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

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.

Description

technical field [0001] The present invention relates to an insulation fault location system and method for insulation fault location based on a corresponding preamble for an ungrounded DC power supply system, which is disclosed in the invention as an ungrounded DC power supply system being connected from a The first DC voltage supply of the diode and the second DC voltage supply connected to the diode are redundantly fed, and the consumer is fed via a first supply line consisting of two active conductors and consisting of two active conductors The second power supply line is redundantly connected to the ungrounded DC power supply system. Background technique [0002] To supply electrically operated devices, when the requirements for operational, fire and contact safety increase, grounding systems of unearthed supply systems are used, also known as isolated networks (French: Isolé Terre – IT) or IT supply system. In this type of power supply system, the active components ar...

AI Technical Summary

Problems solved by technology

[0025] It may be useful to separate the connection between the negative terminals of the two redundant DC voltage supplies, however, this is unacceptable in most installations as certain failure conditions to be observed would result in redundant DC voltage supplies The power supplies are switched in series and the line-to-line voltage due to this can cause insulation coordination problems in the facility

[0026] Therefore, fully automatic fault location cannot be achieved in this way in most application cases

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