Current adaptive fault indicator
US5029039A · kind A · utility
24Cited by
6References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 7, 1989 |
| Grant date | Jul 2, 1991 |
| Priority date | — |
| Expiry date | Aug 7, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/44
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A fault indicator which senses current in a cable, resets in response to a minimum current and arms a trip arrangement in response to current rising a predetermined amount with respect to time. If the rising current also opens a circuit breaker within a predetermined time and cuts off current to the cable, the indicator trips. If no zero current occurs within the time period, the trip arrangement is disarmed for the next current rise.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.