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Oil-immersed transformer overtemperature warning method under harmonic condition

An oil-immersed transformer and transformer technology, which is applied in the direction of instruments, measuring electric variables, measuring devices, etc., can solve the problem of affecting the accuracy of power quality control indicators, the rationality of the transformer affecting the economy, and the inability to intuitively present the change of the temperature rise time of the transformer The trend of the transformer, the inability to provide objective and accurate basis for the high temperature rise of the transformer, etc., achieve high application value and market promotion prospects, improve operating efficiency and economy, and achieve the effect of simple methods

Inactive Publication Date: 2016-06-22
STATE GRID CORP OF CHINA +2
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Problems solved by technology

[0003] At present, the temperature rise of the transformer is also analyzed from the heating principle of the transformer, but the influence of the harmonic distortion rate and load rate on the temperature rise of the transformer is not considered, and the quantitative analysis of the influencing factors and the law of the temperature rise of the transformer is insufficient. In order to ensure the accuracy of power quality control indicators and the rationality of analyzing the economic impact of harmonics on transformers, and basically did not realize the early warning mechanism and method of transformer temperature rise, it is impossible to intuitively show the trend of transformer temperature rise with time, and it is impossible to provide governance Provide objective and accurate basis for excessive temperature rise of transformers

Method used

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  • Oil-immersed transformer overtemperature warning method under harmonic condition
  • Oil-immersed transformer overtemperature warning method under harmonic condition
  • Oil-immersed transformer overtemperature warning method under harmonic condition

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Embodiment 1

[0063] Such as Figure 1-4 As shown, the invention of this example provides an oil-immersed transformer overtemperature warning method under harmonic conditions, and the method includes the following steps:

[0064] figure 1 is the decomposition model of the transformer loss; the loss of each part of the transformer is calculated as follows:

[0065] P TOTAL =P NL +P LL (1)

[0066] P LL =P+P EC +P OSL (2)

[0067] P EC = P EC - R Σ h = 1 h = h max ( I h I R ) 2 h ...

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Abstract

The present invention relates to an oil-immersed transformer overtemperature warning method under a harmonic condition. The method comprises a step of determining any harmonic current distribution and the transformer winding eddy current loss, transformer stray loss and transformer total load loss actual values of a same total current effective value, a step of determining the relation among a transformer load loss, a harmonic distortion rate and a load rate, a step of determining the relation among a transformer hottest point temperature rise, the harmonic distortion rate and the load rate, and a step of determining the threshold of a corresponding alert level. According to the method, through transforming the basic formula of the transformer harmonic loss, the relation among the harmonic loss, a harmonic current distortion rate and the load rate is obtained, thus according to the relation model between transformer temperature rise and loss, the temperature rise condition of a transformer after a certain time is derived, and the early warning of the transformer temperature rise is realized.

Description

Technical field: [0001] The invention relates to a transformer over-temperature early warning method, in particular to an oil-immersed transformer over-temperature early warning method under harmonic conditions. Background technique: [0002] With the increasingly widespread application of nonlinear loads in the power grid, harmonics exist in all links of power generation, transmission, distribution, and power consumption. For the transformer, the most important component of the power system, harmonics will cause additional losses in the transformer. Increased heat generation and high oil temperature will directly lead to aging of transformer insulation and shortened service life, causing direct and indirect economic losses to power companies. The power supply department urgently needs to carry out relevant calculations on the excessive temperature rise of transformers caused by harmonics, and carry out early warnings, so as to understand the current temperature rise status ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 温惠毛涛王同勋谈萌
Owner STATE GRID CORP OF CHINA
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