×
Follow Us
Results 1 to 2 of 2

Differential Slope 1 and 2

    #1
  1. Join Date
    Jul 2020
    Posts
    7
    Reputation

    Differential Slope 1 and 2

    What are we testing with the Slope test?

  2. #2
  3. Join Date
    Nov 2019
    Posts
    11
    Reputation
    Quote Originally Posted by Js20981 View Post
    What are we testing with the Slope test?
    How little current your test set can output?

    Seriously though, in a modern (digital) relay you are testing the settings (Slp1, Slp2, breakpoint between). The slope 2 is there because on a through fault, the CT's can misbehave and not supply accurate replicas of the primary signal. The larger % on slope 2 allows for greater mis match at current levels associated with a through fault. Slope 1 (on a Tx) is allowing for tap changer operations (+/-10 %).

    It is just as important that the relay restrains for a through fault as well as it tripping for an internal fault.

Subscribe

Login or register to leave a reply!


Share this thread

Related Topics

  1. Replies: 3
    Last Post: April 6, 2020, 08:54 PM
  2. Field test procedure for Modified Differential Ground Fault systems
    By Biscuit in forum Electrical Testing Talk
    Replies: 3
    Last Post: January 13, 2016, 01:39 AM


Related Content


Follow us


Explore TestGuy


NETA Certification Training


NICET Electrical Power Testing


Help and Support