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Method and device for judging core column structure in distribution transformer

A technology for distribution transformers and core columns, which is applied in the field of power systems, can solve problems such as undiagnosed core column structures in distribution transformers, and achieve the effect of quickly troubleshooting and reducing impacts

Active Publication Date: 2022-02-01
云南电力技术有限责任公司
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  • Application Information

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Problems solved by technology

However, in the prior art, there is no method for effectively judging the structure of the iron core column in the distribution transformer.

Method used

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  • Method and device for judging core column structure in distribution transformer
  • Method and device for judging core column structure in distribution transformer
  • Method and device for judging core column structure in distribution transformer

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Embodiment Construction

[0055] In order to make the purpose, technical solution and advantages of the present application clearer, the implementation manners of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0056] The distribution transformer in the embodiment of the present application is a Dyn11 type transformer, the high voltage side of the Dyn11 type transformer adopts a delta connection mode, and the low voltage side adopts a star connection mode. Dyn11 type transformer is currently the most widely used type of transformer, which has many advantages, such as strong capacity with unbalanced load, high output voltage quality, can provide a path for zero-sequence current, but can prevent zero-sequence current from entering the high-voltage power grid, etc. . Therefore, in the transformation of most projects of the power system, transformers of other connection types are gradually replaced by Dyn11 transformers. Therefore, it is m...

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Abstract

The present application provides a method and device for judging the structure of an iron core column in a distribution transformer. The method includes: after the voltage monitoring terminal monitors the low-voltage side voltage value of the power grid system in the current time period, determines the voltage amplitude change information corresponding to the A-phase, B-phase and C-phase respectively, and then determines the distribution transformer in the power grid system. Fusing the phase; after the voltage monitoring terminal monitors the voltage value of the low-voltage side of the power grid system under zero-load state again, it determines the corresponding voltage amplitudes of A-phase, B-phase and C-phase under zero-load state, and then can determine the distribution in the power grid system. The structure of the core column in an electrical transformer. In this way, the structure of the core column can be judged simply and effectively by using the phase loss of the distribution transformer, so that the electrical operators can quickly judge whether the system structure is a three-phase three-column type or a three-phase five-column type, which in turn helps to quickly troubleshoot faults. , reduce the impact on the transformer of the distribution network system.

Description

technical field [0001] The present application relates to the technical field of power systems, and in particular to a method and device for judging the structure of a core column in a distribution transformer. Background technique [0002] In the current power system, distribution transformers with three-phase three-column structure and three-phase five-column structure have been widely used in power systems. The distribution transformer with three-phase three-column structure is that the three-phase windings are respectively wound on three iron core columns, and the three columns are connected up and down with iron yokes. The distribution transformer with three-phase five-column structure is that in addition to the three core columns of the above-mentioned three-phase winding, there are two free core columns without windings on both sides, and the upper and lower sides of the five core columns are connected by iron yokes. . [0003] Once the distribution transformer fail...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 谢学刚刘红文张春丽
Owner 云南电力技术有限责任公司
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