Electric measuring assembly and a method for continuously monitoring a protective-conductor resistance
US11500032B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 9, 2021 |
| Grant date | Nov 15, 2022 |
| Priority date | — |
| Expiry date | Sep 9, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/52
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electric measuring assembly and a method for continuously monitoring a protective-conductor resistance of a protective-conductor connection in a power supply system having a supply station, a supply line, and an electric installation, grounded via the connection. A signal generator generates a signal alternating voltage having a measuring frequency; a first transformer encircles the connection and a first winding inductively couples the voltage into the connection so a loop current flows via first and second leakage capacitors, the active conductors, and the connection, and a second winding for the second measurement of a protective-conductor voltage; a second transformer encircles the connection and has a secondary winding capturing a protective-conductor current flowing in the connection; an evaluation unit determines a loop impedance from the protective-conductor voltage and the protective-conductor current for evaluating the real part of the loop impedance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.