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  1. rand1234

    Transformer Core Ground to Tank Connection - Adding Resistor To Mitigate Circulating Currents

    Hello, hope everyone's day is going well! I have a question regarding the transformer core ground to tank connection. I have heard situations where adding a resistor to the transformer core ground to tank connection mitigates circulating current issues for cores that have unintentional 2nd or...
  2. rand1234

    High-Voltage Air Disconnect - arc horn or no arc horn?

    Hi Everyone, Hope you all are doing well and thank you ahead of time for taking the time to read this post. I wanted to get some feedback regarding arc horn versus non-arc horn design for high voltage air disconnects. Is there any industry standard/norm that dictates when arc horns should be...
  3. rand1234

    Interrupting capability of high voltage disconnects

    Greetings everyone, Hope everyone is having a good day! I had a question regarding interrupting capabilities of high voltage disconnects. Per IEEE 37.30.1, this standard provides you with the ability to conduct calculations to determine the maximum amount of capacitive and excitation/resistive...
  4. rand1234

    Transformer Blast Wall question

    Good Morning, I had a question regarding transformer blast walls. Is is permissible to mount conduit or cable tray on the outer sides of a blast wall? And is there a certain clearance from the Iso-Phase bus duct that must be kept? I can't seem to find any standards regarding transformer blast...

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