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Method and device for judging overvoltage reasons of low-voltage transformer area

A low-voltage platform area and overvoltage technology, applied in the direction of measuring devices, measuring current/voltage, measuring electrical variables, etc., can solve the problems of lack of research on discrimination and impact assessment, and achieve the effect of facilitating research

Active Publication Date: 2021-03-02
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Existing technologies related to overvoltage problems are mainly aimed at overvoltage protection, overvoltage identification, and overvoltage monitoring. There is still a lack of research on the identification and impact assessment of overvoltage problems in low-voltage stations caused by certain factors.

Method used

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  • Method and device for judging overvoltage reasons of low-voltage transformer area
  • Method and device for judging overvoltage reasons of low-voltage transformer area
  • Method and device for judging overvoltage reasons of low-voltage transformer area

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Embodiment Construction

[0032] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present application, and to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and understandable, the technical solutions in the embodiments of the present application are described below in conjunction with the accompanying drawings The program is described in further detail. Apparently, the described exemplary embodiments are only a part of the embodiments of the present application, rather than all the embodiments.

[0033] refer to figure 1 , figure 1 For this application, a flow chart of a method for judging the cause of overvoltage in a low-voltage station area is shown with specific steps:

[0034] S1: Read a hexagonal diagram data every preset time interval from the initial moment, the hexagonal diagram data includes: three-phase voltage and three-phase current;

[0035] In a fea...

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Abstract

The invention discloses a method and a device for judging overvoltage reasons of a low-voltage transformer area. The method comprises the following steps of: reading hexagonal diagram data every preset time interval from a starting moment; screening the three-phase voltage and the three-phase current at the overvoltage moment; acquiring amplitudes of three-phase line voltages without background factors; judging whether the amplitudes of the three-phase line voltages are equal in a deviation range or not so as to judge whether system-side overvoltage is included in causes of overvoltage or not;and further judging the overvoltage reason caused by the load side according to the three-phase imbalance state index and the grounding resistance state index, and introducing a utility function to evaluate the influence degree. The method and the device for judging the overvoltage reason of the low-voltage transformer area can effectively determine which factor causes the overvoltage problem ofa 380V three-phase four-wire system power distribution network, can evaluate the influence degree of the factor on the overvoltage problem, and are convenient for the research of the overvoltage problem of the power distribution network.

Description

technical field [0001] The invention belongs to the technical field of overvoltage judgment, and in particular relates to a method and device for judging the cause of overvoltage in a low-voltage station area. Background technique [0002] The overvoltage problem in the power supply area of ​​the low-voltage distribution network is widespread, which seriously affects the normal operation of electrical equipment, reduces the life of the equipment, and may even cause personal injury in severe cases. Overvoltage in low-voltage station areas can be divided into three categories: single-phase overvoltage, two-phase overvoltage and three-phase overvoltage. Three-phase overvoltage is generally caused by system side overvoltage or improper transformer gear, but there are many reasons for single-phase overvoltage or two-phase overvoltage: system side overvoltage, three-phase unbalance, transformer neutral Point grounding resistance is too large, etc. [0003] Unbalanced reactive po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R19/02G01R19/04G01R27/20G01R27/08G01R29/16G06Q10/06
CPCG01R19/00G01R19/04G01R19/02G01R27/20G01R27/08G01R29/16G06Q10/0635
Inventor 郭成李文云张艳萍王加富段锐敏
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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