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Method and device for detecting the degree of pollution in an operational converter

A pollution degree, converter technology, applied in output power conversion devices, emergency protection circuit devices that respond to undesired changes, and emergency protection devices that automatically disconnect, which can solve production interruptions, large follow-up costs, etc. problems, to achieve the effect of reducing cost and image loss, reducing the number of shutdowns, and improving the value of leakage current

Inactive Publication Date: 2007-04-04
SIEMENS AG
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

If such converter devices are connected in a production process, the entire production may be interrupted by a disconnected converter device, resulting in huge follow-up costs

Method used

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  • Method and device for detecting the degree of pollution in an operational converter
  • Method and device for detecting the degree of pollution in an operational converter
  • Method and device for detecting the degree of pollution in an operational converter

Examples

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Embodiment Construction

[0023] A preferred embodiment of the first device according to the invention is shown by way of example in FIG. 1 . The device has a temperature module 2 , a temperature sensor 4 and an evaluation circuit 6 . The temperature sensor 4 is placed on the part of the converter device whose temperature is to be measured. This component is the cooler of the converter device, which is in direct contact with the ambient air of the converter device. The temperature module 2 is a known temperature module for coolers. Use this temperature module according to the actual power loss P V and the actual cooling medium temperature T umg Determine the expected cooler temperature T KK . Here, the integral time constant corresponds to the thermal mass of the cooler, and the feedback coefficient corresponds to the cooler thermal resistance R th the reciprocal of . As in conventional thermal modules, to estimate the semiconductor barrier temperature, the power loss P is determined from the lo...

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Abstract

The invention relates to a method and a device for detecting the degree of pollution in an operational converter. According to the invention, the operating condition of at least one of the converter components that is exposed to the ambient air is determined and a corresponding operating condition of said component in an unpolluted state is determined. The two operating conditions are then compared and the calculated comparison value is used as a measurement for the degree of pollution of the converter. The inventive method for detecting the degree of pollution of an operational converter permits a reduction of the number of breakdowns as a result of a non-protected operating mode of a converter and of the associated disadvantages such as costs and damage to a company's image.

Description

technical field [0001] The invention relates to a method and a device for detecting the degree of contamination of an operating converter installation. Background technique [0002] If a converter device, such as a frequency converter, is operated in a polluted environment without a corresponding degree of protection, deposits can occur inside the converter device. Since the ambient air of the converter is used as cooling medium, contamination particles present in the ambient air can deposit on the surfaces of components of the converter device, in particular the elements to be cooled. Such deposits lead to overheating on the surface to be cooled (for example of a cooler) or on the surface of the wearable component, with subsequent damage. Deposits on insulating surfaces can bridge the electrical insulation and thus endanger the functionality and reliability of the converter device. [0003] Although commercially available converter devices are used in accordance with thei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F27/42H02M1/08H02H5/04H02H6/00
CPCH02H6/005H02H5/042
Inventor 休伯特·希尔林
Owner SIEMENS AG
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