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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

    35kV Line Reactors

    I have never seen any application for your purpose. Only for the following applications:
  4. 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.

    Yes. It is possible to compare in terms of technical and economical.
  5. 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.

    Yes it is clear that if we need to transport more power we need o increase the voltage. I am mentioned for case study shown in image. I believe the best option is going directly from 30 kV to 0,4 kV. If we need 6 kV voltage level we add a transformer for that loads.
  6. 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.

    Agreed. Attached economical evaluation. Best option is to go directly from 30 to 0,4 kV
  7. 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.
  8. J

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

    Thanks however I mentioned pipe gas and not come conveyor.
  9. J

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

    I believe the pipe with energy gases (COG, BGF and BOFG) could be classified and we are aware to leave a minimum distance to it. Apart of ATEX could be another issue related with EMC. Yes the pipe has high temperatures (I do not know the value). We are talking UHV/EHV cables = 400 kV and 230 kV
  10. J

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

    Energy gases (COG, BGF and BOFG) are mixed, and the result is called BLG (“blandgas”). This gas will be fed a CHPP. Regarding ATEX maybe in some areas where are located some valves/instruments in that pipes. Main goal is to calculate the minimum distance between UHV/EHV cables and that pipe.
  11. J

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

    Vacuum CB's up to 4000A for integration into MV SWGRs for special applications (example: Simetal Sivac-X furnace switchgear) and not into conventional GIS or AIS MV
  12. 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?
  13. J

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

    Could be. We have mentioned 36 kV.
  14. J

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

    5000 A in busbars. Feeders is 2500 A maximum.
  15. 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?
  16. J

    EHV/UHV GIS Expansion from Existing One

    Service Continuity in GIS: https://new.abb.com/docs/librariesprovider78/eventos/jjtts-2017/presentaciones-peru/%28jessica-poncedeleon%29-consideraciones-de-seguridad-y-disponibilidad-en-el-dise%C3%B1o-de-equipos-gis.pdf?sfvrsn=2
  17. J

    Power Outage at Heathrow Airport - Realiability and Resilience

    According NESO (UK TSO): NESO will submit an initial report to the Secretary of State and Ofgem within 6 weeks, with an initial assessment of the data available at this stage of the review. NESO will provide a final report to the Secretary of State and Ofgem by end of June 2025, which will...
  18. 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?
  19. J

    Power Outage at Heathrow Airport - Realiability and Resilience

    I saw something in youtube and prepared some photos. Link for youtube is inside file.
  20. J

    Poor Power Factor

    As per ETAP simulations is possible to improve PF with VFD.

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