An oil-immersed distribution transformer overheat protection method

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. ...

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.

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