What is the impact of harmonics on the actual lifespan of self-healing compensation capacitors
The harm of harmonics to the power grid and power equipment cannot be underestimated. For self-healing compensation capacitors, harmonic voltage and current will accelerate capacitor aging, seriously shortening the actual service life of compensation capacitors. In today's article, Xiaorong will specifically introduce how harmonics affect the actual service life of compensation capacitors? What can be done to avoid it as much as possible? Come and learn more!
Why do harmonics affect the actual lifespan of compensation capacitors?
1. Causing an increase in working voltage
Harmonics can cause the fundamental voltage at the terminals of self-healing compensation capacitors to superimpose, leading to voltage distortion at the compensation capacitor terminals and a continuous increase in actual operating voltage.
However, long-term overvoltage operation of capacitors can lead to an increase in operational failures and a rapid reduction in their lifespan.
2. Causing an increase in current
The impact of harmonic current will continuously increase the internal current of the compensation capacitor, and the total current of the capacitor will also change with the variation of high-order harmonic current.
This will cause the actual operating current of the self-healing compensation capacitor to be greater than 1.3 times the rated current, accelerate the aging of the capacitor insulation, and thus significantly shorten the actual service life of the capacitor.
3. Causing an increase in actual capacity
When the high-order harmonic current passes through the compensation capacitor, it will cause an increase in its actual capacity, severe heating, and a rapid rise in operating temperature. Over time, this will cause severe aging of the internal medium of the capacitor, affecting the actual service life of the self-healing compensation capacitor.
How to deal with system harmonics?
For situations with low harmonic content in the system, filtering capacitors or anti harmonic capacitors can be selected according to specific needs; If the harmonic content of the system is severe, the self-healing compensation capacitor circuit must be connected in series with a reactor.