This video will show you how to look at relay specifications and interpret them.
Click “Mark Complete” below after watching the video so you can keep track of your progress.
Introduction to Relay Testing
16 Topics
Isolate the Relay from the System
2 Topics
Connect the Test-Set to the Relay
3 Topics
Upload the Relay Settings
2 Topics
Perform an Acceptance Test
5 Topics
How to Test Protective Elements
17 Topics
Perform a Commissioning Test
9 Topics
Perform Maintenance Tests
5 Topics
Post Testing Tasks
4 Topics
Hi Chris, with regards to absolute & relative error. Is it an accepted practice to always choose the larger error? Is this the algorithm employed in modern test sets to decide on an assessment of any test result?
If you are using rule-of-thumb evaluations, yes.
If you are trying to match manufacturer specifications, you will have to match the manufacturer. For example: SEL usually add the absolute and percent specifications and GE usually specifies whichever is greater.
Don’t forget to include the test-set specifications in your calculations if you are trying to mimic the manufacturers.
Also remember to add the contact closing time for timing tests if it is not included in the specifications. For example: SEL specs typically don’t include the contact closing time. GE relay typically do include contact closing time.
Thank you Chris, this is very useful.