TCI HGA Manual - Manual (Page 13)

13
General Terminology
Throughout this manual, many different terms are used. A list of some typical terms can be found
below. These are provided in order to assist with the overall understanding of the manual. Please feel
free to contact TCI directly if there are any questions regarding any portion of this manual.
HarmonicGuard Active Filter - TCI’s brand name for a real time filter that mitigates harmonics while
also maintaining near unity power factor. An Active Harmonic Filter is any piece of equipment that
actively monitors and changes the incoming AC line current.
HGA – The term commonly used in place of the entire brand name of HarmonicGuard Active filter.
Active Harmonic Filter - An active harmonic filter is a piece of equipment that reads the incoming
voltage and current and injects current waveforms that cancel distortion. This term is commonly used
in place of the entire brand name of HarmonicGuard Active filter.
Bus-Applied Filter – A shunt device connected in parallel to the load. This is an active filter designed
to mitigate the harmonics associated with multiple loads. The filter is directly connected to a main bus
as can be found in a typical Motor Control Center. The filter is sized for the amount of corrective
current needed to be injected to cancel the offending harmonics. A Digital Signal Processor (DSP)
pulse width modulated controller is used for switching Insulated Gate Bipolar Transistor (IGBT) in
order to cancel the harmonics.
Power Converter - The power converter is the digital filter module of the HarmonicGuard Active filter.
Non-Linear Load Input Line Inductor – The three phase line reactor connected at the input of an
adjustable frequency drive or other non-linear load.
Converter Inductor – The three phase inductor maintains a uniform air gap to give highly consistent
and predictable inductance. These inductors are connected to the inverter which buffers the inverter
output from the analog portion of the filter, the source, and connected drives.
Current Transformer (CT) – The device that monitors the incoming AC current waveform typically
sized to handle the total connected load.