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Recent content by jhonwyn73

  1. jhonwyn73

    Seeking support for insulation gasket alternate material

    Thanks for the message, other has been deleted.
  2. jhonwyn73

    Seeking support for insulation gasket alternate material

    Thanks for the response. Yes, CS is used at one side. we got a comments that 347SSRJ may causes corrosion specially at CS side, and I am looking for alternative.
  3. jhonwyn73

    Alternate gasket as replacement for insulation one

    Greetings, I am seeking support for a quench line gasket for 3 inch TCV, following are the information and looking for suitable gasket for this application. The 6 inch quench line is having TCV which is SS material (A182 F321 Flange) and the line is CS material, at present the insulation...
  4. jhonwyn73

    Seeking support for insulation gasket alternate material

    Greetings, I am seeking support for a quench line gasket for 3 inch TCV, following are the information and looking for suitable gasket for this application. The 6 inch quench line is having TCV which is SS material (A182 F321 Flange) and the line is CS material, at present the insulation...
  5. jhonwyn73

    Problem: High cable sheath current for 34.5kV distribution system

    Many thanks to all for the helpful information and advise. But the unbalance in the sheath current is really strange. The sheath current for two phases = 75A/phase, while for the third = 95A. Is there any explanation for that?
  6. jhonwyn73

    Problem: High cable sheath current for 34.5kV distribution system

    Many thanks for the fast response. Can you help for standard reference? This will help to convince others and expedite the corrective action.
  7. jhonwyn73

    Problem: High cable sheath current for 34.5kV distribution system

    Greeting, In 34.5kV distribution system, the cable distance between 34.5kV CB (upstream) and 34.5kV/13.8kV transformer is about 300meter. Unfortunately, each phase (single core cable) has high sheath current (AWA current = 100A for B, 80A for R&Y). Cable is single core 500mm and at terminals the...
  8. jhonwyn73

    Selection Between Single Breaker System & Double Breaker System

    Greeting, We have a plane for a distribution substation 34.5kV. We got two proposals as follow: 1) To use single bus (no sections), and all CBs will be double due to high current demand that normally will exceed 4000A. the max widely used CB found in the market for this level is 3150A. This bus...
  9. jhonwyn73

    References for Plant Network and PLC's for Fresh Eng.

    Dears, I have been assigned to handle a networking and PLC project, and I am in lake of knowledge in this filed. This project will include the followings: 1) PLC's for Thin Slap Mill (small steel plant). 2) Level: 1,2,3,& 4 (SAP or Oracle). I would highly appreciate if you can share with me...
  10. jhonwyn73

    Autotransfomer standard sizes & ratio

    There is an idea to have an Autotransformer of 500MVA 380/34.5kV. But we want to avoid the none standardized sizes/ratio(HV/LV). Appreciate your help to know if such ratio (380/34.5kV) is widely used. Also, please help to know some references for the standard sizes & ratio, worldwide. Thanks...
  11. jhonwyn73

    The Use of Cable to Link Two Bus's directly in a MV Distribution Subst

    Greeting to All, We have an expansion, and there is a plan to supply a new 35kV bus directly through a cable from an existing 35kV bus. The distance is about 20m and the demand is about 30MVA. So, both bus's will be connected directly through a cable and two CB's (no transformer). It is a new...
  12. jhonwyn73

    Power Factor vs. Consumption Invoice

    Hello Everyone, I have a query regarding the monthly invoice vs. power factor for industrial complex. The electricity provider accepted a power factor of 0.85 lagging at the connection point. The charging tariff will be for watt only, and at a fixed rate regardless of peak time… etc. The...
  13. jhonwyn73

    MV Standard Levels

    Dears, Many thanks for your help. I have gone through ANSI C84.1-2006 & IEC 60038 ed7.0 (2009-06) and both were very helpful in addition to your above valuable comments.
  14. jhonwyn73

    GIS vs. Air insulated MV Substation (pro & cons)

    Greeting, For a new 34.5kV substation 60Hz, we have two proposals, GIS and Air insulated. I would appreciate if you can help to have a comparison that shows the pro & cons of each. At present, I am thinking for the following: 1. The %( d$) of the Initial cost between the two options (we will...
  15. jhonwyn73

    MV Standard Levels

    Many thanks for your valuable comments. The plant will be in United Arab Emirate(UAE), and majority of equipment will be from Europ, Japan, and Asia with 60hz power system. I want to avoid the issue that has been highlighted by Mr. oldfieldguy, thus, we are looking for standardization, and we...
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