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  1. 11basonia

    AN ARC FLASH PROTECTION

    In an ARCING CURRENT CALCULATIONS THERE IS A FORMULA USED TO MANUALLY CALCULATE ARCING CURRENT WHEN GIVEN BOLTED CURRENT,CABLE GAP, ETC.THE FORMULA IS : IgIa= 0.00402+0.983*IgIbf 1.What is Ig in this formula and what is the simplified formula to calculate Ia ( arcing current)? I have been...
  2. 11basonia

    AN ARC FLASH PROTECTION

    Can someone help with the formulas to calculate the following: 1. arc current 2. incident energy and 3. flash protection boundary the system fault level is 16KA @ 11kv Regars, Basonia
  3. 11basonia

    POWER TRANSFORMER PARALLEL RUN & VECTOR GROUP

    1.On power transformer vector group of DY11(-+30 DEGREE PHASE SHIFT),BETWEEN WHICH QUANTITIES DOES THIS PHASE SHIFT EXIST? OR IS IT BETWEEN THE PRIMARY AND THE SECONDARY VOLTAGES OF THE TRANSFORMER? CAN YOU CLEARIFY THAT FOR ME?
  4. 11basonia

    POWER TRANSFORMER PARALLEL RUN & VECTOR GROUP

    WHAT ARE MOST IMPORTANT THINGS TO REMEMBER ABOUT VECTOR GROUP OF TRANSFORMERS,WHEN WE NEED TO RUN THEM IN PARALLEL? E.G DY11 TRF AND DY1 TRF.I HEARD IF VECTORS GROUPING OF TRANSFORMERS IS IGNORED, THERE IS A RISK OF CREATING SHORT CIRCUIT.
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