×
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

Shielding of Cables in substation

Shielding of Cables in substation

Shielding of Cables in substation

(OP)
Does anybody have experience or know of options on how to shield cables that are near high frequency, high magnitude currents?  Coupling from Capacitor switching currents is creating short duration, high frequency, high magnitude voltages(1000 Volts phase-neutral) on some PT cables that are running back to the panel house across the substation.  

RE: Shielding of Cables in substation


From a standards/boilerplate perspective, there is IEEE text
525-1992(R1999) §3 in …Design and Installation of Cable Systems in Substations
1050-1996 §6 in …Instrumentation Control Equipment Grounding in Generating Stations

Descriptions at    
standards.ieee.org/reading/ieee/std_public/description/subst/525-1992_desc.html
standards.ieee.org/reading/ieee/std_public/description/nuclear/1050-1996_desc.html
  

RE: Shielding of Cables in substation

See  
Reduction of interference on substation low voltage wiring; Gavazza, R.J. & Wiggins, C.M.; IEEE Transactions on Power Delivery, Volume: 11, Issue: 3, July 1996, Pages:1317 - 1329.

Abstract:
This paper describes test results and mitigation methods of electromagnetic interference (EMI) on control and low voltage circuits in substations caused by air disconnect switch operation. The tests are focused on a comparison between unshielded and shielded circuits from capacitively coupled voltage transformers (CCVT) and other equipment circuits in the vicinity. New test data are presented comparing unshielded and shielded cables and transient currents on all connections to the CCVT including the pedestal and ground strap. The paper gives a practical and understandable explanation of the causes of EMI in substations and how shielded cable and parallel ground conductors reduce interference. Design guidelines are listed in the conclusion.

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