Estimation method for cooler efficiency of oil-immersed power transformer

A technology for power transformers and transformers, applied in the fields of transformer/inductor cooling, instruments, electrical digital data processing, etc., can solve problems such as insufficient efficiency of transformer coolers

Active Publication Date: 2015-02-18
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: aiming at the above-mentioned problems of the prior art, to provide a transformer capable of realizing cooler efficiency calculation to grasp the load capacity of the transformer to solve the prob...

Method used

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  • Estimation method for cooler efficiency of oil-immersed power transformer
  • Estimation method for cooler efficiency of oil-immersed power transformer
  • Estimation method for cooler efficiency of oil-immersed power transformer

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Embodiment Construction

[0032] like figure 1 As shown, the steps of the method for evaluating the efficiency of the oil-immersed power transformer cooler in this embodiment include:

[0033] 1) Calculate the average load loss of the transformer to be evaluated in the specified time period In this embodiment, the time period from time 0 to time r is used as the designated time period;

[0034] 2) The average load loss Add the nameplate no-load loss p of the transformer to be evaluated 0 , to get the average total loss power of the transformer to be evaluated in the specified time period (Right now );

[0035] 3) Calculate the average residual power of the transformer to be evaluated in the specified time period

[0036] 4) Assuming the cooler efficiency η of the transformer to be evaluated, calculate the average cooling power of the cooler of the transformer to be evaluated in a specified time period according to the assumed cooler efficiency η

[0037] 5) According to the average total...

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Abstract

The invention discloses an estimation method for cooler efficiency of an oil-immersed power transformer. The estimation method comprises the following steps: calculating average load loss of a to-be-estimated transformer in a specified period of time and adding nameplate no-load loss to the average load loss to obtain average total loss power; calculating average after-power of the to-be-estimated transformer in the specified period of time; supposing the cooler efficiency of the to-be-estimated transformer, calculating average cooling power of a cooler of the to-be-estimated transformer in the specified period of time, and subtracting the average after-power from the average total loss power and dividing by the average cooling power to reversely calculate the cooler efficiency of the to-be-estimated transformer according to the energy consumption balance relationship that the difference of the average total loss power and the average cooling power is equal to the average after-power. According to the estimation method, the calculation of the cooler efficiency can be realized to master the loading capacity of the transformer so as to solve the problem of insufficient cooler efficiency of the transformer; the estimation method adapts to the transformer provided with the cooler, and can also provide a basis for calculating the temperature rise of top oil of the transformer.

Description

technical field [0001] The invention relates to an efficiency optimization technology of an oil-immersed power transformer, in particular to an evaluation method for the efficiency of a cooler of an oil-immersed power transformer. Background technique [0002] The transformer manufacturer uses the factory calculation method to calculate the loss, oil temperature rise, and winding temperature rise of the oil-immersed power transformer. According to the calculation results, a cooling system with a certain capacity is configured to meet the cooling needs of the oil-immersed power transformer. However, after the oil-immersed power transformer in the power grid has been in operation for a period of time, due to the influence of pollution and dust, the efficiency of the cooling system will inevitably decrease. If it is not cleaned or repaired in time, the oil-immersed transformer may The temperature rise of the top oil of the type power transformer exceeds the allowable value, whi...

Claims

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Application Information

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IPC IPC(8): G06F19/00H01F27/08
Inventor 刘赟刘兴文叶会生万勋段建家
Owner STATE GRID CORP OF CHINA
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