Insulation fault location systems and methods for insulation fault location for a redundant DC power supply system coupled to diodes

US10649037B2 · kind B2 · utility

Assignee

• Bender GmbH & Co. KG · DE

Inventors

• Dieter Hackl · Albach, DE
• Carsten Hartmann · Hirschberg, DE

Key dates

• Filing date: Mar 30, 2018
• Grant date: May 12, 2020
• Expiry date: Oct 12, 2038

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02J1/06
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The invention relates to insulation fault location systems and methods for insulation fault location for an ungrounded DC power supply system, which is redundantly fed from a first direct voltage supply source coupled to diodes and a second direct voltage supply source coupled to diodes and to which a consumer is redundantly coupled. Due to the diode coupling and the asymmetric current splitting of the load current associated therewith, non-compensational partial currents arise in the supply lines in such a power supply system and consequently differential current portions, which can be captured by measuring current transformers and which can interfere with a valid test current during an insulation fault location. In order to eliminate the interfering differential current portions, compensating measures on the primary side are proposed in the measuring current transformers and indirect compensating measures on the secondary side are proposed in an insulation fault location apparatus.