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  • Primary Injection Test Pins

    Any Machine shop should be able to make those. Our shop in the northeast has had them made a few times.

    Posted by DavidBasile on 08-04-2025
  • Application of TTR Test Voltages?

    From the test: From the material: Conversely, from Megger: My understanding of the topic was that we wanted to excite the HV windings in order to minimize the generated voltage; applying 100 and making 25 is much safer than applying 100 and making 400? Any insight would be appreciated.

    Posted by Aeoleone on 08-04-2025
  • Low power factor can be corrected with the use of?

    From the reference material: I feel like this might be a phrasing of the question problem? I understand that a leading or lagging power factor can require capacitors or inductors to correct, but I'm used to people referring to too much inductance as the 'low' power factor.

    Posted by Aeoleone on 08-04-2025
  • Insulation Resistance Test Connections?

    Huh, today I learned. Thank you!

    Posted by Aeoleone on 08-04-2025
  • Insulation Resistance Test Connections?

    I think the key here is *"on equipment 600V or lower"* Its not uncommon to find testers rated for 600V without a guard terminal, only Positive (+) and Negative (-). The reference material could probably use an update to make this more clear.

    Posted by SecondGen on 08-04-2025
  • Insulation Resistance Test Connections?

    From the cited reference page: Is there something I'm missing?

    Posted by Aeoleone on 08-03-2025
  • Megger SPI Test Set Opinions

    We ended up renting one a couple months ago. It is not a terrible test set, especially when brand new (Like the one we got). However its got a learning curve, and requires a computer to operate (No manual vernier like the ETI test sets). My biggest issue with it isnt how good it is (it feels great), its actually when shipping it to a job. If someone straps i...

    Posted by deviatedfuse on 07-30-2025
  • Which IEEE trip curve would produce the longest trip time given the relay information below?

    Even the given reference picture clearly illustrates C-11 / extremely inverse as the 'slowest' trip curve, per multiple of pickup current - which makes sense to me, as it has the most inverse relationship with the multiple. Can anyone offer any insight, here?

    Posted by Aeoleone on 07-29-2025
  • Insulation Quality: The Five Key Causes of Insulation Degradation

    Insulation is a critical component in electrical systems, designed to prevent unwanted electrical current flow and ensure safe, reliable operation. However, insulation begins to degrade as soon as it is put into service. Over time, various factors can cause insulation to wear down, leading to reduced performance and potential failure. In this article, we ...

    Posted by TestGuy on 07-29-2025
  • Transformer Cooling Systems and Methods Explained

    thank you for information

    Posted by user132 on 07-27-2025
  • Megger SPI Test Set Opinions

    Looking to get some feedback if anyone has used the newer Megger SPI 4000 and or the SPI 500 for primary injection on LV Circuit breakers. My shop has an ETI PI-6000 (bitch to move around the city) an ETI PI-1600 ( which likes to sit in the shop and break out in the field) and 2 Megger SPI225's I've started looking at possibly getting a Megger CB-845 to fre...

    Posted by Joseph_Darragh on 07-27-2025
  • How primary and secondary phase verification is accomplished.what equipment is required

    Morning everybody I am in a relay class. I need help understanding how primary and secondary phase verification is accomplished. What equipment is required? I just need help having a better understanding of it.

    Posted by eric_bunnell on 07-24-2025
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