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  1. vetlover

    IEEE 67 directional overcurrent protective relay issue

    The site is 7 years old and this has been occurring for only about 3 months. The Basler has been removed and tested. Unfortunately, the reporting on this relay only logs about 18 events and when we download it, they are all either 27s for the undervoltage which starts the gens or else they are...
  2. vetlover

    IEEE 67 directional overcurrent protective relay issue

    Greetings forum misters! Wanted to see if somebody might ponder an issue I am seeing at a customer's data center. I am getting an occasional and inconsistent target 67 trip of a Basler BE-951 protective relay that is tripping a 3000amp 480v main breaker. We initially saw the target when the...
  3. vetlover

    VFD causing disturbance for Stand-by generator

    Bill, Thanks for your response. There is not a PMG> There are (2) 10HP motors. I do not presently have the settings, but understand your ramp concern. I can say that the voltage is not proportional, it is acutally fluctating both up and down during the speed build up. I think I see where...
  4. vetlover

    VFD causing disturbance for Stand-by generator

    Gentlemen, I have an issue with a Yaskawa VFD (480v) and a new stand-by generator. When the VFD is starting the blower motors on HVAC units, the generator is sending wide voltage swings and even causing generator engine speed disturbance. I am thinking the generator may be undersized...
  5. vetlover

    MV 4160v motor imbalance protection

    Gentlemen, I have new information. The original issue was resolved in a wiring problem, but there is one issue left. On occasion, there are rectifiers being shorted in the motor VFD. This is a Toshiba unit,900hp compressor, 4160v with a 1.15 SF. I found a recloser on site with the...
  6. vetlover

    MV 4160v motor imbalance protection

    I appreciate your response. I will be visiting the site the first week of December. Please look for my update when I return, I will try to answer your questions. I really appreciate the consideration. The one confirmation I can make is that a small coal mine has come on line below it. I am...
  7. vetlover

    MV 4160v motor imbalance protection

    I am in search of some form of conditioning/protection that may assist in cleaning up a voltage imbalance being incurred on a medium voltage 4160v motor starter. There is an additional load on the incoming power from downstream that is causing phase imbalance enough to vibrate and burn out...
  8. vetlover

    Generator terminology

    I am trying to differentiate between an ac generator power factor rating and the impedance of the generator to answer a specific question. If somebody is asking the impedance of a generator, what would they be looking for exactly.
  9. vetlover

    harmonics noise advisement

    Gunnar, I have sent drawings-Thursday afternoon. Thanks for your view. Vetlover
  10. vetlover

    harmonics noise advisement

    Gunnar, Thanks for your response, I should have readings by Wed. evening and will send to you then. I will explain situation more in detail at that time. Vetlover
  11. vetlover

    harmonics noise advisement

    Need to see if someone can suggest a person or organization that can take a look at charting from hioki power analyzer that may make suggestions as to a solution for problem. DC plating process is interfering with upstream AC equipment.
  12. vetlover

    harmonic issues? arcing ice cube relays!

    Issue at hand, preparing for Hioki harmonics study, but thought I might ask. 2500 amp 480v 3phase service entrance straight to an MDP that feeds an 800 amp breaker to a sub-panel. There has been addition of plating apparatus at sub panel, requiring 480v feeds to full fledged rectifiers for...

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