What are we testing with the Slope test?
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Junior Member
Posted August 17, 2020
What are we testing with the Slope test?
Junior Member
Posted February 8, 2021
How little current your test set can output?Originally Posted by Js20981
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.
