Letters

Don't hesitate.
Tell us what you like, and what we can do better. Share your thoughts and experience.

I would like to see a section on Tips and Tricks: how to test faster, how to do something easier, suggestions by vendors, etc.
Also a section on how to quickly calculate settings in the field for commissioning would be useful.
Luis Antonio Soto R., Mexico

PAC World: Dear Luis Antonio, we plan to have an issue next year dedicated to testing. However, we would like to encourage our readers to share their knowledge of the subjects mentioned in Luis' e-mail.

In the article "A Pilot Protection system Failure - An Investigation," Mr. Collin M. Martin mentioned the term "FID rating" on page 29 of the Winter 2008 issue. I've never heard this term. What does it mean?
João Ricardo da Mata Soares de Souza, Brazil

PAC World: Dear Ricardo, the following is the response we received from the author of the article:
FID = Fault Interrupting Device. In this instance FID is referring to circuit switchers that are only rated to interrupt 20kA. De pending on the fault, the current could be higher than the interrupting rating so they are blocked from operating in these cases.
This adds some complexity/sensitivity to the relay coordination because the line relays must see these faults and operate quickly.

Thanks for the wonderful magazine. Finally a magazine that I feel like carrying with me wherever I go. Keep up the good work!
Amitava Maity

I found your magazine/web site very interesting and useful. In order inform other specialists about it, the following e-mail was sent to hundreds of people who are active in the Protection, Automation and Control world. Your activities are very valuable and I want to thank everybody who supports this idea.
Mehdi Gerivani, Iran

PAC World: Dear Mehdi, thank you for spreading the word about PAC World. Please also encourage your colleagues to share their experiences through articles, comments, photos and anything else they think would be of interest.

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