Unlock instant, AI-driven research and patent intelligence for your innovation.

Method and apparatus for detecting deterioration of the insulation state in a running 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: 2016-11-09
VIENNA UNIVERSITY OF TECHNOLOGY
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and apparatus for detecting deterioration of the insulation state in a running electric machine
  • Method and apparatus for detecting deterioration of the insulation state in a running electric machine
  • Method and apparatus for detecting deterioration of the insulation state in a running electric machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0059] 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.

[0060] figure 1 The device 1 shown in is used to monitor the motor (induction motor) 2 on-line, 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'.

[0061...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method and a device (1) for on-line detection of deterioration of the insulation state of an electrical machine (2). A stepped voltage is applied to the winding (3) of the electric machine (2) by means of a converter (41), and the current (i) induced in this way is captured by means of at least one sensor (6, 7, 8) and / or the The time derivative (di / dt) of the current (i) is used as the measurement signal, which is then oversampled at a frequency higher than the stable characteristic frequency. The signal obtained by said oversampling is then evaluated against the parameters of this stabilization process, such as the overshoot (Ah) and / or the natural frequency (1 / ΔT ) and / or decay constants.

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 an electrical machine. 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, ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/34G01R31/06G01R27/28G01R31/28G01R31/50
CPCG01R31/1227G01R31/34G01R31/343G01R31/52G01R31/50
Inventor 托马斯·沃尔班克
Owner VIENNA UNIVERSITY OF TECHNOLOGY