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  1. safy2004

    24/7 Synchronized generators optimized combination

    Thanks catserving, please see attached the total load and the continuous load details, the fuel is diesel.
  2. safy2004

    24/7 Synchronized generators optimized combination

    Thanks ScottyUK, The company’s condition is to have minimum N+2 generators. But what about the capacity of the generators, what is the best design: ONE 4 MVA TWO 2 MVA FOUR 1 MVA Or there is another option?
  3. safy2004

    24/7 Synchronized generators optimized combination

    It is required is to install generators to feed loads of 2807 kW + j 1621 kVAR = 3241 kVA on 6.6kV, we propose to use 0.4 kV generators and use step-up transformers to feed the loads with 6.6 kV, my question is what is the best combination of generators for this load, is it better to use: 1- One...
  4. safy2004

    Power transformer energization

    Commissioning activities recommended by the factory of the transformer (Prior to HV power energization) a- Measurements • Electric strength of the oil (IEC test): minimum value 60kV, • Winding insulation resistance to ground: at 20°C, The insulation resistance should reach a value of some...
  5. safy2004

    Power transformer energization

    We have commissioned and tested a power transformer 63MVA, 132/33kV, but because of the delay of executing the 132kV source cable we didn't energize the transformer, it's now about one year since our testing, what tests can be done before energize the transformer? Keeping in mind we have done...
  6. safy2004

    IEC ?? equivalent

    Hello, I have a question if there is IEC standard that is equivalent to (or similar to) the IEEE std 1366. This standard concern the power distribution reliability indices. Thanks in advanced for any help. Regards, Safy
  7. safy2004

    Current Transformer Series Connection

    Regarding the parallel and series connection of CT's: Secondary of the CT can be considered as CURRENT SOURCE! Connecting two CT'S in parallel means two current sources outputs connected to the load, which means the result is the algebraic summation of the two secondaries of the CT's i.e: If...
  8. safy2004

    IEEE std 1366

    Hello, I have a question if there is IEC standard that is equivalent to (or similar to) the IEEE std 1366. This standard concern the power distribution reliability indices. Thanks in advanced for any help. Regards, Safy
  9. safy2004

    Power factor correction - over compensation

    Hello, A poor power factor can be improved by adding power factor correction capacitors to the plant’s distribution system. Correction capacitors provide needed reactive power (kVAr) to the load. If some thing happened by an Inadvertent mistake, and the compensated reactive (capacitive) power is...
  10. safy2004

    Cable filler

    Thanks 7anoter4 But from commercial point of view EPR filler is more expensive.
  11. safy2004

    Cable filler

    Hello Thanks in advanced for any feedback. We are planning to use new 3x150mm2, 33kV cable, and we are trying to identify which cable is better than the other? Regarding the filler of the cable, I have noticed that there are two different types of those fillers,one is compact paste(dough), and...
  12. safy2004

    MV Switchgears clearance

    According to IEC, what is the minimum clearance between the top of the MV switchgears and the roof of the building.
  13. safy2004

    Testing laboratory

    We intend to buy new testing equipments to our laboratory for electricity distribution network. Can anybody help me to select what suitable testing equipments to identify the accepted technical specifications for: 1- Porcelain insulators. 2- M.V XLPE cables. 3- L.V P.V.C cables. 4- Aluminum...
  14. safy2004

    Transformers Drying equipment

    Hi! every body We intend to establish workshop, for repairing and maintenance of distribution transformers, and regarding the drying equipment we got different offers from the suppliers including different kinds of drying equipment: 1- Pressure-changed Vacuum Drying Equipment. 2- Hot Air...
  15. safy2004

    MV Power cables armor

    Thanks Bilegan But you have mentioned this phrase: "All armoured cables are suitable for direct buried installations" Is it mentioned in the standards, or it's just a conclusion? Regards Safy
  16. safy2004

    MV Power cables armor

    Hi! Every body We want to use power cable 33 kV, XLPE,single core 1x400 mm2 to feed one substation outside the city, its long is about 6 kM, this cable will be buried under ground, it will be direct laid, blinded with cable laying sand 750mm. My question is there any relation between the armor...
  17. safy2004

    11 kV double circuit transmission line

    Hi every body! Dose any one has information about the double circuit 11 kV transmission over head line? what are the dimensions of the poles and what is the clearance between the phases? Thanks in advanced for any help Regards, Safy
  18. safy2004

    Vector group selection

    Thanks, david and scotty! But if there is no relationship, why sometimes YNd1 is used and other times YNd11. Is it just standard or there is any other reason for using different vector groups in different transformers.
  19. safy2004

    Vector group selection

    Hi.. every body! we want to install new power transformer, but we have problem. My question about vector group. Is there any relation between the vector group and short circuit current. one engineer told me that if I want to use the power transformer in area near the generation, I sould select...
  20. safy2004

    Power transformer insulation test

    Thanks prc your informations are valuable

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