Method for monitoring a ground resistance of an electric installation
US11275102B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 2, 2021 |
| Grant date | Mar 15, 2022 |
| Priority date | — |
| Expiry date | Feb 2, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/54
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method is for monitoring a ground resistance of an electric installation which consists of an ungrounded stationary alternating-voltage power supply system having at least one active conductor and of a consumer connected to the stationary alternating-voltage power supply system via a supply line. For this method, the already available active conductors of the stationary alternating-voltage power supply system and the leakage capacity of the leakage capacitor installed in the consumer are used to complete a measuring-current circuit for monitoring the ground resistance, a measuring signal being capacitively coupled between the active conductor and ground via a coupling circuit. Measuring currents and measuring voltages are measured when the consumer is switched on and off, a complex-valued load-side impedance, which has the ground resistance to be monitored in its real part, being detected from these measurements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.