Method and device for identifying and locating cyclic momentary insulation faults in an underground power supply system
US11867718B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 2022 |
| Grant date | Jan 9, 2024 |
| Priority date | — |
| Expiry date | Oct 25, 2042 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/33
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention relates to a method and a device for identifying and locating cyclic momentary insulation faults in an ungrounded power supply system, the method comprising the steps: detecting a fault current caused by the momentary insulation fault as a differential current in the branch circuit to be monitored and displaying the temporal progression of the differential current via a differential current signal by means of a differential current sensor; providing a processing signal which temporally describes a process sequence of a process taking place in the consumer; correlating the differential current signal with the processing signal in a computing unit in order to yield a correlation signal as a measure for a temporal match between the differential current signal and the processing signal; signaling the momentary insulation fault via the computing unit by means of a signaling signal if the correlation signal shows the temporal match. The device according to the invention has a differential current sensor and a computing unit so that it can implement the method according to the invention.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.