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Method for drying transformer which has multistage cooling system, and cooling device controller for transformer of this kind

A cooling system, control device technology, applied in the field of transformers, can solve the problem of treatment duration of more than one year, long treatment duration, etc.

Pending Publication Date: 2021-11-26
SIEMENS ENERGY GLOBAL GMBH CO & KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage here is the extremely long treatment duration in practice, especially for solid insulation, which can even exceed one year
This can lead to further disadvantages, namely, when evaluating transformers, due to (depending on the drying method, especially in the suction method with vacuum) not only dissolved moisture but also other dissolved moisture are removed from the insulating liquid. components such as fault gases

Method used

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  • Method for drying transformer which has multistage cooling system, and cooling device controller for transformer of this kind

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Experimental program
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Effect test

Embodiment approach

60-70 >65 Drying mode: >60°C

[0072] Two cases are shown in Table B, namely, one for the case of load current 70% of rated current. Here, efficient drying is carried out at 60° C. or higher, respectively.

[0073] It should be noted that no structural modification at Transformer 1 is required for the choice of medium cooling class ODAN instead of ONAF, as can be seen from Table B. The corresponding type of cooling is easily set via the cooler control 8 .

[0074] In contrast to conventional cooling according to Table A, in the embodiment of the method according to the invention described in Table B, in particular in the load state range belonging to the highest cooling stage according to Table A, a second cooling stage is used. Correspondingly, the temperatures occurring during operation of the second cooling stage in table B are significantly higher than those occurring in operation of the second cooling stage in table A, which enables efficient drying du...

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Abstract

A method for drying a transformer (1) which has a multistage cooling system, in particular a power transformer or a choke, comprising at least one transformer winding (3) and at least one insulating means (7) for electrical insulation, wherein the cooling stages comprise a lowest cooling stage and a highest cooling stage, wherein the individual cooling stages are each associated with a loading state range of the transformer (1) and are activated when the respective loading state range of the transformer (1) is reached, wherein the loading state range is a function which depends at least on a temperature of the transformer (1), and wherein the drying method is carried out during operation of the transformer (1). It is proposed that an upper cooling stage, which lies above the lowest cooling stage, is or remains deactivated and the cooling stage which is situated directly below the upper cooling stage is or remains activated while the transformer (1) is in the loading state range which is associated with the upper cooling stage.

Description

technical field [0001] The invention relates to a method for drying transformers, in particular power transformers or choke coils, with a multi-stage cooling system, which has at least one transformer winding and at least one insulation device for electrical insulation, wherein the cooling stage includes the lowest cooling stage and the highest cooling stage, wherein each cooling stage is associated with a load state range of the transformer respectively and is activated upon reaching the corresponding load state range of the transformer, wherein the load state range is a function of at least the temperature of the transformer, and wherein in The method for drying is performed during operation of the transformer. [0002] Furthermore, the invention relates to a cooler control device for a transformer with a multi-stage cooling system, in particular a power transformer or an inductor, which has at least one transformer winding and at least one insulating device for electrical i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F27/14H01F27/40H05K7/20
CPCH01F27/14H01F27/402H01F27/025H01F27/32
Inventor M.斯卡拉
Owner SIEMENS ENERGY GLOBAL GMBH CO & KG