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  • Users: AKassem
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  1. AKassem

    Specification of the silica gel used in Transformer Breather

    It there any standards or specs. for the silica gel used in the transformer breather ( ranges 2.5-5 MVA) such as size (in mm or mesh), shape ( spherical , ... ), water absorption capacity , loss on drying , ... There are many products/manufacturers of blue indication silica gel. Which one...
  2. AKassem

    Tranformer assessment and Life extension

    We have a 25 MVA - 66/11KV ONAF transformer which has been working for more than 20 years Now we have to operate the transformer at around 14 MVA ( 56% )only to avoid over temp. trips My question here is : 1) How to make an assessment for the current status of the transformer and estimate the...
  3. AKassem

    ABB LV distribution boards drawings ??

    Does anyone has autocad drawing (dwg or dxf) of ABB LV distribution panels (Protecta , Unikit, Minicenter, Mirage ,...) ???
  4. AKassem

    Accebtable earth resistance values

    Dear All , 1) What is the maximum acceptable earth (ground) resistance for intrinsically safe IS instruments and for non intrinsically safe instruments NIS?? 2) what is the maximum earth resistance for grounding a PLC and DCS sytems according to standards ? as i know that for other electrical...
  5. AKassem

    Allowable earth resistance limits

    Dear All , 1) What is the maximum acceptable earth (ground) resistance for intrinsically safe IS instruments and for non intrinsically safe instruments NIS?? 2) what is the maximum earth resistance for grounding a PLC and DCS sytems according to standards ? as i know that for other electrical...
  6. AKassem

    Armour Earthing & Metallic Screen Earthing

    Dear all, Please provide help in these questions ? What is the reason of earthing the armour? What is the use of metallic screen in HV & MV cables,and why it is earthed & why not used in lv cables? What is the use of conductor screen (placed directly over the conductor) & (insulation screen...
  7. AKassem

    Min. Time bet. Motor Starts

    Hello Every Body , I'm facing a situation of too much motor starts per day for For Siemens LV Motor, 75 KW , 3000 rpm , 400V on an Air Compressor Application .. What is the minimum allowed time between DOL motor starts ( or the mumber of starts per day) to protect the motor and the contactor...
  8. AKassem

    Transformer Breather

    For me , I know that the function of the oil Transformer Breather is to prevent water vapour from entering inside the Transformer by using silica gel & prevent dust or soild particles from entering by using some transformer oil in the Breather cup .. In my case I noticed that the oil level...
  9. AKassem

    Special Motor's Data

    On a special EX canned pump Motor , I Found some data on the motor's name plate which is not clear for me such as : PN = 50 & tE = 12 s Any body knows the meaning of these ratings ? Thank you for you help ,
  10. AKassem

    Cable Laying

    What is the difference between 1-laying cable direct in ground 2-in a trench 3-PVC sleeve 4-Conduit 5-Pipe 6-Duct bank
  11. AKassem

    Switchgear

    What is the difference between 1-Single Front Switchgear 2-double Front Switchgear 3-Back to back switchgear

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