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  • Primary Injection Test Pins

    Hello! I have been a part of different testing outfits in the southwest US over the last 15 years, and the shops have always had test pins for doing primary injection circuit breaker testing. I've joined a smaller company and need to purchase some, but I'm having a heck of a time finding them. Would any of you techs have a clue where I could find these? I...

    Posted by CMARTINEZ1029 on 04-15-2025
  • ABB SACE Tmax XT5H

    Hello Everyone, I have an issue with another XT5 breaker. I want to ask if anyone have this alarm before?

    Posted by user62 on 04-11-2025
  • Zenith automatic transfer switch manuals

    I have seen that style ATS a few times, but it’s a rarity. We were a service provider for GE Zenith Switchgear and ATS,’ so I have material on ATS models going back into the late 80’s, but that’s long before then. ABB purchased GE Zenith Controls and your best bet is likely contacting a guy named Quinn in ATS Support. He’s been there for awhile an...

    Posted by Jason_Swenson on 03-29-2025
  • Phase angle analysis course recommendations

    There's a few avenues available but I found Chris Werstiuk gives the best basic explanation at a technician's level (i.e. basic algebra/trig) vs calculus based. You will have to pay for his courses and books but they are well worth it in my opinion. https://relaytraining.com/ To start understanding relays, a great youtube resource are videos from Bill Ander...

    Posted by Kalbi_Rob on 03-27-2025
  • Phase angle analysis course recommendations

    Looking into taking some courses diving into the power triangle, power factor, and phase angle analysis. Teaching myself how to test relays and just want a better understanding of the basics for a lot of the protective functions. Looked online for some courses on phase angle analysis, but didnt see much out there. Any recommendations?????

    Posted by tblanks1693 on 03-27-2025
  • Zenith automatic transfer switch manuals

    Hey everyone, has anyone seen an ATS like this? And can you help find a manual? I can’t find one

    Posted by eric_bunnell on 03-23-2025
  • We Value Your Feedback - Help Us Improve

    Practice question "Which SCADA communication is only appropriate for short distances?" should have RS232 as the correct answer; however, this was marked incorrect with "CAT6" as the correct response. RS232 is a serial, point-to-point communication method only intended for distances up to approx. 50ft whereas CAT6 is typically used with Ethernet communicatio...

    Posted by user987 on 03-15-2025
  • Insulation Resistance Testing Open Circuit Breakers

    Hey everyone, when doing insulation testing on circuit breakers. When I test the breaker open, I typically just go from line to load. And I am not grounded out the other poles In this book, Paul, Gill‘s electrical power, equipment, maintenance, and testing it is saying for circuit breakers open connect high voltage lead to pull one. Ground all other po...

    Posted by eric_bunnell on 03-13-2025
  • Report Tech Quiz Issues Here

    [Transformers] **1. A wye-delta transformer has a primary line voltage of 7200 V and a secondary voltage of 360 V. What is the turns ratio?** *Your Answer: 20:1* Correct Answer: 11.55:1 Help: [What is the turns ratio?]

    Posted by user988 on 03-07-2025
  • RTS Meter Test for SEL-851

    I don't have the SEL-851 in my .mdr database, but based on the issue you're having, I'm pretty sure it has to do with the window position numbers in the METER.TXT read. I haven't figured out yet how to identify the correct number for the position I want except by trial-and-error. If you want to fix it so that you don't have to run manual every time for thi...

    Posted by user987 on 03-07-2025
  • FT Switches - Voltage on blade or not?

    To me, it's about the purpose of the test switch... in my experience, they're mainly used for isolating the relay(s) from the system. If you're planning to test the relay(s) after this isolation, and you would like to use test paddle(s), the tops (stationary terminals) are the only things connected. Makes things way easier to test.

    Posted by user987 on 03-07-2025
  • Restricted Earth Fault Element

    Yes. The main thing to remember for the REF element is the polarizing quantity the respective element needs to operate. For example, REF1 may be from the xfmr neutral CT comparing against one of the High-side breaker CTs. Therefore, you'll need to inject current from each of those CTs in order to properly test the REF element. There is a good REF Test se...

    Posted by user987 on 03-07-2025
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