System and method for locating insulation faults in redundant dc power supply systems connected with diodes

Abstract

The present invention relates to an insulation fault location system and method for insulation fault location of an ungrounded DC supply system powered from a first direct voltage supply source connected to a diode and a second direct voltage connected to the diode The power supply is fed redundantly and the consumers are redundantly coupled to the ungrounded DC power supply system. Due to the asymmetrical current splitting of the diode connections and the load currents associated with them, non-compensating partial currents are generated in the supply lines in such power supply systems and thus can be captured by measuring current transformers and can be detected during insulation fault location Interfering with the differential current portion of the effective test current. In order to eliminate interfering differential current components, compensation measures are proposed on the primary side in the measuring current transformer and indirect compensation measures on the secondary side in the insulation fault location device.

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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