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A substation cvt harmonic measurement and judgment device

A technology for judging devices and substations, applied in the field of electric power, can solve the problems of increasing the harmonic level of voltage levels of 110kV and above, and increasing the harmonic level of high-voltage AC systems. Effect

Active Publication Date: 2020-12-04
LONGYAN POWER SUPPLY COMPANY STATE GRID FUJIAN ELECTRIC POWER +1
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AI Technical Summary

Problems solved by technology

The development of DC transmission may lead to an increase in the harmonic level of the high-voltage AC system
On the other hand, with the development of power electronics technology, more nonlinear loads with larger capacity are directly connected to the power grid with a voltage level of 110kV and above, which greatly increases the harmonic level of the voltage level of 110kV and above

Method used

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  • A substation cvt harmonic measurement and judgment device
  • A substation cvt harmonic measurement and judgment device
  • A substation cvt harmonic measurement and judgment device

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Embodiment Construction

[0033] The present invention will be further described below through specific embodiments.

[0034] see Figure 1 to Figure 4 A substation CVT harmonic measurement and judgment device mainly includes: a capacitive voltage transformer (CVT) for directly measuring the grid voltage; a current transformer (CT) for measuring the grid current; Adjusted signal conditioning circuit; anti-aliasing filter to limit signal frequency; data acquisition card to convert analog signal into digital signal; analyze and process digital signal and judge whether the voltage signal detected by capacitive voltage transformer is real The DFT analysis module of the grid side harmonic voltage.

[0035] According to the safety, accuracy and immunity of the measuring instrument, the signal conditioning circuit is designed on the basis of the output signal characteristics of the transformer, which includes a first conditioning circuit and a second conditioning circuit, the first conditioning circuit and t...

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Abstract

The invention relates to a substation CVT harmonic measuring and judging device which is suitable for a no-load line of substations with voltage level of 35 kV and above. The device comprises a capacitive voltage transformer, a current transformer, a signal conditioning circuit, an anti-aliasing filter, a data acquisition card and a DFT analysis module. The device provided by the invention can quickly judge the accuracy of CVT harmonic measurement in the substation with the no-load line in the field, has the characteristics of portability, result visualization and the like, and provides a feasible solution device for CVT harmonic measurement of a high-voltage substation.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a substation CVT harmonic measurement and judgment device. Background technique [0002] In the power system, the measurement of voltage is essential. The earliest 110kV ~ 220kV level power plant step-up station and busbar of step-down substation usually use electromagnetic voltage transformer (TV) to measure voltage and power, but Electromagnetic voltage transformers have many defects, resulting in many accidents. Moreover, with the increase of the transmission voltage of the power system, the volume of the TV is getting larger and higher, and the cost is getting higher and higher. Therefore, it is necessary to seek other forms of voltage transformers to meet the growing requirements of the power system. In this context, capacitors Type voltage transformers are used in power systems. It is built on the basis of the original capacitor bushing voltage extraction device. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/16
Inventor 黄雁钟红红邹炜锋
Owner LONGYAN POWER SUPPLY COMPANY STATE GRID FUJIAN ELECTRIC POWER
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