Published: 03/14/2006
| Question: | Power Line Harmonics and Installation Considerations for AC and DC Drives |
| Answer: | Yaskawa General-Purpose Inverter Technical Information
| Classification | Precautions on Application | Model | GN | Document No. | YEA-P-01-GN-01 |
| Title | Power Line Harmonics Considerations for DC Drives and AC Drives |  | | | |
Harmonic Current Countermeasure Comparison DC Choke and AC Reactor
The following chart is a visual comparison of the various harmonic countermeasures as it relates to current distortion. These relationships can be used for estimating the reduction in total current distortion (ITHD) as compared to standard VFDs. If estimated ITHD is 75% of the fundamental, installing a 3% three phase input reactor or DC Link Choke should drop ITHD to 38%, (75% * 0.48 =).
Understandably, this is a rough estimate, but may be useful when quoting some VFD jobs.
The following chart shows the harmonics ratio for each harmonic order with the fundamental wave at 100% in a three-phase diode bridge with DC bus capacitor filter.
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Product Information:
| Product Group: | Inverters/Drives |
| Product: | F7 Drive |
| Applications: | |
| Category: | Harmonics; Isolation Transformers; Power Quality; Reactors |
Other Information:
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Please read and understand the product instruction manual before installing, servicing or operating Yaskawa products. FAQ content and illustrations are provided as technical advice to augment the information in manual, not superceed it. It is not possible to give detailed instructions for all types of installation or support activities. The information described in the FAQs are subject to change without notice to improve the product or FAQ. Yaskawa assumes no responsibility for errors or omissions or damages resulting from the use of the information contained in any FAQ.
All warnings, cautions and product instruction for product use must be followed. Installation, operation and maintenance should be carried out by qualified personnel. Failure to observe these and other precautions highlighted in the product manuals will expose the user to high voltages resulting in, serious injury or death. Qualified personnel are defined as individuals who are familiar with the installation, starting, operation and maintenance of Yaskawa products of the type described and have proper qualifications to perform the work.
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