Method for evaluating load capacity of large-scale power transformer under extremely cold conditions

A technology for power transformers and load capacity, which is used in the measurement of electrical variables, instruments, and electricity. It can solve the problem of difficult heat dissipation of the transformer, and achieve the effects of reducing downtime, reducing labor costs, and improving maintenance efficiency.

Active Publication Date: 2018-04-20
EAST INNER MONGOLIA ELECTRIC POWER COMPANY +3
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Problems solved by technology

Under extremely cold conditions, the transformer oil is in a low temperature state, and oil with poor fluidity at lo

Method used

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  • Method for evaluating load capacity of large-scale power transformer under extremely cold conditions
  • Method for evaluating load capacity of large-scale power transformer under extremely cold conditions
  • Method for evaluating load capacity of large-scale power transformer under extremely cold conditions

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Embodiment 1

[0048] A method for evaluating the load capacity of a large power transformer under extremely cold conditions, comprising the following steps:

[0049] Step 1: Establish a calculation model for the hot spot coefficient H of the transformer winding:

[0050] H=Q×S (1)

[0051] Among them: Q is the increase of the average temperature gradient of the winding caused by the additional loss of the transformer, and S is the local temperature gradient change caused by abnormal liquid cooling in the transformer winding:

[0052]

[0053] In the formula:

[0054] h is the heat transfer coefficient of the insulating oil near the hot spot of the transformer winding;

[0055] λ is the thermal conductivity of transformer oil;

[0056] p is the surface heat dissipation coefficient;

[0057] c p is the specific heat capacity of the fluid;

[0058] l is the length of the solid surface;

[0059] μ is the dynamic viscosity of transformer oil under corresponding extreme cold conditions;...

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Abstract

The invention discloses a method for evaluating the load capacity of a large-scale power transformer under extremely cold conditions. The method includes the steps of calculating a winding hot-spot coefficient H of a transformer; estimating the hot-spot temperature of the transformer under extremely cold conditions; and establishing a transformer load capacity evaluation model by taking a currentload ratio of the transformer as an additional evaluation parameter; and evaluating the load margin and overload capacity of the transformer. The method of the invention reduces the downtime, improvesthe overhaul efficiency, and reduces the labor cost of enterprises.

Description

technical field [0001] The invention relates to a method for evaluating the load capacity of a large-scale power transformer, in particular to a method for evaluating the load capacity of a large-scale power transformer under extremely cold conditions, and belongs to the technical field of transformer operation and maintenance. Background technique [0002] For modern society, safe, reliable and convenient electricity has become a necessary component of social production and people's life. As an important power conversion equipment and connection device in a power system, a large power transformer has a safe and reliable operation in the system, which is related to the safety and reliability of the power grid operation. The continuous and reliable supply and transmission of electric power is an important influencing factor for maintaining social stability, improving the quality of life of the people, and accelerating the production and development of the whole society. [0...

Claims

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Application Information

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IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 罗汉武叶立刚王东升张烈王海龙徐新尧崔士刚曹旭王永强
Owner EAST INNER MONGOLIA ELECTRIC POWER COMPANY
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