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Capacitor voltage transformer with harmonic measurement function

A technology of voltage transformer and capacitor voltage divider, which is applied in the direction of voltage divider, spectrum analysis/Fourier analysis, etc., and can solve problems such as power grid harmonic signal measurement

Pending Publication Date: 2020-03-24
CHINA ELECTRIC POWER RES INST +3
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention proposes a capacitive voltage transformer with harmonic measurement function to solve the problem of how to measure the harmonic signal of the power grid through the capacitive voltage transformer

Method used

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  • Capacitor voltage transformer with harmonic measurement function
  • Capacitor voltage transformer with harmonic measurement function
  • Capacitor voltage transformer with harmonic measurement function

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Embodiment approach

[0070] Figure 5 It is a schematic structural diagram of a capacitive voltage transformer body with a harmonic measurement function according to an embodiment of the present invention. like Figure 5 As shown, the embodiment of the present invention adds a harmonic measurement function on the basis of the existing CVT, and can be installed in AIS stations or HGIS stations with prominent harmonic problems to measure bus voltage and line voltage to realize real-time monitoring of grid voltage. Its main structure includes: capacitive voltage divider, electromagnetic unit and harmonic measurement module. The capacitive voltage divider is stacked on the oil tank of the electromagnetic unit, and the harmonic measurement module is connected to the electromagnetic unit through a shielded cable.

[0071] The capacitor voltage divider includes: upper flange 2, expander 3, outer insulating sleeve 4, high voltage capacitor 5, medium voltage capacitor 6, harmonic measuring capacitor 7, l...

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Abstract

The invention discloses a capacitive voltage transformer with a harmonic measurement function, which comprises a capacitive voltage divider, an electromagnetic unit and a harmonic measurement module,and is characterized in that the capacitive voltage divider comprises an outer insulating sleeve, a capacitor unit arranged in the outer insulating sleeve and an expander connected with one end of thecapacitor unit; the capacitor unit comprises a high-voltage capacitor, a medium-voltage capacitor and a harmonic measurement capacitor which are sequentially connected in series, a medium-voltage terminal between the high-voltage capacitor and the medium-voltage capacitor is connected with the high-voltage side of the electromagnetic unit, and a harmonic measurement terminal between the medium-voltage capacitor and the harmonic measurement capacitor is connected with the low-voltage side of the electromagnetic unit; and the harmonic measurement module is used for measuring the output voltageat the two ends of the harmonic measurement capacitor. On the basis of meeting the measurement accuracy of the power frequency signal, the capacitive voltage transformer also has the function of measuring the harmonic signal, only a small number of capacitor elements need to added in the structure of the existing CVT, the capacitive voltage transformer has the advantages of simple structure, smallinfluence on the service life of the product, good economy and the like, and can be popularized and applied to different voltage classes.

Description

technical field [0001] The present invention relates to the field of high-voltage insulation equipment, and more particularly, to a capacitive voltage transformer with a harmonic measurement function. Background technique [0002] The monitoring and management of harmonics need accurate harmonic measurement data as the premise and foundation, and the harmonic information is obtained by measuring and analyzing the secondary output signal of the power transformer using equipment such as power analyzer and power quality monitoring terminal. , which requires the power transformer to be able to correctly transmit harmonics to achieve accurate measurement of harmonics. At present, major power grid companies have basically built power grid harmonic monitoring modules, and one of the main sources of their data is capacitor voltage transformers (CVT). Conventional CVT is mainly composed of capacitive voltage divider and electromagnetic unit. Its body structure and parameters are des...

Claims

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Application Information

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IPC IPC(8): G01R23/16G01R15/06
CPCG01R23/16G01R15/06Y02E40/40
Inventor 王玲冯宇杨柳代双寅金焱陈栋新吴士普杜砚
Owner CHINA ELECTRIC POWER RES INST
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