×
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

Jobs

Prospective permissible touch voltage in acc. to EN50522

Prospective permissible touch voltage in acc. to EN50522

Prospective permissible touch voltage in acc. to EN50522

(OP)
Dear all,
I have read discussion between IrishPower and radug.
thread238-305712: Calculation of Touch and Step Voltage Limits using EN50522

Unfortunately I face the same problem - how given in figure B.2 /Annex B/ curves are calculated?
In standard EN50522 equations missing.

Will be great if someone can help.

Best regards!

RE: Prospective permissible touch voltage in acc. to EN50522

Hi PeZeKa,

The EN50522 standard doesn't make things easy, but it is possible to recreate the curves in Figure 4 and Figure B.2 using the equations shown in Annex A and Annex B (with more accuracy at some points than others...), and to use the same process to come up with alternative curves if required.

You will see from the previous discussion that radug was able to get reasonably close to matching the results for Figure 4, and we ended up getting similar results ourselves for more data points using MS Excel and VLOOKUP functions. We came to the conclusion that the differences between our results, radug's results and the sample results shown in Table B.3 of the standard are most likely due to rounding/simplification of some of the input data shown in Table B.1 and Table B.2 compared to whatever input data Figure 4 was actually based on. We got differences of up to +/- 8 % between our calculated values and the Figure 4 values (for some fault durations only; most values were much closer).

The Figure 4 curves are calculated by averaging weighted results of the four different cases described in Note 1 of Annex A of the standard. Once you have the methodology for this figured out, by comparison working out the results for Figure B.2 becomes a lot easier...

Hope this helps - best of luck!

IP

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!


Resources