Chapter 8 : Optional Accessories; Input Harmonic Filter - Delta NT Series User Manual

Chapter 8 : Optional Accessories

suggested.
The 12-pluse rectifier is composed of one transformer and two rectifiers. After
receiving the AC input power, the transformer will (1) transfer the input voltage into
total input current harmonic distortion considerably.
In general, the total input current harmonic distortion is about 32~38% with use
harmonic distortion to 10~18%.
AC INPUT

8.2 Input Harmonic Filter

Besides the 12-pluse rectifier, the passive-type input harmonic filter (L-C filter) is
another solution to reducing the total input current harmonic distortion. Moreover, it
is also a means to improve the input power factor of the UPS.
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Chapter 8 Optional Accessories
Figure 8-1.
RECT 1
RECT 2
th th
and 7
DC BUS
th
passive-