Method and apparatus for determining core limb structure in distribution transformer

A technology for distribution transformers and iron core columns, which is applied in the field of power systems and can solve problems such as the inability to judge the structure of iron core columns in distribution transformers

Active Publication Date: 2019-12-31
云南电力技术有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the prior art, there is no method for effectively judging

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  • Method and apparatus for determining core limb structure in distribution transformer
  • Method and apparatus for determining core limb structure in distribution transformer
  • Method and apparatus for determining core limb 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 an apparatus for determining a core limb structure in a distribution transformer. The method comprises: after a voltage monitoring terminal monitors a low-voltage side voltage value of a power grid system within a current time period, determining voltage amplitude change information corresponding to a phase A, a phase B and a phase C, respectively, andthen determining a fused phase of a distribution transformer in the power grid system; and after the voltage monitoring terminal monitors the low-voltage side voltage value of the power grid system under a zero load state, determining voltage amplitudes corresponding to the phase A, the B phase, and the C phase respectively under the zero load state, and further determining an core limb structurein the distribution transformer of the power grid system. According to the method and apparatus provided by the present application, the default phase of the distribution transformer can be simply and effectively used to determine the core limb structure, and an electrical operator can quickly determine whether the system structure is a three-phase three-pillar type or a three-phase five-pillar type in a facilitated manner, so that troubleshooting is quickly performed in a facilitated manner, and the influence on the transformer of a distribution network system is reduced.

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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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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