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  • Users: txg84
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  1. txg84

    TVSS on UPS output

    Sibeen, the UPS at this building failed a couple months back. The SCRs for static switch failed while the UPS saw an overload condition. The UPS could not transfer power to bypass and shutdown. The SCRs were replaced but the cause of the failure was never determined.
  2. txg84

    TVSS on UPS output

    Ghostbuster7: If by on-line you mean that the output power is normally in-line with the rectifier and inverter, then yes the unit is a full on-line unit. Also, I have checked the log file during the time frame that the Drantez recorded the current spikes and have not seen anything. I was...
  3. txg84

    TVSS on UPS output

    There are no static transfer switches fed by the UPS. The UPS should have transfered to bypass or shown some type of overload condition when these spikes occured, but there is nothing on the UPS log. This is why I am leaning towards the spikes being caused by the UPS.
  4. txg84

    TVSS on UPS output

    There was no voltage transient shown in the data. The UPS feeds servers and computers. None of the breakers tripped and they did not have any damage to equipment. I do not have any idea what might be causing the current spikes. Has anyone had experience with TVSS units "operating" under normal...
  5. txg84

    TVSS on UPS output

    On of the building on the campus has been having issues with it's UPS. I decided to install a Dranetz on the output of the UPS to monitor it. The UPS is 225kVA, 480V Input 208Y/120V output. The load on the UPS is about 200A but there have been current spikes at diffrent times. The first spike...
  6. txg84

    Main Bonding Jumper`

    The distribution system as well as the building is owned by the government. There is a meter for each building located on the transformer. Would bonding at the transformer prevent objectionable currents from occurring?
  7. txg84

    Main Bonding Jumper`

    The transformer feeds two separate buildings. Originally there was a circuit breaker installed inside the LV compartment of the padmount transformer, which fed one of the buildings. At some point the breaker was removed and the conductors were connected directly to the transformer. I'm guessing...
  8. txg84

    Main Bonding Jumper`

    Is there a reason why the code allows bonding at the transformer or the first disconnecting means for a SDS but not for a service?
  9. txg84

    Main Bonding Jumper`

    I was inspecting a 13.8-208/120V pad-mount transformer that serves two separate buildings. The equipment grounding conductors and the grounded conductor(1 for each building) are all bonded together at the transformer. Each building is fed by 3-phase conductors, 1-grounded conductor, and...

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