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  1. 341968

    HIGH VOLTAGE EQUIPMENT DISCHARGE IN HAZARDOUS AREA ZONE 2.

    We have Desalter unit in our plant. When it is off line and available for maintenance. I want to discharge the positive and negative electrodes (within the vessel) to ground, for safe working on bushing entrance assembly. My question is does this comply with NFPA standards or any other...
  2. 341968

    Fuel Gas Heater operated by thyristor control panel causing fluctuating on feeder Ampere

    Dear Gents, We have following thyristor control panel from CD Automation srl MULTIDRIVE-3PH Thyristor Unit 1100A – 1400A 1700A-1900A-2100A It is operating to a fuel gas heater (manufactured by Fati srl. 400V, 50HZ, 700KW, 1011.6A). It is working perfect. only the problem we are noticing...
  3. 341968

    Neutral Connection For Balanced Load

    Thanks all for your technical expertise shared. Please see attached report I have finally submitted. Client intension to go with Inverter option. Kindly advice how much watt inverter would be enough for spring charging motor of ACB. I have proposed 1000W I believe it very much...
  4. 341968

    Neutral Connection For Balanced Load

    Here page 16-17-18/21https://files.engineering.com/getfile.aspx?folder=dc440258-52d1-4d35-a711-b78a11c3bed3&file=SOM5464753_MCC_PANEL_SINGLE_LINE_DIAGRAM.pdf
  5. 341968

    Neutral Connection For Balanced Load

    No, you should NOT connect any load to the Board Neutral bar, even the utility Neutral is earthed. Take note that (in this case) there is No connection between the utility Neutral to the Board Neutral, which is "floating" and is isolated from earth. Che Kuan Yau AGREE Please see attached pdf...
  6. 341968

    Neutral Connection For Balanced Load

    Thanks Kiribanda for your important highlights, Thanks to all Gents who benefited me with their professional expertise.The concept is very clear and i will implement accordingly. Thanks a lot. Stay blessed
  7. 341968

    Neutral Connection For Balanced Load

    Thanks Che Kuan Yau for valuable input.
  8. 341968

    Neutral Connection For Balanced Load

    Yes thanks David, I can install one Control/Auxiliary Transformer 400/230Vac on the incoming of the ACB. On the Name Plate of Panel it is mention it as external supply from ups. But all these external supplies are far apart and not so feasible to arrange. But What are the other potential...
  9. 341968

    Neutral Connection For Balanced Load

    Okay our actual problem is we do not have 230Vac in main panel to charge spring charging motor of ACB. From Transformer no Neutral is coming to main panel. So what are doing manually charging the spring. And we have faced some problem doing so. So I decided to bring Neutral from transformer to...
  10. 341968

    Neutral Connection For Balanced Load

    Could you please guide me that I have LV transformer Star connected. Only 3-phase are going to panel. Star point(Neutral bus) of TR is only solidly grounded. Panel has neutral bus BUT empty (No cables), No Ground. Reason not being using Neutral is completely balanced load (4-Motors DOL and...
  11. 341968

    CORROSION IN ELECTRICAL CONNECTION BOX

    Assembly Drawinghttp://files.engineering.com/getfile.aspx?folder=55f478c5-e88b-4604-878c-0941305a6b2d&file=REGENERATION_HEATER_CONSTRUCTION_DRAWING.pdf
  12. 341968

    CORROSION IN ELECTRICAL CONNECTION BOX

    Dear ScottyUK, Thank you so much, you have proposed one of very good solution. We will sure look into it deeply and see its implementation. for me it is new indeed. Thanks again. Attach here with two technical...
  13. 341968

    CORROSION IN ELECTRICAL CONNECTION BOX

    Dear EdStainless, Thank you for your expertise and recommendation. You technical assessment is very right. Due to assembly constraints, we have no choice to replace the bolts, but we will ask manufacturer to send us new heaters with copper alloy/bronze bolts. We will ask manufacturer to give us...
  14. 341968

    CORROSION IN ELECTRICAL CONNECTION BOX

    AMBIENT CONDITIONShttp://files.engineering.com/getfile.aspx?folder=d7151925-407d-4839-ab31-6e5363df7874&file=AMBIENT_CONDITIONS.jpg
  15. 341968

    CORROSION IN ELECTRICAL CONNECTION BOX

    PHOTO-2http://files.engineering.com/getfile.aspx?folder=3038cc1d-a62a-4949-93e3-9891e66d0437&file=photos-2.jpg
  16. 341968

    CORROSION IN ELECTRICAL CONNECTION BOX

    PHOTO-1http://files.engineering.com/getfile.aspx?folder=bd16153b-5c9f-4605-8d61-e188e5b87160&file=photos-1.jpg
  17. 341968

    CORROSION IN ELECTRICAL CONNECTION BOX

    Dear All, We have two Regeneration Heaters at our Nitrogen Plant, one stay in operation and the other in stand-by mode.these heaters are used to heat waste Nitrogen above 200 deg.C and exhaust into the atmosphere. We opened Electrical Connection Box of the one heater(Already in stand-by mode...
  18. 341968

    IS THIS MOTOR FAILURE OR PROTECTION FAILURE

    Dear LionelHutz, Thank you for this clarification, well understood. Also i am thankful to all participants in this thread and their professional support. I believe when you are good to others, you are best to yourself. I will remember all you guys goodness. I have submitted my final report. Will...
  19. 341968

    IS THIS MOTOR FAILURE OR PROTECTION FAILURE

    Dear panter (Electrical), You are very right. Today our motor specialist open bearing upon my request. He removed the seal cover. He found small particles. flashed from winding and overheated greece. It was causing bearing hard. He cleaned the bearing and it become like a new. So it is confirmed...
  20. 341968

    IS THIS MOTOR FAILURE OR PROTECTION FAILURE

    Dear LionelHutz (Electrical), I have two suspects here. I found 37-KW motor Non Drive End Bearing was not free;y moving, as if some of its ball is damaged. it had a big friction at one place while rolling with hand. seems bearing damaged. It might have caused sudden high current melting of one...

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