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Internal contact type capacitive voltage divider for GIS

A capacitive voltage divider and internal contact technology, applied in the field of power systems, can solve the problems of narrow measurement frequency band, poor low-frequency response of capacitive voltage divider, distorted electric field, etc., and achieve simple and compact structure, wide measurement frequency bandwidth and high measurement accuracy Effect

Active Publication Date: 2019-01-01
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the extremely high insulation design requirements inside the GIS, in order to ensure reliable insulation, the voltage divider usually uses a non-contact capacitive voltage divider, that is, the distributed capacitance between the GIS bus and the voltage divider shell is used as the high-voltage arm, but the dynamics of the distributed capacitance Unstable characteristics, so the measurement frequency band is narrow, which is not conducive to the measurement of various types of voltage
[0004] The contact capacitive voltage divider has the advantage of stable dynamic characteristics, but it will distort the electric field inside the GIS, which will reduce the insulation strength of the GIS, and the low frequency response of the capacitive voltage divider is poor

Method used

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  • Internal contact type capacitive voltage divider for GIS
  • Internal contact type capacitive voltage divider for GIS
  • Internal contact type capacitive voltage divider for GIS

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Embodiment Construction

[0059]The technical solutions in the embodiments of the present application are clearly and completely described below in conjunction with the accompanying drawings in the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

[0060] In the following description, a lot of specific details are set forth in order to fully understand the application, but the application can also be implemented in other ways that are different from the description again, and those skilled in the art can do similar without violating the connotation of the application Generalization, therefore, this application is not limited by the specific examples disclosed below.

[0061] see Figure 1 to Figure 4 ...

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Abstract

The invention discloses an internal contact type capacitive voltage divider for GIS, and the voltage divider comprises a high-voltage arm assembly, a metal connecting assembly, and a low-voltage arm assembly. The high-voltage arm assembly and the low-voltage arm assembly are connected through the metal connecting assembly. The high-voltage arm assembly comprises a support column insulator housingand a high-voltage capacitor unit, and the support column insulator housing can meet the insulating requirements of the GIS. The shape of the support column insulator housing is matched with a supportcolumn insulator. A metal insert of the high-voltage capacitor unit is provided with a projection, thereby effectively reducing the synthesized field intensity of a high-voltage side surface of the insulating housing. The low-voltage arm assembly comprises a metal low-voltage arm housing and a low-voltage arm unit, and the low-voltage arm unit comprises an impedance transformer. The impedance transformer enlarges the low frequency limit of the capacitor voltage divider, and can measure various voltage modes: lightning impulse, operation impact, and power frequency voltage. The voltage dividerprovided by the invention is precise in structure, is high in measurement precision, is good in stability, and is wide in measurement frequency band.

Description

technical field [0001] The present application relates to the field of power systems, in particular to an internal contact capacitive voltage divider for GIS. Background technique [0002] GIS (gas-insulated metal-enclosed switchgear) is widely used in power systems, but it is vulnerable to various overvoltage threats, such as lightning overvoltage, operating overvoltage, etc., so it needs to carry out corresponding factory tests and field tests. Some voltage generators use the docking method (the docking method is divided into non-contact and contact) to conduct routine experiments on GIS, so it is necessary to use the built-in voltage divider of GIS to measure the amplitude waveform of the applied voltage, etc. [0003] Due to the extremely high insulation design requirements inside the GIS, in order to ensure reliable insulation, the voltage divider usually uses a non-contact capacitive voltage divider, that is, the distributed capacitance between the GIS bus and the volt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R15/06
CPCG01R15/06
Inventor 谭向宇周年荣张林山王科马仪何顺彭晶何潇黄星马宏明徐肖伟程志万彭兆裕文韬
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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