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  • Users: anggap
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  1. anggap

    Autotransformer Zero sequence current

    Hi all, Recently there was single line to ground fault in my plant, below is the current based on the actual record on related relays: * TR1 and TR2 LV winding are connected to ground with low resistance NGR (1000A * Neutral point of generators are connected to ground with high resistance...
  2. anggap

    Relaying Accuracy CT's

    Hello, In my plant there is a 34.5 kV feeder that supply very far but light load (current parameters at supply feeder: V = 34 kV, I= 21 A , PF= 0.06). The feeder use C100 CT's ( multi-tap CT 100/5) and ION 7300 to measure the load. I found out that whenever the load was disconnected, PF reading...
  3. anggap

    Differential Trip on Transformer

    Recently, one of my oil filled transformer 13.8/4.16 kV, 5 MVA tripped by 87T (GE SR-745 Relay). This transformer worked in parallel with another identical 5 MVA transformer. Relay's event record and phasors strongly indicated that there was single phase to ground fault in phase B LV side...
  4. anggap

    Calculating R and X cable for LDC using actual measurement

    Hi All, I am trying to calculate LDC setting for a voltage regulator 34.5 kV that supplying a bus in radial, this voltage regulator connected to receiving bus using a 123,000 ft length subsea cable. The problem that I can't find the cable specification since it is an old facility. Is it...

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