HARMONIC FILTER PLANT
SYMPTOMSOFHARMONICSWHENITPRESENTIN SYSTEM
- IncreaseKVADemand.
- NeutralOverloading&excessiveN-G Voltage.
- ExcessiveCapacitorcurrent,frequentcapacitorfailure.
- Overheatingoftransformer.
- Errorinelectricitymeteringi.e.erratic meterreading.
CAUSESOFHARMONICS
Harmonics are generated by various sources which inherently have non–linear loadlike VFD, Diode, Computer, &all electronics equipment’s. That is generally where frequency as well as voltage conversion system are used. These loads use current in a pulsating manner at times of feed harmonic currents back into the wiring.In nonlinear load current waveform is different from voltage waveform. The major equipment’s which generates Harmonics.
- AC/DC Drives
- VFD
- LED
- Booster
- Converters
- Electronicsload
STANDARDHARMONICLIMITAS PERIEEE
InstituteElectrical&ElectronicsEngineering(IEEE)hasset recommendedlimit onbothcurrent &voltagedistortioninIEEE519-1992
HARMONICSFILTERCONSISTSOF
1.DoubleDielectrictypeultra-heavydutyAllPPCapacitor
2.DrytypeAluminum/ CopperReactor(percentageofreactanceisdependsonharmonicslevel)
3.ConductingMaterial:99%pureAluminumfoil
4.Housing—CRCA/ StainlesssteelPanel.
5.Busbar–Aluminum/ Copper.
6.Finish–Anticorrosive&UVProtectedpowdercoating.
Active Harmonic Filtering
Provides harmonic compensation by being installed on the line side of the offending load (for example, VSD).They introduce current waveforms which cancel out undesired harmonic components.
Passive harmonic filtering
Uses a combination of reactors and capacitors to filter out harmonic frequencies.
Line and load reactors
Reactors are used to provide current limiting. Reactors oppose rapid changes in current and hence limit spikes as a result of current pulses
