Circuit arrangement for superposing starting conditions at an electrical operating means-simulator composed of RC-elements
US4000410A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 11, 1975 |
| Grant date | Dec 28, 1976 |
| Priority date | — |
| Expiry date | Nov 11, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H6/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A circuit arrangement for superposing or impressing starting conditions at an electrical operating means primary simulator composed of RC-elements wherein the primary simulator network is charged by a charging current functionally dependent upon an operating current to a charging voltage representative of the heating-up or thermal behavior of the operating means and the charging voltage appears at a low-ohmic or low-impedance output of a charging state-storage device for controlling an electronic operating means-protection relay. According to the invention, an auxiliary simulator composed of an RC-element, and the time-constant of which is greater than one-half the smallest time-constant of the primary simulator and smaller than twice the largest time-constant of the primary simulator, is connected by means of a switching means or device responsive to the supply voltage with the charging state-storage device when the protection relay-power supply is intact for adjusting the charging voltage of the auxiliary simulator-capacitor to the charging voltage of the primary simulator and is disconnected from undesired discharges in the case of a defective or faulty protection relay-power su…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.