Capacitor electric heating aging test platform with direct current superposed harmonic waves

Abstract

According to the electric heating aging test platform for the capacitor with the direct current superposed with the harmonic waves, a temperature control air blowing box is provided with a closed cavity so as to maintain the environment temperature of a capacitor test object in the temperature control air blowing box, and a variable-frequency power source provides sine-wave voltages with different frequencies and different amplitudes; the isolation capacitor is connected in series with the variable-frequency power supply and then connected in parallel with the capacitor test object, the isolation capacitor isolates direct-current voltage to enable voltage applied to two ends of the capacitor test object to be direct-current superposition harmonic voltage, and the direct-current power supply provides direct-current voltage with different amplitudes; the protection resistor is connected in series with a DC power supply and then connected in parallel with a capacitor sample The thermodetector is connected with the temperature control blast box and monitors temperature data of the capacitor test object and the temperature control blast box in real time; the oscilloscope is connected with the capacitor test object to measure actual voltage values applied to two ends of the capacitor test object.

Description

technical field [0001] The invention relates to the technical field of capacitor aging testing, in particular to a capacitor electrothermal aging test platform with DC superimposed harmonics. Background technique [0002] With the improvement of my country's environmental protection awareness and the requirements for new energy technologies, flexible DC transmission technology has developed rapidly. As an energy storage element, the DC support capacitor is widely used in the most critical core part of the flexible DC transmission system because of its advantages of high reliability, dry oil-free, high operating field strength, small loss, and small size. In the converter, it plays an important role in stabilizing voltage and filtering harmonics. [0003] DC support capacitors often need to withstand a working field strength of about 200kV / mm and a harmonic content of 10% to 30% during operation. This means that the actual operating field strength of the DC support capacito...

AI Technical Summary

Problems solved by technology

This means that the actual operating field strength of the DC support capacitor is very high, and the existence of harmonics will not only increase the temperature of the equipment, but also cause mechanical fatigue damage to the equipment

Under the long-term coupling effect of electricity, heat, and force, capacitors will inevitably age or even fail, which seriously affects the stable operation of the power system.

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