Device for generating an AC ramp for checking the tripping current of a circuit-breaker
US4611174A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 30, 1984 |
| Grant date | Sep 9, 1986 |
| Priority date | — |
| Expiry date | Jan 30, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/044
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A device is provided for generating an AC current ramp for checking the tripping current of the circuit-breaker, in which the current is regulated by a power transistor driven by the voltage available at the middle point of a potentiometric divider, this latter comprising a field effect transistor which is itself driven by a voltage depending on the voltage at the terminals of a capacitor charged by an auxiliary battery. It further comprises a constant current generator which is fed with current by the auxiliary battery for charging said capacitor and a comparator amplifier a first input of which is connected to said capacitor, a second input of which is connected to the junction point between a measuring resistor and said power transistor and the output of which is connected to the gate of said field effect transistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.