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Method for ascertaining a short-circuit in a stator core

A stator core and lamination technology, which is used in motor generator testing, measuring devices, instruments, etc., can solve problems such as lamination identification that does not allow short circuits

Inactive Publication Date: 2013-06-12
ALSTOM TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] This traditional method allows shorted areas to be detected, but does not allow shorted laminations to be identified and the required countermeasures to be applied only where required
[0008] Furthermore, in the case of small shorts (i.e., when only two or a few laminations are shorted), the method will not fully detect the short

Method used

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  • Method for ascertaining a short-circuit in a stator core
  • Method for ascertaining a short-circuit in a stator core
  • Method for ascertaining a short-circuit in a stator core

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Embodiment Construction

[0016] This method is preferably carried out during manufacture, when the stator does not house the rotor and usually has a test wind rather than a final wind on the stator. There is no hassle in using the test winding due to the reduced supply current to the test winding and the magnetic flux through the stator during the test.

[0017] In addition, the method can also be used during maintenance of the electric machine.

[0018] Usually the part of the stator core that is more susceptible to short circuits between the laminations is the stator bore; for example a short circuit will be caused by a tool falling into the stator bore during manufacturing or maintenance and damage to the insulation. For this purpose, the method is preferably carried out in the stator bore.

[0019] figure 1 A stator core 1 is shown which typically has an annular structure defining a stator bore 2 . In the stator hole 2, a rotor is inserted; the rotor is not shown because it is not usually provi...

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Abstract

A Method for ascertaining a short-circuit in a stator core. The stator cores (1) have a plurality of laminations (3) insulated from one another. The method for ascertain a short circuit in the stator core (1) includes measuring the voltage of the laminations (3), determining the presence of a short circuit on the basis of the measured voltage.

Description

technical field [0001] The present disclosure relates to a method for determining a short circuit in a stator core. Background technique [0002] A rotating electrical machine has a stator core with a bore that accommodates a rotor. [0003] The stator core generally has a laminated structure comprising metal laminations with insulating material interposed between adjacent laminations. This structure prevents eddy currents from circulating through the stator core during operation. [0004] When insulation fails and two or more laminations are shorted, eddy currents may circulate; these eddy currents may create hot spots that can melt the laminations. [0005] For this reason, short circuits must be detected in order to eliminate them. [0006] To detect short circuits between laminations, it is known to operate the stator core at low flux (a few percent of the nominal flux) so that eddy currents circulate between the shorted laminations (this is usually achieved with auxi...

Claims

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Application Information

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IPC IPC(8): G01R31/02
CPCG01R31/34
Inventor H·格拉夫
Owner ALSTOM TECH LTD