Detection of unsafe voltages on mobile equipment
US4791517A · kind A · utility
6Cited by
1References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 30, 1987 |
| Grant date | Dec 13, 1988 |
| Priority date | — |
| Expiry date | Sep 30, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/14
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Protective equipment detects the existence of an unsafe potential (V.sub.2) between earth and mobile equipment such as a mobile cabin. A metal plate (14) is mounted below the chassis (10) of the cabin, and the voltage (V.sub.3) between the metal plate (14) and the chassis (10) is detected by an amplifier (16). The amplifier output feeds a threshold detector (18) which senses when the voltage (V.sub.3) reaches a level corresponding to a predetermined dangerous potential (V.sub.2) of the chassis (10) with respect to ground (12).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.