Monitoring system for a capacitor battery in an AC voltage network
US4401942A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 20, 1981 |
| Grant date | Aug 30, 1983 |
| Priority date | — |
| Expiry date | May 20, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/44
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A monitoring system for a capacitor battery, the capacitor battery having a plurality of parallel legs, each with a plurality of sectional capacitors connected in series with fuses. Adjacent ones of the sectional capacitors are connected to one another by continuous cross lines. Electronic simulation circuitry is provided for producing a signal corresponding to the fundamental frequency component of a simulated capacitor voltage. A transient comparator circuit compares the fundamental frequency component of the simulated capacitor voltage with the fundamental frequency component of a measured capacitor voltage. Only rapid changes between the simulated capacitor voltage and the measured capacitor voltage are signaled as indicative of failures of one or more sectional capacitors in the capacitor battery. Slowly occurring voltage changes, which may correspond to variations in ambient temperature, do not lead to fault signaling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.