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Method and device for shutting down an installation part exhibiting an insulation fault in an ungrounded power supply system

A power supply system, insulation fault technology, applied in circuit devices, emergency protection circuit devices, emergency protection devices with automatic disconnection, etc., can solve problems such as early failure and engine enlargement

Active Publication Date: 2016-11-23
BENDER SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with prolonged exposure of the drive system to insulation faults for periods of seconds or even minutes, increased stress and early failure of the engine can occur

Method used

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  • Method and device for shutting down an installation part exhibiting an insulation fault in an ungrounded power supply system
  • Method and device for shutting down an installation part exhibiting an insulation fault in an ungrounded power supply system
  • Method and device for shutting down an installation part exhibiting an insulation fault in an ungrounded power supply system

Examples

Experimental program
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Effect test

Embodiment Construction

[0043] Figure 1 shows an unearthed power supply system (IT power supply system) 2 consisting of a three-phase AC feed 3 with connected equipment, to which an installation part 6 is connected and which can be switched off and With a DC circuit 8 and a motor as load, the DC circuit 8 and the motor form a controlled drive system, as an example in this case.

[0044] A conventional insulation monitoring device 12 for determining the insulation resistance Riso of the entire IT power supply system 4 is arranged in the three-phase AC power supply 4 . An insulation fault Riso2 occurring in the DC circuit 8 causes a residual DC current which, according to the prior art, is registered in the residual current protective device 14 by means of a differential current measurement technique. In order to be able to detect potential disturbing effects on the load 10, the load 10 should be able to measure even a minimum residual direct current of magnitude 100 mA. Since the leakage current caus...

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PUM

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Abstract

The invention relates to a method and to a device for shutting down an installation part provided with connected equipment in an ungrounded power supply system in case of an insulation fault in a direct-current circuit connected to the installation part to be shut down. The invention is based on first determining the insulation resistance of the IT power supply system and measuring the displacement direct voltage present in the IT power supply system and then determining by combined evaluation of the measured results if there is a risk of an disruptive influence on the operating behavior of the connected equipment due to the displacement direct voltage occurring during the duration of a predeterminable time interval. If a disruptive influence is to be expected, the installation part exhibiting the insulation fault is immediately shut down together with the direct-current circuit and the equipment connected thereto.

Description

technical field [0001] The invention relates to a method and a device for shutting down an installation part of a device provided with a connection in an unearthed power supply system in case of an insulation fault in a direct current circuit connected to the installation part to be shut down. Background technique [0002] When supplying energy to electrical equipment, unearthed power supply systems of the network type (also called insulated network or IT power supply systems) are used if high requirements in terms of operability, fire and contact safety are to be met. In this type of power supply system, the active part is separated from ground potential, ie isolated from ground. The advantage of these networks is that the function of the electrical equipment is not affected in the event of a first insulation fault (e.g. a ground fault or a frame fault), since in the case of this first fault an ideally infinite impedance value prevents A closed circuit is formed between th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
CPCH02H3/165G01R27/025G01R31/12H02H3/16H02H7/26H02H7/268
Inventor 迪科尔·哈克尔奥利弗·沙佛
Owner BENDER SA