Answer / nagesh.patwari

Passive Flitering-

An LC circuit, tuned to each harmonic order to be filtered, is installed in parallel with the non-linear load. This bypass circuit absorbs the harmonics, thus avoiding their flow in the distribution network.

Generally speaking, the passive filter(LC series ckt in parallel with Non linear load ) is tuned to a harmonic order close to the order to be eliminated. Several parallel-connected branches of Passive filters can be used if a significant reduction in the distortion of a number of harmonic orders is required. It offers both power-factor correction and high current-filtering capacity .Passive filters also reduce the harmonic voltages in installations where the supply voltage is disturbed. If the level of reactive power supplied is high, it is advised to turn off the passive filter at times when the percent load is low.

AHC Active harmonics filter-
AHC comprising power electronics and can be installed in series or parallel with the non-linear load, compensate the harmonic current or voltage drawn by the load. A parallel-connected active harmonic conditioner (AHC) compensating the harmonic current (Iharm = -Iactiv) by injecting Iactiv in opposite phase.
The AHC injects in opposite phase active current the harmonics drawn by the non-linear load, such that the line current Is remains sinusoidal.

Hybrid Filtering (Combined Active & Passive Filter)
Passive and active filters are combined in a single system to constitute a hybrid filter. This new filtering solution offers the advantages of both types of filters and covers a wide range of power and performance levels.

What do you mean by distribution transformers?

0 Answers  

---

why we earth only one side of a power cable. And which side is advisable to earth.

1 Answers  

---

what is difference between 9kv 5ka surge arrester and 9kv 10ka surge arrester.

0 Answers   Voltamp,

---

Why do we mix soda with water in LRS?

1 Answers  

---

How to Design green buildings services? What is the advantage to design green building?

0 Answers  

---

how the calculation is done if the DG set require for the -- -48 to -51v 4000 ah battery set .

1 Answers   BSNL,

---

What is the difference between cylindrical-type and sandwich-type winding?

0 Answers  

---

What is Synchronization of generator,where and how it is achieved.

1 Answers   HEC,

---

What happens to voltage when current is zero?

0 Answers  

---

How regulator control the fan speed?

4 Answers  

---

If the line voltage is reduced to 75% of its rated value then by what percentage current will reduce ?? 75% 25% 50% no change and why ?

0 Answers  

---

what is the reason for harmonics introduced in the line

2 Answers  

---