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Insulation fault location method and system for an ungrounded power supply system

A technology for insulation faults and power supply systems. It is applied to fault locations, fault detection according to conductor types, and electrical measurement. It can solve problems such as high cost and time overhead, the maximum acceptable test current is not allowed to be exceeded, and the location of faults cannot be ensured.

Active Publication Date: 2021-04-20
BENDER SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Especially together with high-impedance insulation faults in faulty circuits and the resulting amperages, it is not always possible to ensure safe capture and evaluation of test currents and thus reliable location of faults
[0014] Currently, these problems can only be solved by not allowing the maximum acceptable test current to be exceeded or by continuously switching off the installed parts, which comes with high cost and time overhead

Method used

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  • Insulation fault location method and system for an ungrounded power supply system
  • Insulation fault location method and system for an ungrounded power supply system
  • Insulation fault location method and system for an ungrounded power supply system

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Embodiment Construction

[0056] exist figure 1 In , an unearthed power supply system 2 with an insulation monitoring device 10 is shown in a schematically simplified view. The ungrounded power supply system 2 has two active conductors L1 , L2 and is fed by a DC source 4 . In general, the method for insulation fault location and the insulation fault location device 10 implementing the method according to the present invention can be used in any arbitrary single-phase or multi-phase DC or AC network.

[0057] Consumers 6 connected to ground potential (earth) via a ground connection are connected to the ungrounded power supply system 2 . The active parts of the ungrounded power supply system 2 have no ground connection, so that ideally, when a first fault occurs (at figure 1 Shown by the insulation fault resistance RF in ), no closed fault circuit will be formed (except for the leakage current via the network leakage resistance RL, CL).

[0058] The overall insulation resistance Riso ( image 3 ). I...

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Abstract

The invention relates to an insulation fault location method and an insulation fault location system for an ungrounded power supply system. The main idea of ​​the invention is based on the idea of ​​adaptively setting the test current pulse duration of the test current, while maintaining a predetermined maximum permissible test current amplitude, such that all disturbing values, in particular Leakage current due to large power supply leakage capacitance. If a test of the value of the final value of the differential current shows that the test current threshold has been exceeded, this exceeding can be taken as an indication that the corresponding conductor part is thus in a faulty circuit.

Description

technical field [0001] The invention relates to an insulation fault location method and an insulation fault location system for an ungrounded power supply system. Background technique [0002] For higher requirements on operational, fire and contact safety, network configurations of unearthed supply systems are used, which are also known as isolated networks (French: Isolé Terre-IT) or IT supply systems. In this power supply system, the active components are separated from the ground potential with respect to "earth". The advantage of these networks lies in the fact that the functionality of the connected electrical users is not affected by insulation faults (first faults) such as ground faults or physical contact, since ideally (neglecting power supply leakage capacitance in this case) A closed circuit cannot be formed between an active conductor and ground due to the infinite impedance value. [0003] Due to this inherent safety of the unearthed power supply system, in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08G01R31/14
CPCG01R31/086G01R31/14G01R27/18G01R31/08G01R31/52G01R31/083G01R31/1272
Inventor 奥利弗·舍费尔赫尔穆特·贝克尔卡斯滕·哈特曼
Owner BENDER SA