Ground fault interrupter with pulsed neutral-to-ground fault detector
阅读：682发布：2022-03-29
专利汇可以提供Ground fault interrupter with pulsed neutral-to-ground fault detector专利检索，专利查询，专利分析的服务。并且Apparatus for monitoring an alternating-current circuit having a differential current transformer to sense line-to-ground faults includes a pulsed ringing circuit for evidencing freedom of the alternating-current circuit from neutral-to-ground faults that could reduce the sensitivity of the line-to-ground fault detector.，下面是Ground fault interrupter with pulsed neutral-to-ground fault detector专利的具体信息内容。
1. Apparatus for monitoring an alternating current supply circuit having at least one line conductor, a neutral conductor, and means forming a ground-return, wherein said conductors extend from supply terminals to load terminals and wherein the neutral conductor has a ground connection to the ground-return, the monitoring apparatus including neutral-to-ground fault monitoring means having a differential current transformer having a core and primary windings forming series segments of said line and neutral conductors so arranged that load current carried thereby tends to produce mutually cancelling flux in said core, the differential current transformer being disposed between said ground connection and said load terminals, resonant means resonant at a higher frequency than that of the alternating current supply circuit including a further winding linking said core and a capacitor connected to said further winding, means for periodically pulsing said resonant means, and fault-evidencing means coupled to said transformer for responding thereto in one manner to indicate normal operation when the resonant means rings at least at a minimum amplitude for a prescribed period after each pulse of the pulsing means and for responding thereto differently to indicate abnormal operation in the event of a fault between the neutral conductor and the ground-return means at the load-terminal side of said transformer causing damping of the resonant means and decay of the ringing below said minimum amplitude during said period.
2. Monitoring apparatus in accordance with claim, 1, wwherein said neutral-to-ground fault evidencing means and said resonant means include said further winding in common.
3. Monitoring apparatus in accordance with claim 1, wherein said pulsing means is coupled to the alternating current supply circuit to be synchronized therewith.
4. Monitoring apparatus in accordance with claim 1, wherein said fault-evidencing means includes a transistor pulsed into saturation at the ringing frequency so long as the minimum ringing amplitude is sustained.
5. Monitoring apparatus in accordance with claim 4, further including time-constant circuit means restraining response to the transistor for intervals only slightly longer than the period of the ringing frequency.
6. Monitoring apparatus in accordance with claim 1, further including means coupled to the differential current transformer for evidencing the appearance of a line-to-ground fault which causes flux unbalance in said core at the frequency of the alternating current circuit.
7. Monitoring apparatus in accordance with claim 6, wherein said neutral-to-ground fault evidencing means and said line-to-ground fault evidencing means and said resonant means include said further winding in common.
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