The harm of harmonics to power capacitors mainly includes the following aspects
1. Overcurrent and Overload
-Harmonics can cause distortion of voltage and current at the capacitor terminals, especially at specific harmonic frequencies, where capacitors resonate with inductive components in the system, resulting in significant amplification of harmonic currents. Excessive harmonic current causes the actual current of the capacitor to be much greater than its rated current, resulting in overload and overheating of the capacitor.
2. Increased losses and excessive temperature rise
-The presence of harmonics will increase the power loss of capacitors, that is, capacitors will generate additional heat loss when dealing with harmonic currents. When the harmonic content is too high, the dielectric loss of the capacitor increases rapidly, leading to an increase in temperature, accelerated aging of the insulation medium, and shortened service life of the capacitor.
3. Insulation damage and partial discharge
-High temperature can cause a decrease in the performance of the insulation material inside the capacitor, which may lead to increased partial discharge and further damage to the internal structure of the capacitor. Prolonged partial discharge can greatly weaken the insulation performance, ultimately leading to capacitor damage.
4. Terminal burned out
-When harmonic current passes through a capacitor, the instantaneous peak value of the current increases, and the contact resistance at the terminals may increase due to heating. Long term overheating may cause the capacitor terminals to burn out.
5. Increased mechanical stress
-Strong harmonic currents can also cause mechanical vibrations between the internal plates of capacitors, known as mechanical resonance, which may lead to damage to the internal structure of the capacitor.
6. Harmonic amplification and deterioration of power grid quality
-When capacitors are connected to a power grid with existing harmonic distortion, it is possible to exacerbate the harmonic situation of the power grid, resulting in harmonic amplification, which further affects the power quality and supply reliability of the entire power grid.
Therefore, in modern power systems, in order to reduce the impact of harmonics on power capacitors and other electrical equipment, methods such as installing filters, improving capacitor design to enhance harmonic resistance, and reasonably configuring capacitor banks and reactors are usually used to suppress harmonic effects.
We found many capacitors damaged due to high harmonics in a factory, resulting in bulging. We have installed AHF for our customers to control harmonics and achieved good results!
If you are interested, feel free to send me your business email and whatsapp to send you our brochure. Give me your comments, tell me your request, and I'll come back within 24 hours with the best solution(s) you need.
Subscribe to us to enjoy event prices and get some of the best prices.