Electrical network insulation monitoring and measuring device
US4896115A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1988 |
| Grant date | Jan 23, 1990 |
| Priority date | — |
| Expiry date | Jun 1, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/337
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An insulation monitoring device comprises an input circuit of a reference AC signal, and an electronic detection circuit for discriminating the components of a measurement signal proportional to the ground fault impedance Z formed by a leakage resistor Rf in parallel with a leakage capacitor C. A synchronous detector has a pair of static inverters processing the first component, which is a function of the current IR flowing through the leakage resistor Rf, and of the second component which is a function of the current IC flowing through the capacitor C. A converter cooperates with the generator to deliver two quadrature signals C1 and C2 to respectively control the inverters. A display means accurately displays the value of the leakage resistance Rf.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.