ANSI #51 Time Overcurrent Relay inverse time current curves TCC explained (ELECTRICAL POWER PE EXAM)

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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[@Boldaslove71]

I remember testing a very old CO relay about 25 years ago. Right on the nameplate, it said Type Circuit Opening relay, or something similar. I remember this because of all the CO's I've tested over the years, I now understood the name. The old one had a heavy glass cover, similar to a Pyrex baking dish. The nameplate also had the TCC right on it.

[@electricalpereview]

that's really neat, thanks for the share!

[@puthyx]

You're the best in the business Zach, you let me easily pass my PE exam my very first time!

[@electricalpereview]

Thanks Bill! Good to hear from you

[@electricalpereview]

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

[@user-lh5uj8vb7b]

Just in a knick of time...saviour wheres the part 2?

[@KingFreakazoid7]

You are a king

[@electricalpereview]

Thanks Adam! Glad you found it helpful

[@aaroncurry6281]

Still the best

[@electricalpereview]

Thanks Aaron!