Capacitive voltage transformer and measurement method suitable for high voltage harmonic measurement

Abstract

The invention relates to a capacitor voltage transformer suitable for high-voltage harmonic measurement and a measurement method. The capacitor voltage transformer is characterized in that a current transformer is respectively connected into a low-voltage capacitance branch and an intermediate transformer branch of a capacitive voltage divider of the capacitor voltage transformer in series, two conventional current transformers are additionally arranged in a conventional capacitor voltage transformer, and the size and the phase position of harmonic voltage of a high-voltage system can be worked out by using electric currents measured by the two current transformers. Therefore, the capacitor voltage transformer has the advantages of being simple in structure and convenient to realize, having high measurement accuracy of voltage harmonics, being free of influence of the size of a load of the capacitor voltage transformer and having very high application value and market promotion prospect in occasions where high-voltage harmonics are measured.

Description

technical field [0001] The invention relates to a capacitive voltage transformer and a measuring method, in particular to a capacitive voltage transformer and a measuring method suitable for high-voltage harmonic measurement. Background technique [0002] The increasing application of non-linear loads in power systems leads to more and more serious problems of voltage distortion in high-voltage power systems. The power supply department and scientific research institutions urgently need to measure the voltage harmonics of the high-voltage power system to understand the voltage harmonic status of the high-voltage system and formulate targeted harmonic control measures. [0003] However, among the currently used high-voltage harmonic measurement methods and equipment, the solutions of voltage division by resistors and capacitors require special equipment, and these equipment are bulky and expensive. Capacitive voltage transformers are widely used because of their small size, ...

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Problems solved by technology

However, this scheme needs to analyze the frequency response characteristics of various types of capacitive voltage transformers offline, and the detailed structure and component parameters of the capacitor voltage transformers need to be known, and the frequency response characteristics under different load conditions are also different, so This method is more complicated to implement, which limits its application and promotion.

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