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  • Users: ee_123456
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  1. ee_123456

    Relay Electromechanical Reset

    Hello All, All the relay vendors have "Electromechanical reset" or "instantaneous reset" on their protective function reset curves. GE Says "use when coordinating with other Electromechanical devices". SEL says "use when there is an upstream electromechanical device". My question is, what if...
  2. ee_123456

    Why do faults result in an arc on high-voltage systems?

    Hello All, I am a young engineer trying to wrap my head around arc flash protection within substations. Here is a simple hypothetical. Say you have a 138 kV 3-phase breaker with the following spacing: Phase-phase = 6 foot Phase-ground = 7 foot Now if you got a jumper (let's be theoretical...

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