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  • Users: fredpar
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  1. fredpar

    SMU/NX to Bay-O-Net coordination

    For medium voltage [13,2KV] underground distribution which type of fuse coordinate better with the Bay-O-Net type? SMU-20 50Amps or NX-50? Let's say I'm 2 to 3 miles away from the sub. Thanks!
  2. fredpar

    Voltage problems/Block Plant

    Hi: I got a call from one of our customers complaining about voltage spikes that are burning electronics and machines. It's a Block plant [CEMEX], we have a 500KVA transformer to feed them at 480/277V. They say voltage goes up to 530V even 580V. They have their own dry type xfmr to feed drives...
  3. fredpar

    Wye-Delta bank susceptibles to burnouts?

    Hi: I was told that closed Wye-Delta banks are prone to burn-outs on primary faults. Can you explain me why and how to avoid this?. [I'm closing an open wye - open delta bank, 25 and 50 kva, adding a 25 kva to avoid complaints for unbalanced voltages] Thanks!
  4. fredpar

    Bad Power Factor

    We are a small/medium size utility company (60000 customers) with some customer with bad power factor(i.e.: 0.6, 0.8). What can we do to fix this other than charge them for KVAR? Thanks in advance for your ideas!

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