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Method for testing broadband characteristic of CVT (capacitor voltage transformer) by high voltage harmonic

A technology of high-voltage harmonics and testing methods, applied in the field of electric power, can solve the problems of difficult operation, unable to reflect the transmission characteristics of transformers in the harmonic frequency band, destroying the internal components of capacitive voltage transformers CVT, etc., so as to improve power quality and suppress harmonics. The effect of wave interference

Inactive Publication Date: 2013-04-17
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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AI Technical Summary

Problems solved by technology

The scattering parameter test method based on the network analyzer cannot reflect the transmission characteristics of the harmonic frequency band of the transformer under high voltage conditions; the pulse function measurement method based on the surge voltage generator, the voltage is too high may cause the hidden danger of the CVT loss of the capacitor voltage transformer
The University of Toronto, Canada and other relevant research institutes are based on testing at the rated voltage of the internal magnetic components of the capacitive voltage transformer CVT, which is difficult to operate; Destroy internal components of capacitor voltage transformer CVT
In short, there is no method at home and abroad that can accurately test the broadband characteristics of capacitor voltage transformer CVT

Method used

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  • Method for testing broadband characteristic of CVT (capacitor voltage transformer) by high voltage harmonic
  • Method for testing broadband characteristic of CVT (capacitor voltage transformer) by high voltage harmonic
  • Method for testing broadband characteristic of CVT (capacitor voltage transformer) by high voltage harmonic

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Embodiment Construction

[0019] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0020] Connect each module correctly according to the electrical wiring diagram to form a test system:

[0021] The excitation source (a high-voltage harmonic source that can generate harmonic voltage within the 50th order, and the maximum voltage of 50Hz is 1kV), an oscilloscope (the number of channels is not less than 2, and the sampling rate is not lower than 10kHz) are used to collect capacitive voltage Transformer CVT primary side and secondary side voltage), computer (installed with spectrum analysis software) and capacitive voltage transformer CVT are connected correctly according to the electrical wiring diagram to form a test system. Such as figure 1 and figure 2 .

[0022] (2) Use a high-voltage harmonic...

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Abstract

The invention discloses a method for testing the broadband characteristic of a CVT (capacitor voltage transformer) by a high voltage harmonic in the technical field of electric power. The method has the technical scheme that a high voltage harmonic source of U1 (j omega) is applied between a high voltage end of the CVT and the ground, and the voltage U2 (j omega) of each frequency point at a secondary side and the input voltage U1 (j omega) at a primary side are tested to obtain the broadband transmission characteristic of the CVT through computation. The method disclosed by the invention has the beneficial effects that components of a higher harmonic can be accurately obtained, harmonic interference can be effectively inhibited through harmonic treatment guiding measures, and the quality of electric energy is improved.

Description

technical field [0001] The invention belongs to the technical field of electric power, and in particular relates to a high-voltage harmonic test method for CVT broadband characteristics. Background technique [0002] The quality of power supply is a hot spot that both users and power companies pay close attention to. With the development of the power grid, the construction of DC projects and new energy projects, switching power supplies, thyristor devices, wind turbines, etc. are more and more used in the power grid. On the one hand, these devices have improved people's utilization efficiency of electric energy, and on the other hand, they have formed a large number of harmonic currents in the power grid. The consequence is that other electronic products in the same power grid will be disturbed, and the harmonic current will also cause the overload of the neutral line current of the power grid, which will affect the power transmission capacity of the power grid. In additio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/02
Inventor 赵志斌曹敏王昕毕志周刘清蝉靳晓军
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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