Product Description
HarmonicShield
®
HSD IOM Manual - Rev. D
11
Product Description
HSD Drive-Applied Filter
The HSD is a drive-applied harmonic filter designed and developed by TCI to reduce the harmonic
currents drawn from the power source by VFDs. The published HSD voltage, Power (Hp or kW) and
current ratings apply to matching power (Hp or kW) rated standard VFDs with six-pulse diode bridge
rectifiers. The HSD may also be sized to filter other loads such as SCR six-step drives, SCR Direct
Current (DC) motor drives, thyristor furnaces, battery chargers, electroplating supplies or other types of
non linear loads. In many cases, the filter power rating (Hp or kW) will differ from load power rating
(Hp or kW). Please contact TCI Technical Support for additional information and support on sizing HSD
harmonic filters for your non six-pulse diode front end VFD applications.
The HSD is a passive filter connected in series with the input terminals of a VFD or several VFDs that
operate as a group. It is designed to provide a low impedance path for the major harmonic currents
demanded by the drive. The filter is a stand-alone device that is furnished in its own enclosure and
mounted adjacent to the drive.
The HSD filters consist minimally of the following features and components:
•
A KDR tuned series reactor to prevent system interaction and improve filter performance
•
An L-C-L filter circuit with:
o
A TCI 3-phase tuning reactor specifically designed for the HSD filter
o
High-endurance, harmonic-rated capacitors
o
Bleeder resistors to ensure safe capacitor discharge upon filter shutdown
Filter Configuration
Figure 1: HSD Connection Diagram 3HP to 10HP
