How to Test Breakers ep2: Medium Voltage Vacuum Circuit Breaker

4,295

139 0

Published 2023-06-21

In this video I run through all the required NETA MTS tests to perform maintenance on a 5kV Medium Voltage Vacuum Circuit Breaker.

0:00 Intro
3:32 Visual and Mechanical Inspection
7:42 Manual Operation
8:22 Electrical Operation
10:28 Contact Timing Test
15:10 Insulation Resistance Tests
17:01 Contact Resistance Tests
19:10 E-Gap (Contact Wear Measurement)
20:45 Vacuum Integrity (Hi-Pot/Overpotential)
28:54 Lubrication and Final Thoughts

Background music from: freelofi.com

All Comments (14)

@smadusnk 28 days ago

Quality stuff.Thankyou very much 🎉
@BurRun-kt3tf 14 days ago

Thanks អរគុណ❤
@southernstaffing 5 months ago

Thorough, but easy to follow! Thanks for sharing!!!
@bspdm4954 1 year ago

Dude, thank you for these videos....and please keep them coming. Please perform standard NETA MTS testing on a medium voltage contactor, including gap and wipe measurements. :)
@soe2152 3 months ago

Great content again. Really enjoy it, thanks for sharing your knowledge. Waiting on new Relay series...
@khalidjxbify 11 months ago

Very informative and easy to follow video. Expecting to test a MV breaker very soon. Please make more videos. As always, you are a wealth of knowledge !!
@nickvalle1852 4 months ago

Would be really nice to see how to test Ground fault on the breakers
@SB-dc9qb 4 months ago

Excellent video! Thank you
@craytonzaragoza3479 4 months ago

good stuff, could you show more on how to hook up the leads
@gerardwalsh6215 3 months ago

Great video 👍
@freepalestine9685 1 month ago

Great Job and it is nice work..... but I have a comment, I think when you do the Hipot Test you have Two ways to test it first one is by closing the CB and taking every single phase with earthing another phase. the second way is by opening CB and shortening the top boles and applying High voltage by earthing the below Boles. if you see something that I cannot see tell me Please and thank you for this information
@wyattredding5529 4 months ago

I use a HVI VLF-65E test set would you have settings on a VLF system? It has only a hot test lead and ground.
@jessewilliamson728 1 month ago

I like what you're trying to do with simplifying the hipot test and it does work for bottle integrity but it would not be an acceptable test for phase to phase or phase to ground as your method never actually energizes the load side of each phase. Standard practice from what I have learned is breaker open applying voltage line to load for each phase in guard mode for bottle integrity, then breaker closed applying voltage to line/load of one phase in ground mode with other phases shorted together and to frame, ground lead stays on frame the whole time, return lead is on load side for open pole and shorted phases for closed pole tests. Make sense?