Test system and method for influences of harmonic waves on temperature rise and loss of parallel capacitors

A test method and capacitor technology, applied in the direction of instruments, measuring electricity, measuring electrical variables, etc., to achieve the effect of comprehensive and high accuracy of test data

Active Publication Date: 2015-01-21
STATE GRID CORP OF CHINA +4
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Problems solved by technology

[0004] In order to solve the problem of the test method of temperature rise and loss of parallel power capacitors in the prior art, the present invention p

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  • Test system and method for influences of harmonic waves on temperature rise and loss of parallel capacitors
  • Test system and method for influences of harmonic waves on temperature rise and loss of parallel capacitors
  • Test system and method for influences of harmonic waves on temperature rise and loss of parallel capacitors

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Embodiment Construction

[0039] The present invention will be further described below in conjunction with the accompanying drawings.

[0040] Wire the modules according to the electrical wiring figure 1 Correct wiring, connect the harmonic source with 3 single-phase capacitors to form a test system.

[0041] The test system for the influence of harmonics on the temperature rise and loss of parallel capacitors, including a harmonic source (1), a voltage and current transformer (2), a plurality of capacitors (7), a power quality analyzer (3), and a waveform recorder (4), an infrared thermal imager (5) and a mercury thermometer (6), the harmonic source (1) can emit fundamental waves and harmonics of different amplitudes and phases and transmit them to the voltage and current transformers (2) ), the voltage and current transformer (2) is connected with the capacitor (7) through the data line, and the power quality analyzer (3) performs the voltage and current flow through the capacitor (7) through the vo...

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Abstract

The invention discloses a test system and method for influences of harmonic waves on the temperature rise and the loss of parallel capacitors. The method is characterized by including the following steps that first, a harmonic source is adjusted so that the harmonic source can give out a fundamental wave voltage equal to the rated voltage of the capacitors and harmonic voltages different in time number and content, and the temperature and the voltage and current values of the capacitors are observed and recorded; second, it is guaranteed that the total voltage effective value output by the harmonic source is equal to the rated voltage of the capacitors according to the constant-voltage method calculation formula, and the temperature and the voltage and current values of the capacitors are observed and recorded; third, it is guaranteed that the total fundamental wave and harmonic current effective value output by the harmonic source is equal to the rated current of the capacitors according to the constant-current calculation formula, and the temperature and the voltage and current values of the capacitors are observed and recorded. Through the system and method, the influences of harmonic waves on the temperature rise and the loss of the parallel capacitors can be scientifically and effectively tested, the change conditions of the temperature rise and the loss of the parallel capacitors under the condition of different harmonic waves are obtained, and test data are comprehensive and high in accuracy.

Description

technical field [0001] The invention relates to the technical field of power systems and power equipment, in particular to a test system and test method for the influence of harmonics on the temperature rise and loss of parallel capacitors. Background technique [0002] At present, high-power power electronic devices are one of the important pollution sources of the power system, which will generate a large number of harmonic voltages and harmonic currents in the power grid, which will have many adverse effects on the operation of the power system, and make the production, transmission and use of electric energy. The efficiency decreases, the additional loss increases, and in severe cases, it can lead to the failure or damage of electrical equipment. In addition, when a reactive power compensation capacitor is installed in a power system with harmonics, the harmonics will be amplified under certain conditions, and even cause local resonance of the power system, resulting in ...

Claims

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Application Information

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IPC IPC(8): G01R31/00
Inventor 陈兵陈龙康文斌彭庆华许杏桃李国欣查志鹏姚宏伟
Owner STATE GRID CORP OF CHINA
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