Alarm system and method for detecting proximity of an object to electrical power lines
US4675664A · kind A · utility
71Cited by
2References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 7, 1986 |
| Grant date | Jun 23, 1987 |
| Priority date | — |
| Expiry date | Apr 7, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B21/18
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An antenna receives, by capacitive effect, a current of which the intensity is a function of the distance separating the antenna from an electrical power line. The other factors that influence the current are fixed, constant or are considered negligible. A measuring and conditioning circuit converts the current at the output of the antenna into a coded signal and transmits this coded signal to a control unit. The control unit compares the coded signal to predetermined values stored therein. Alarms are generated by the control unit when the current from the antenna exceeds the predetermined values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.