×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

thread237-100416 Just wanted to we

thread237-100416 Just wanted to we

thread237-100416 Just wanted to we

(OP)
thread237-100416: 60Hz AC motor at 120Hz?
Just wanted to weigh in on using a VFD as a power supply where PD measurement will be performed. I worked for Hipotronics for many years and am very familiar with performing PD on transformers at 180Hz. If you are using a VFD to power the DUT, there are some issues to consider:
1. The VFD will radiate high frequency components which could be seen by the PD system as PD in the transformer typical PD frequency range is 30 to 300 kHz.
2. The VFD without a lot of filtering will cause "noise" in the DUT output which also can bee seen as PD. Typical filtering for a VFD would consist of inductor/capacitor stages in each phase (series L and parallel C to ground 20db/decade).
This is why typically a motor generator set is used. However it has been done using VFD's and filtering. I just wanted thread originator to be aware.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

White Paper - PLM and ERP: Their Respective Roles in Modern Manufacturing
Leading manufacturers are aligning their people, processes, and tools from initial product ideation through to field service. They do so by providing access to product and enterprise data in the context of each person’s domain expertise. However, it can be complicated and costly to unite engineering with the factory and supply chain. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close