Method and device for judging fusing phase in three-phase three-column type distribution transformer

A distribution transformer, three-phase three-column technology, applied in the field of power system, can solve the problems of rising transformer accident rate, affecting power metering and grid loss, etc.

Inactive Publication Date: 2020-02-14
云南电力技术有限责任公司
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Problems solved by technology

Therefore, after a certain phase of the three-phase three-column distribution transformer is fused, the distribution transformer will run without a phase, which will seriously affect the power metering and power grid loss, and will easily lead to the problem of an increase in the accident rate of the transformer itself

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  • Method and device for judging fusing phase in three-phase three-column type distribution transformer
  • Method and device for judging fusing phase in three-phase three-column type distribution transformer
  • Method and device for judging fusing phase in three-phase three-column type distribution transformer

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Embodiment Construction

[0038] In order to make the purpose, technical solutions and advantages of the application clearer, the following will further describe the implementation of the application in detail in conjunction with the accompanying drawings.

[0039] The distribution transformer in the embodiment of this application is a Dyn11 type transformer, and 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 most projects of power system transformation, transformers of other connection types are gradually replaced by Dyn11 transformers. Therefore, it is meaningful to study the output cha...

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Abstract

The invention provides a method and a device for judging a fusing phase in a three-phase three-column type distribution transformer. The method comprises the following steps: a voltage monitoring terminal monitors low-voltage side voltage values of a power grid system in a plurality of time periods, determines voltage amplitude change information corresponding to a phase A, a phase B and a phase Cin the plurality of time periods, and further determines a phase corresponding to a voltage value with the minimum absolute value in the phase A, the phase B and the phase C; and further, according to the phase corresponding to the voltage value with the minimum absolute value in the phase A, the phase B and the phase C in the plurality of time periods, the fusing phase of the distribution transformer in the power grid system can be determined. By adopting the method for judging the fusing phase in the three-phase three-column type distribution transformer provided by the embodiment of the invention, the fusing phase of the three-phase three-column type distribution transformer can be simply, conveniently, quickly and effectively judged, so that electrical operation personnel can quicklyjudge accident reasons, power transmission can be quickly recovered, and the influence on a power distribution network system is reduced.

Description

technical field [0001] This application relates to the technical field of electric power systems, in particular to a method and device for judging a fuse phase in a three-phase three-column distribution transformer. Background technique [0002] With the continuous development of the economy and society, the electricity demand of my country's electricity customers is also increasing rapidly, and the load of my country's power system is facing many challenges and tests. The lack of phase operation of 10kV distribution lines in the distribution network system is one of the more common problems. In the process of power grid operation and maintenance, factors such as disconnection accidents on high-voltage lines, high-voltage fuses of distribution transformers blown, and three-phase contacts of load switches are not closed at the same time will cause the high-voltage side of the 10kV distribution transformer to run without phase, resulting in the loss of power on the line. Nega...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R29/16
CPCG01R29/16
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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