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  1. J

    Electrical Check Lists - Engineering Phase

    Does anyone have that type of check lists that can share. Thanks
  2. J

    Safety switches/local isolator Switches NEAR ELECTRIC MOTORS

    Is not usually to install NEAR each electric motor a safety local switch. May be for special case like conveyors or similar. In case that we have for example 1000 electric motors are needed apart of CB install upstream a local switch device? Any IEC standard with that OBLIGATION?
  3. J

    Directly from 30 kV to 0.4 kV? Or step down the voltage in stages, typically from 30 kV to 6 kV, then from 6 kV to 0.4 kV.

    In most cases, it's standard to not go directly from 30 kV to 0.4 kV. The more common practice is to step down the voltage in stages, typically from 30 kV to 6 kV, then from 6 kV to 0.4 kV. Any advantages (economical, technical) of it? Attached example.
  4. J

    UHV/EHV Cables in aerial rack distance to Coke/Blast Furnace Gas

    Is there any standard that refers minimum distance between UHV/EHV Cables and Coke/Blast Furnace Gas? Any EMC study must be done?
  5. J

    Maximum transformer rating/circuit breakers in parallel configuration - 2nd round

    For MV voltage level (36 kV) the maximum nominal current for CB are: 2500 A 3150 A (forced ventilation) Nowadays there are still the same values or bigger values can be found? Where?
  6. J

    EHV/UHV GIS Expansion from Existing One

    Does anyone has experience in EHV/UHV GIS expansion? Without any equipped spare available in existing one. From old models to new models? From SF6 to SF& FREE? References?
  7. J

    Power Outage at Heathrow Airport - Realiability and Resilience

    Any idea that what could happeded? Harmonics issue? No fire resistant concrete walls between power transformers? Sprinkler system was not operational? No redundancy? Others?
  8. J

    Buried Earthing Grid in Concrete Foundations - German Philosophy

    Attached file with some photos of buried earthing grid inside concrete foundations.
  9. J

    FEED Stage Deliverable Documents

    For a FEED stage do you know which are the minimum deliverables documents (written, drawings and calculations) needed? Is there any standard/rule for it?
  10. J

    Extra Loop for MV Cables

    Do you usually use in electrical installations extra loop for MV Cables in origin/from and destination/to? I believe that is a good solution in case of an event short circuit at its terminals.
  11. J

    Tolerance for rated short time withstand current in MV switchgears

    I was checking IEC 62271-200 and I did not find anything about short circuit tolerances. For example SIEMENS MV Switchgear 8DA10 (40,5 kV/2500 A) model has 40 kA (3 sec). For some project we get IK3"= 40,66 kA. What is your experience about it?
  12. J

    Synchronous Condensor (SC) or Hybrid Synchronous Condensor (H-SC) for Steel Making Plants (SMP)

    My question now is directly use this kind of VSC (Voltage Source Compensation) in Meltshops. As anyone knowledge of this kind of systems in SMPs?

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