Oil-immersed distribution transformer overheating protection method

A distribution transformer and overheat protection technology, applied in the field of power transmission and distribution, can solve the problems of affecting the quality of power supply, low level of intelligence, misjudgment, etc., to improve the quality of power supply, realize the effect of intelligence and automation

Active Publication Date: 2018-08-07
GUANGDONG CHAMPON ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method only relies on the low-voltage load current of the distribution transformer to judge, and the judgment basis is too single, which is easy to cause misjudgment and affect the quality of power supply
At the same time, this method also has the problem of low intelligence.

Method used

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  • Oil-immersed distribution transformer overheating protection method
  • Oil-immersed distribution transformer overheating protection method
  • Oil-immersed distribution transformer overheating protection method

Examples

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Embodiment

[0032] Figure 1 to Figure 3 As shown, this embodiment provides an overheat protection method for an oil-immersed distribution transformer: the electronic intelligent low-voltage circuit breaker is embedded with an overheat protection system; the duration and the allowable value of the hot spot temperature of the winding are preset in the overheat protection system; The equivalent load current is obtained by integrating the distribution transformer load current value monitored within the duration, and the maximum hot spot temperature value of the winding is calculated according to the ambient temperature, equivalent load current and duration, and the maximum hot spot temperature value of the winding is compared with the preset value. The allowable value of the hot spot temperature of the winding is compared and judged to determine whether to perform a tripping action to automatically remove the distribution transformer from the grid, so as to realize the overheat protection of ...

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PUM

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Abstract

The invention provides an oil-immersed distribution transformer overheating protection method featured by comprising the following steps: embedding an overheating protection system in an electronic intelligent low voltage breaker; enabling the overheating protection system to integrate distribution transformer load current values obtained in a continuous monitoring time so as to obtain an equivalent load, calculating the winding maximum hot point temperature value according to an environment temperature, an equivalent load current and a continuous time, and determining whether to execute a release motion or not according to the winding maximum hot point temperature value and thus automatically cutting off the distribution transformer from the power grid; enabling the overheating protectionsystem to determine the monitored distribution transformer oil surface temperature size, thus determining whether to execute the release motion so as to automatically cut off the distribution transformer from the power grid or not, and carrying out overheating protection for the distribution transformer. The distribution transformer overheating protection method can reasonably, accurately and reliably automatically cut off the distribution transformer from the power grid under overheating conditions, thus intelligently and automatically protecting the distribution transformer.

Description

technical field [0001] The invention relates to the technical field of power transmission and distribution, and more specifically relates to an overheat protection method for an oil-immersed distribution transformer. Background technique [0002] During the operation of the distribution transformer, the heat generated by the load current will cause the internal temperature to rise. When the internal temperature exceeds the conditions allowed by the insulating material, that is, local overheating, it will cause insulation aging, which may damage the distribution transformer. Therefore, the overheat protection of distribution transformers is an important means to ensure the safe and reliable operation of distribution transformers. [0003] The application of low-voltage circuit breakers in the power distribution system to cut off the distribution transformers is an important and reliable method for the power system to realize self-protection and power supply quality control. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/04H02H5/04H01F27/40
CPCH01F27/402H01F2027/404H01F2027/406H02H5/04H02H7/04
Inventor 张俊忠黄书胡胡军
Owner GUANGDONG CHAMPON ELECTRIC CO LTD
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