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Explanation of ANSI #51 time overcurrent relay TCC curves: definite time (CO-6), moderately inverse (CO-7), inverse (CO-8), very inverse (CO-9), and extremely inverse (CO-11) for the Power PE Exam.
0:21 - Introduction
1:50 - Time dial setting and time delay curve type
2:26 - log scale for multiples of pick up and time axis
4:30 - What an inverse time curve means
5:10 - Difference in trip characteristics between different inverse curve types
8:26 - "CO" means a change over relay
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