Passive Harmonic Filter

With a passive harmonic filter, the harmonics reduce by absorbing it from the downstream load. It relieves harmonic stress on load end equipment and solves its failure and tripping problem. It permits the plant to achieve a full load run with reduced energy consumption. 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.

Unlike the ineffective series type passive harmonic filter, the highly effective passive harmonic filters are always parallel type harmonic filters. It eliminates load generated harmonics by drawing them towards it creating a short circuit path, and then absorbing harmonic within it. It thus eliminates the need for any equipment derating even with extreme harmonic distortions and allows plant operation at a hundred percentage loading for all plant machinery.

Unlike active filter, a high-power shunt passive harmonic filter is highly flexible for any input voltage design which covers the complete working voltage range of plant equipment from as low as 120 volts to 36 kV. It enhances the plant's 3P, power, productivity and profitability by manifold. We manufacture the most valued passive harmonic filter - type Super Tuned which is a top-end custom-built product.

When you have problems - repetitive failure in process drives, electronics, servers and in electrical equipment or unwanted tripping and high neutral current and neutral voltage; it will solve all your problem. Needless to say that it will mitigate harmonics (both voltage and current) to tolerable limits as defined by IEEE-519 standard. A super tuned harmonic filter is of high power capacity which reduces extremely high harmonic distortions in both voltage and current waveform within a safe working limit, thus identifying it as harmonic distortion filter.  

There are few other variants of passive harmonic filter though, series type passive harmonic filter, detuned harmonic filter and triplen harmonic filter. The series passive harmonic filter introduces an impedance before an individual load that reduces a little current harmonics, by the principle of ohm's law. It seems to work without causing equipment tripping problem when a transformer has very few non-linear-loads. Series harmonic filter finds its application connected in series, with a smaller non-linear-load, within a much bigger transformer wherein harmonics remain within IEEE-519 limits, thus indicating it as IEEE harmonic filter. But by doing so, it increases voltage harmonics which could cause tripping in sensitive electronics and VFD drives, with little voltage fluctuation, if there are sizeable series harmonic filters within a transformer.  

De-Tuned filters do not mitigate harmonics but improve power-factor (PF). When its added to an electrical power system, it creates two paths. One path is into the filter, and another is toward the source. The harmonic current does not flow into the detuned-filter as it offers a high impedance path and diverts into the low impedance source, as per the current divider rule of ohm's law.

Data center servers, electronic gadgets and large LED light installations generate high neutral harmonic current wherein neutral current equals the phase current. Besides, that increases the neutral voltage. It's triplen harmonic filter which suppresses neutral harmonics and mitigates high neutral voltage across UPS loads. It has many names being a neutral current eliminator - zero-sequence harmonic filter, third harmonic filter and 3rd harmonic filter.

Passive harmonic filter - why Super Tuned?

1. It Eliminates equipment Failure and voltage fluctuation Tripping.

2. It Prevents Arc Flash and Electrical Blasting. Refer to the case study.

3. It Reduces the running temperature of equipment. We have achieved up to 10-deg.C.

4. It Reduces CAPEX and footprint by eliminating the need for that costly de-rating.

5. It Reduces OPEX, first by reducing footprint and then by enhancing energy efficiency.

6. It Reduces end product quality rejection. We have achieved up to 50% on six-sigma scale.
 

How Power and Harmonics Flow?

1. Being a Current Source, it flows in the opposite direction from downstream load to all branches in the upstream power system.

2. By Ohm’s Law, it flows across all paths in the power system based on each path’s relative impedance. Along its flow path, two-events happen.

3. Firstly, the downstream equipment and cables, designed for 50/ 60Hz absorbs these high-frequency harmonics causing excessive stress to themselves. It causes equipment failure, high running temp, tripping and malfunction. The super tuned passive harmonic filter by creating a short-circuit path diverts the harmonics and troubleshoots the problem.

4. Secondly, the grid being relatively a lower impedance path absorbs the remaining harmonics leftover by the downstream plant and machinery. The active harmonic filter prevents these harmonics from going over to the upstream grid.

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.

2. 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. Besides, it's a stored energy LC power bank which will oppose any momentary change in voltage fluctuation, either sag or swell and power surge which may originate either within the plant or outside in the grid. A passive harmonic filter is an indispensable tool in eliminating nuisance tripping of critical plant equipment - process drives, control system, computers, server to name a few.

4. By relieving the downstream equipment from the burden of harmonic absorption, it eliminates that need for costly de-rating saving CAPEX and equipment footprint cost.   

5. It saves OPEX cost in the manifold. Firstly, it eliminates harmonics naturally and allows full load plant operation sustainably. Secondly, it troubleshoots failures and thirdly it enhances energy efficiency.

6. The harmonious operation with the optimum power quality results in lesser end-product quality rejections which we have tracked up to 50% savings on Six-Sigma Scale.

Passive Harmonic Filter - why direct corporate clients select us?

1. There's no-one like it before and someone that you like has arrived. We pride in manufacturing the most Beautiful passive harmonic filter - super tuned type.

2. Its beauty is a deception. It's a monster. It mercilessly Slashes down harmonics as no-one did before.

3. It's Rough and Tough (IP55) to withstand a harsh environment. Unlike active harmonic filter, it does not need an air-conditioned room installation.

4. It's 50kA, 1sec Short-Circuit proof, and Basic Insulation Level (BIL) compatible for 12kV/ 4kV. That withhold Arc-Flash hazard.   

5. This beauty is for ever. Its design life is over 40-years.

6. It's Fully Automatic, Variable and adjusts with process load variations and harmonic distortions in the power system.  

7. Thanks to you, our 350+ corporate clients, for believing in it and every time designing your projects with it. Your trust on us, over three decades, has catapulted Encon's passive harmonic filter as the most valued brand in today's world market.