Fluorescent lamps are a non-linear load and generate harmonic currents in the electrical power supply.
2.
Harmonic currents can be reduced by a filter placed at the input of the device.
3.
Non-linear loads create harmonic currents in addition to the original ( fundamental frequency ) AC current.
4.
Hence, harmonic currents will reduce the power factor.
5.
Filters consisting of linear capacitors and inductors can prevent harmonic currents from entering the supplying system.
6.
A TCR operating with ? > 90?generates substantial amounts of harmonic currents, particularly at 3rd, 5th and 7th harmonics.
7.
The delta winding allows third-harmonic currents to circulate within the transformer, and prevents third-harmonic currents from flowing in the supply line.
8.
The delta winding allows third-harmonic currents to circulate within the transformer, and prevents third-harmonic currents from flowing in the supply line.
9.
On the AC side, the converter behaves approximately as a current source, injecting both grid-frequency and harmonic currents into the AC network.
10.
An active power factor correction circuit at the input would generally reduce the harmonic currents further and maintain the power factor closer to unity.
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