE OF SAID NETWORK; CAUSING A POLARIZED CURRENT TO FLOW IN AN ELECTRICAL COUPLING CIRCUIT BETWEEN THE PHASES OF THE NETWORK AND EARTH; DERIVING FROM SAID COUPLING CIRCUIT A VOLTAGE PROPORTIONAL TO THE CURRENT FLOWING IN SAID COUPLING CIRCUIT AND SUPPLYING SAID VOLTAGE TO THE TEMINALS OF A SECOND CIRCUIT; CONNECTING A CONDENSER TO THE TERMINALS OF SAID FIRST CIRCUIT AND CHARGING SAID CONDENSER TO THE VALUE OF THE VOLTAGE PROPORTIONAL TO THE NETWORK VOLTAGE; CONNECTING SAID CONDENSER TO THE TERMINALS OF SAID SECOND CIRCUIT AND DISCHARGING SAID CONDENSER TO THE VALUE OF THE VOLTAGE PROPORTIONA TO THAT OF THE CURRENT FLOWING IN THE POLARIZED COUPLING CIRCUIT BETWEEN THE PHASES OF THE NETWORK AND EARTH; MEASURING THE TIME TAKE FOR THE CONDENSER TO DISCHARGE INTO SAID SECOND CIRCUIT; AND UTILIZING THE DISCHARGE TIME OF SAID CONDENSER AS A FUNCTION OF THE INSULATION RESISTANCE OF THE NETWORK.
Claim 2
Independent Claim
204 words
A METHOD OF MEASURING THE INSULATING RESISTANCE TO EARTH OF AN ALTERNATING ELECTRICAL NETWORK WITH AN INSULATED NEUTRAL PERMITTING A FAITHFUL INDICATION TO BE OBTAINED WHICH CAN BE TRANSMITTED TO A DISTANCE, IRRESPECTIVE OF THE VARIATIONS OF VOLTAGE OF SAID NETWORK, SAID METHOD CONSISTING OF: SUPPLYING AT THE TERMINALS OF A FIRST CIRCUIT A VOLTAGE PROPORTIONAL TO THE VOLTAGE OF SAID NETWORK; CAUSING A POLARIZED CURRENT TO FLOW IN AN ELECTRICAL COUPLING CIRCUIT BETWEEN THE PHASES OF THE NETWORK AND EARTH; DERIVING FROM SAID COUPLING CIRCUIT A VOLTAGE PROPORTIONAL TO THE CURRENT FLOWING IN SAID COUPLING CIRCUIT AND SUPPLYING SAID VOLTAGE TO THE TEMINALS OF A SECOND CIRCUIT; CONNECTING A CONDENSER TO THE TERMINALS OF SAID FIRST CIRCUIT AND CHARGING SAID CONDENSER TO THE VALUE OF THE VOLTAGE PROPORTIONAL TO THE NETWORK VOLTAGE; CONNECTING SAID CONDENSER TO THE TERMINALS OF SAID SECOND CIRCUIT AND DISCHARGING SAID CONDENSER TO THE VALUE OF THE VOLTAGE PROPORTIONA TO THAT OF THE CURRENT FLOWING IN THE POLARIZED COUPLING CIRCUIT BETWEEN THE PHASES OF THE NETWORK AND EARTH; MEASURING THE TIME TAKE FOR THE CONDENSER TO DISCHARGE INTO SAID SECOND CIRCUIT; AND UTILIZING THE DISCHARGE TIME OF SAID CONDENSER AS A FUNCTION OF THE INSULATION RESISTANCE OF THE NETWORK.
References Cited (Backward Citations)
CA657057A
Cited
US3158785A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-21 | 1970-05-23 | 1970-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-21 | 1974-05-23 | 1974-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-21 | 1978-05-23 | 1978-11-22 | $7700.00 | Window Closed / Lapsed |