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Why Choose Active Harmonic Filters Over Passive Harmonic Filters?

In Chennai, a power supply of an average of 1000MW is given by the power plants. The electricity that comes from these power plants is not clean. The harmonics can cause equipment malfunction or failure because of the voltage fluctuations and distortions in the supply line that can deteriorate the voltage quality. Harmonic Filters reduce risks by reducing harmonic – and you always want to keep the harmonic pollution to under 5%.

One way of reducing harmonic pollution is by using Harmonic Filters. A harmonic filter reduces harmonic pollution and improves Power Quality by dynamic filtering of currents. They are installed for plants and households to improve overall current and voltage outputs. They come in two variants – Active Harmonic Filters (AHF) and Passive Harmonic Filters (PHF).

Passive Harmonic Filters mitigate harmonics by filtering the current wave through an input reactor, output reactor, shunt reactor, and capacitor. They are only limited to individual and stable loads. They are usually limited to their effectiveness and capacity and cannot work with many non-linear loads.

Active Harmonic Filters are used to eliminate or mitigate harmonics from the power received by using a series of transistors and capacitors to clean the current fluctuations. They are larger than Harmonic filters and require more space. They are useful for factories where a constant electricity output is necessary. And they are most effective in maintaining businesses by guaranteeing reduced costs and ongoing outputs.

Also Read: What Are Active Harmonic Filters And Its Application?

Advantages of AHFs over PHFs

In modern-day Chennai, as demand for more output increases, we must consider which filters we use for our plants. And we recommend AHFs over PHFs. Here’s why:

  • Active Harmonic Filters provide far more dynamic and superior flexibility in performance as compared to Passive Harmonic Filters.
  • Not all PHFs can achieve the IEEE-519 standards (for harmonic pollution, as mentioned above) even at full load. PHFs provide less overall mitigation as load decreases. AHFs can achieve the 5% limit even under 10% load.
  • AHFs won't cause a leading PF at no-load conditions. This is important as it helps improve the quality of the current. PHFs, on the other hand, do.
  • They can be installed anywhere in the plant line up, and due to their size, even the largest of plants only require 2-3 AHFs. PHFs, on the other hand, need to be installed at every Voltage receiving device. And granted that their sizes are less, a problem is faced when it comes to maintenance.
  • They are very cost-effective compared to PHFs, as we only require one unit for the entire assembly. Thus they are more economical for correcting harmonics for multiple voltage receiving devices.
  • There is a significant quality improvement over PHFs.
  • AHFs won't overload when the load is full.
  • If an AHF is rendered incapacitated, the motors used for optimizing power won't be affected. This is because the current itself doesn't run through the filters and runs through a set of parallel channels.
  • They are a viable option for long term use.

Since Chennai is now the hub for many businesses, Nantech has the best AHFs to buy in Chennai.
Happy Shopping!

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Author: Nantech Team
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