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Method, circuit arrangement and insulation monitoring device for interference-resistant insulation monitoring

A technology for insulation monitoring and circuit devices, applied in circuit devices, emergency protection circuit devices, measuring devices, etc., can solve problems that cannot fully meet the needs of measurement and shutdown time

Active Publication Date: 2020-11-17
BENDER SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] However, the use of differential current based protective devices in unearthed supply systems is often problematic because this type of protective device only works when it is ensured that the differential current transformers of the fault current protective device are actually in the fault loop work reliably
[0021] The need for short measurement and switch-off times provided in specific applications cannot be fully met according to the prior art

Method used

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  • Method, circuit arrangement and insulation monitoring device for interference-resistant insulation monitoring
  • Method, circuit arrangement and insulation monitoring device for interference-resistant insulation monitoring

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Embodiment Construction

[0070] In the functional block diagram, figure 1 A first circuit arrangement according to the invention is shown for interference-resistant insulation monitoring of an ungrounded power supply system 2 with a converter 4 . The inverter 4 controls the electric motor 5 and together with it forms an inverter drive 6 .

[0071] The circuit arrangement according to the invention is based on the evaluation of the switching-frequent signal portion in order to connect the converter drive 6 to the power supply system in the event of an insulation fault Rfu, for example a ground fault at the electric motor 5 (drive unit) switched downstream of the converter 4 2 separation.

[0072] In this case, the ungrounded power supply system 2 is configured to have three phases, and is characterized by leakage resistance (insulation resistance) Rf and leakage capacitance Ce.

[0073] The circuit arrangement according to the invention has a coupling device 8 which is preferably arranged in an insul...

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Abstract

The invention relates to a method, a circuit arrangement and an insulation monitoring device for anti-interference insulation monitoring of an ungrounded power supply system with a converter. Independently of the detection of the measurement signal, the switching disturbance signal caused by the operating converter is detected and evaluated in the measured displacement voltage in order to derive a switching (turn-off) signal if necessary. Complementary to this, the interference resistance with respect to the low-frequency interference components generated by the converter is obtained by generating these low-frequency interference components from a replica of the pulse-width modulated signal of the converter and suppressing these low-frequency interference components sufficiently via subtraction such that the insulating Gapless (frequency) monitoring of resistance becomes possible.

Description

technical field [0001] The invention relates to a method and a circuit arrangement for interference-resistant insulation monitoring of an ungrounded power supply system with a converter (frequency converter). [0002] Furthermore, the invention relates to an insulation monitoring device with the proposed circuit arrangement. Background technique [0003] In order to provide electrical means of operation, a network configuration of an unearthed (IT) power supply system (French: Isolé Terre) is used for higher requirements on operational, fire and contact safety. In this type of supply system, all active components of the supply network configuration are separated from ground potential. [0004] Via the inherent safety of the unearthed supply system with respect to hazardous touch voltages, it is possible to maintain continuous power supply to consumers connected to the unearthed supply system even in the event of a first insulation fault. [0005] Therefore, the resistance ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/02
CPCG01R27/025G01R27/18H02H3/17H02H3/165H02H7/1216G01R31/1272
Inventor 迪特尔·黑克尔
Owner BENDER SA