Active Harmonic FilterRead this case study of the advantages and disadvantages of the active harmonic filter and how passive filter installation removes harmonics, voltage surges and improves PF.

Its efficacy depends upon the stability of the connected external power source.AHF design needs passive components like a capacitor and a resistor, but it can either do harmonic control or power factor correction to its 100% rating.

In the case of both PF improvement and harmonic reduction, its capacity needs a derating to 50%.

It inherits the fixed design capacitors which restrict it from scaling up for higher loads that including applying it at the transformer or DG PCC for the full utility load which may include hundreds of VFD drives and other non-linear loads.

We have applied passive filters across thousand of diesel generators (DG) and also at Turbo generators (TG) since our inception in 1995.

With the elimination of both voltage and current harmonics, it debottlenecks DG/TG's capacity limitation which allows extra load on the DG to the extent of 30%, solves its hunting, AVR voltage fluctuation problem and saves good energy and fuel.Active Harmonic Filter- failure issue with power surge and voltage fluctuationFig.2.

Harmonic DistortionWhen a plant with high NLL runs at full load, it crams harmonics and active power in the power system, causing unacceptable energy surge wherein harmonic distortion is the ratio of harmonics to fundamental-power.

Total harmonic distortion (THD) and distortion factor are related terms defined by the ratio of square root sum of all high-frequency harmonic components to the fundamental frequency power.

The high-frequency harmonics are the integer multiples of fundamental-frequency which do no useful-work and get wasted by heating-up plant equipment.The Harmonic Distortion Filter is not a mass manufacturing process.

Limit both THDv (Total Voltage Harmonic Distortions) and THDi (Total Current Harmonic distortions) and reconstruct distorted waveform back into Sine Wave, as shown in the caption picture above, a technology that improves and transforms the fuel guzzling, bad power quality dirty power into Clean Quality Power.2.

Enhance plant's 3P, Power, Productivity, and Profitability.3.

Eliminate equipment maloperation across all industrial, commercial and building operations.

Harmonic FilterWhen super tuned, the electrical harmonic filter turns a multitasker that eliminates harmonics, maintains power system stability by mitigating power surge, voltage fluctuation and resonance.

Besides, it relives station generators from momentary voltage fluctuations and power surges over a grid or internal power disturbance which helps in eliminating premature winding insulation failure of the generator.A quality harmonic filter panel is custom-built for the project needs with incremental costs and complexities.

In its basic specification, it provides a low impedance parallel path which enables current harmonics from its source at downstream loads to flow into it and allows a tolerable level of current harmonics, within IEEE-519 norm, to flow into the upstream utility grid.

However, basic harmonic filters can't control high harmonic levels.

Whereas, a top-end harmonic filter mitigates both current and voltage harmonic distortion from any higher level to within limits.Harmonic Filter - a tool that prevents Arc FlashA mandate that is increasingly becoming noticeable among electrical engineers and safety regulators is the NEPA 70E standard.

Arc flash - what's the Root Cause?The switching frequency (also called carrier frequency) of a VFD drive is the rate at which it's DC bus voltage is switched on and off during pulse width modulation (PWM) process.

Passive Harmonic FilterWith a passive harmonic filter, the harmonics reduce by absorbing it from the downstream load.

Encon facilitates the best harmonic solutions.

Engineers worldwide depend on passive harmonic filters when the electric-load is sizeable, harmonic distortions alarming and yet there's a need to slash equipment footprint by designing a full load plant operation.Passive Harmonic Filter - why a reliable troubleshooter?1.

It alters the dynamics of the harmonic flow by creating a Short-Circuit path for the flow of harmonic frequencies like 250hz for 5th harmonic etc.Passive Harmonic Filter - Working Principle2.

The load harmonics now, instead of getting absorbed in the downstream loads, are diverted as soon as it’s produced through this short-circuit path into the filter, thus solving equipment failures, tripping, and malfunctions.

It allows only a small harmonics within a limit over to the grid, meeting the IEEE 519 harmonic standard, for both voltage and current harmonics.3.