×
Follow Us
Results 1 to 5 of 5

VLF Test Ratings

 Jump to latest post
    #1
  1. Join Date
    Jun 2018
    Posts
    23
    Reputation

    VLF Test Ratings

    Hi guys,
    I need to perform VLF test on one set cable. The cable rating is 12/20 kV but opeation voltage is 15 kV. So what is the right VLF Test ratings for these cables?
    Thanks.

  2. #2
  3. Kalbi_Rob's Avatar
    Kalbi_Rob is offline Experienced Member Pro Subscriber
    Join Date
    Feb 2018
    Location
    Jacksonville, NC
    Posts
    290
    Reputation
    Quote Originally Posted by changeabilities View Post
    Hi guys,
    I need to perform VLF test on one set cable. The cable rating is 12/20 kV but opeation voltage is 15 kV. So what is the right VLF Test ratings for these cables?
    Thanks.
    Click image for larger version. 

Name:	IEEE 400.2 Table 3.png 
Views:	6 
Size:	176.7 KB 
ID:	393

    If the cable is rated for 20kV then I would say 26kV for Acceptance and 20kV for Maintenance as shown in the table above from IEEE 400.2.

  4. #3
  5. Join Date
    Jun 2018
    Posts
    23
    Reputation
    Quote Originally Posted by Kalbi_Rob View Post
    Click image for larger version. 

Name:	IEEE 400.2 Table 3.png 
Views:	6 
Size:	176.7 KB 
ID:	393

    If the cable is rated for 20kV then I would say 26kV for Acceptance and 20kV for Maintenance as shown in the table above from IEEE 400.2.
    And some of the cable has 6/10 cable rating but operating voltage is 1725 volts. And what is the correct voltage level for this cables?

  6. #4
  7. Kalbi_Rob's Avatar
    Kalbi_Rob is offline Experienced Member Pro Subscriber
    Join Date
    Feb 2018
    Location
    Jacksonville, NC
    Posts
    290
    Reputation
    Quote Originally Posted by changeabilities View Post
    And some of the cable has 6/10 cable rating but operating voltage is 1725 volts. And what is the correct voltage level for this cables?
    One thing I forgot to mention is to be aware of the termination and connected equipment as you should not exceed those ratings also.

    As for voltages to test at, they are all in the table.

    VLF is performed at the cable rating(or limiting component), and tan delta is based on operating voltage to ground.

  8. #5
  9. Kalbi_Rob's Avatar
    Kalbi_Rob is offline Experienced Member Pro Subscriber
    Join Date
    Feb 2018
    Location
    Jacksonville, NC
    Posts
    290
    Reputation
    Quote Originally Posted by changeabilities View Post
    And some of the cable has 6/10 cable rating but operating voltage is 1725 volts. And what is the correct voltage level for this cables?
    Oh, I guess to answer what the test voltage is when it is not on the table, requires a little more investigation on your part as you will have to find the manufacturer data on the cable to determine the test values.

Subscribe

Share this thread

Related Topics

  1. Circuit Breaker voltage ratings
    By nwilliams in forum NETA Level 3 Exam
    Replies: 5
    Last Post: February 12, 2021, 07:54 AM
  2. Most common rated insulation for control wiring
    By E-DivMafia in forum NETA Level 2 Exam
    Replies: 6
    Last Post: December 28, 2018, 08:15 AM
Follow us


Explore TestGuy


NETA Certification Training


NICET Electrical Power Testing


Help and Support




You are viewing the archives. Enjoy new features and join the conversation at wiki.testguy.net