Method and device for detecting a deterioration in the state of an insulation in an operating electric machine

A technology of insulation state and deterioration, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve problems such as failure to find insulation defects

Active Publication Date: 2014-04-16
VIENNA UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the resulting insulation defects cannot be found by this method

Method used

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  • Method and device for detecting a deterioration in the state of an insulation in an operating electric machine
  • Method and device for detecting a deterioration in the state of an insulation in an operating electric machine
  • Method and device for detecting a deterioration in the state of an insulation in an operating electric machine

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Embodiment Construction

[0044] figure 1 A schematic diagram of a preferred embodiment of the device according to the invention for the on-line detection of deterioration of the insulation state in an electrical machine is shown, which preferred embodiment is particularly suitable for carrying out the method of the invention.

[0045] figure 1 The device 1 shown in is used for on-line monitoring of a motor (induction motor) 2, which can be a single-phase motor or a multi-phase motor, wherein, although in figure 1 Only a single winding 3 is shown schematically for a motor 2 in figure 1 , take for example three phases. The electric machine 2 has a power supply circuit or supply circuit 4 assigned to the electric machine 2 , which has three corresponding current supply lines 4A, 4B and 4C. The power supply circuit 4 also includes an inverter 4', which provides a corresponding voltage signal for the motor 2. In addition, the figure shows a DC terminal capacitance 5 associated with the inverter 4'.

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Abstract

The invention relates to a method and a device (1) for the online-detection of a deterioration in the state of an insulation in an electric machine (2). A stepped voltage is applied to the winding(s) (3) of the machine (2) with the aid of a converter (41), and the current (i) induced in this manner, and/or the time derivative (di/dt) thereof, is acquired as a measurement signal with the aid of at least one sensor (6, 7, 8) and is then oversampled with a frequency higher than the frequencies characteristic for settling. The signal obtained by said oversampling is then evaluated with regard to parameters of the settling process such as overshooting (Ah) and/or natural frequency (1/delta T) and/or a damping constant, in order to detect any deterioration in the insulation.

Description

technical field [0001] The invention relates to a method and a device for on-line detection of deterioration of the insulation state in or at a motor. Background technique [0002] Inverter-controlled motors are being used more and more in a very wide range of fields. In particular, such drive systems are used not only as a standard in industry, but also in traction systems, especially in safety-critical systems. In this regard, preventative monitoring of these systems against their conditions and maintaining these conditions is becoming increasingly important. A major cause of repeated failures of such motors is due to insulation degradation, especially on the stator windings. Studies have shown that about 30% to 40% of all faults are related to the stator, and among these stator-related faults, about 70% of the faults are caused by deterioration or failure in the winding insulation or the insulation to the ground. [0003] When operating with an inverter, the insulation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/34G01R31/06G01R27/28G01R31/28G01R31/50
CPCG01R31/343G01R31/1227G01R31/025G01R31/06G01R31/34G01R31/52G01R31/50
Inventor 托马斯·沃尔班克
Owner VIENNA UNIVERSITY OF TECHNOLOGY
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