A transformer temporary zero-sequence overcurrent protection engineering setting method and system

A zero-sequence overcurrent, engineering setting technology, applied in the protection of overcurrent response, emergency protection circuit devices, electrical components, etc., can solve the problem of lack of temporary protection function, reduce the risk of safe and stable operation Easy to operate, strong applicability effect

Active Publication Date: 2022-05-13
CHINA SOUTHERN POWER GRID COMPANY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, further studies have found that the setting of transformer zero-sequence overcurrent protection in the prior art generally only cooperates with section I or section II or backup section of zero-sequence overcurrent protection of adjacent lines, and does not have a complete temporary protection function

Method used

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  • A transformer temporary zero-sequence overcurrent protection engineering setting method and system
  • A transformer temporary zero-sequence overcurrent protection engineering setting method and system
  • A transformer temporary zero-sequence overcurrent protection engineering setting method and system

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Embodiment Construction

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0030] figure 2 It is a schematic diagram of an application scenario for exemplary explanation of the tuning process according to the present invention.

[0031] First, if figure 2 As shown in , according to the present invention, the #2 transformer to be started can be switched on for the first time without load, and the wave recording c...

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Abstract

The invention belongs to the field of safe operation protection of a power grid system, and discloses a temporary zero-sequence overcurrent protection engineering setting method for a transformer, which includes: firstly closing the transformer to be started, and measuring the flow through the high-voltage side of the transformer and the adjacent The three-phase current of the component; calculate the zero-mode inrush current and the RMS value of the zero-sequence current flowing through the high-voltage side of the transformer and adjacent components; find the corresponding peak value of the zero-sequence current RMS, and calculate the ratio of the two as the proportional coefficient; based on the The proportional coefficient is calculated to obtain the action threshold value and related action delay that can realize temporary zero-sequence protection when the transformer is started and put into operation. The invention also discloses a corresponding tuning system, a computer-readable storage medium and a terminal. The invention can effectively solve the problem of misoperation of the zero-sequence overcurrent protection of adjacent components when the transformer is air-dropped without acquiring any electrical parameters of the transformer and adjacent components, and at the same time has the advantages of simplicity, reliability, easy operation and strong applicability Features.

Description

technical field [0001] The invention belongs to the field related to safe operation and protection of power grid systems, and more specifically relates to a method and system for engineering setting of temporary zero-sequence overcurrent protection of transformers. Background technique [0002] In recent years, various types of high-short-circuit impedance transformers have been widely used, and the zero-sequence overcurrent protection of adjacent components (such as lines) has been misoperated many times when the transformers are put into operation, which poses a serious threat to the safe operation of the system. In engineering practice, the zero-sequence overcurrent protection of the line is usually implemented in accordance with the principle of ensuring sufficient sensitivity to the ground fault at the end of the line and ensuring sufficient sensitivity when the fault passes through the maximum transition resistance. When the transformer is put into operation, a three-p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/04H02H3/08
CPCH02H7/04H02H3/08
Inventor 丁晓兵张弛陈朝晖张静伟余江吴江雄郑茂然
Owner CHINA SOUTHERN POWER GRID COMPANY
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