Partial discharge measuring means including discharge detecting circuits and a discharge detector connected thereto and including a selector circuit
Abstract
Abstract A MEANS FOR MEASURING PARTIAL DISCHARGE OF ELECTRICAL EQUIPMETS, SUCH AS ELECTRIC CABLES AND TRANSFORMERS, HAVING A SPECIAL DISCHARGE DETECTOR, IN WHICH A DETECTION CIRCUIT IS FORMED BY TEST OBJECTS, COUPLING CONDENSERS, AND DETECTION IMPEDANCES. A DEFECT IN THE TEST OBJECT PRODUCES PARTIAL DISCHARGE, WHICH MAY BE MEASURED AS DISCHARGE PULSES IN THE DISCHARGE DETECTOR. TO KEEP EXTERNAL DISTURBANCES FROM HAMPERING MEASUREMENT OF PARTIAL DISCHARGE, PULSES FROM THE TEST OBJECT AND THE COUPLING CONDENSER, AFTER BEING SHAPED RESPECTIVELY, ARE LED INTO A DIFFERENTIAL AMPLIFIER WHERE EXTERNAL NOISES CANCEL EACH OTHER. DISCHARGE MEASUREMENT CAN THEREFORE BE MADE WITHOUT BEING HAMPERED BY EXTERNAL DISTURBANCES.
Inventors
- 👤 Hironori Matsuba
Bibliographic Details
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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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |