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  1. veegrid

    IPS vs EHIPS aluminum tubular bus

    I know IPS aluminum bus and current rating with Sch.40 and Sch.80 bus as per IEEE-605. However, recently I cam across acronym "EHIPS" and it was giving about 10% ampacity than IPS tubular bus. I am not sure what EHIPS stand for and what other specification I should tell fabricator when...
  2. veegrid

    Grounding Study - Insulating Surface Layer - CDEGS Soil Model Manager

    hi, I am from Northeast region of USA. To my knowledge, using soil model manager in CDEGS gives you very high conservative soil model. and we use only summer soil model and not bothering seasonal variation.
  3. veegrid

    Two independent battery system in same control room

    Hi everyone, Typically for the substation control room, where I need to install two separate battery systems, we used to put in a separate room. Recently, I have a few situations where both battery systems need to install the same room. Each battery system is about 1300Ah Lead-acid battery and...
  4. veegrid

    MV Non-SF6 Switchgear

    @ppedUK, in North-east USA, I have worked with 33kV dry-air compact switchgear. We do consider GIS for 115kV and above when open-air is not feasible. But lately, Sf6 is becoming very challenging to get approved, and looking towards non-SF6 alternative for that voltage. For original question, we...
  5. veegrid

    grounding for metal heandrail on concrete staircase

    Hi I have a substation where the control house is about 100ft from the switchyard but within the overall fence. The entrance for the control house is at 5ft elevation from the ground. we have installed a pre-cast concrete staircase. And has recently added a metal handrail. The question is, do I...
  6. veegrid

    What X/R ratio should I consider for Bus Design using IEEE Std 605?

    ok, thanks. Actually this is giving me good start for thinking further. I was looking for X/R for design consideration for 115kV tubular bus for 115/13.8kv system. so 12-15 is incorrect.
  7. veegrid

    What X/R ratio should I consider for Bus Design using IEEE Std 605?

    X/R for the system/source. It is not available, So looking guidance about what number can be assumed for conservative number. OR how can I derive that. I have transformer test report on hand. One of the white paper I was reading, mentioned that when X/R for source is not provided it is safe...
  8. veegrid

    What X/R ratio should I consider for Bus Design using IEEE Std 605?

    What X/R ratio should I consider for Bus Design using IEEE Std 605? for grounding study, I typically enter X/R=20 in CDEGS software. However, for bus calculation, can I consider X/R=10?
  9. veegrid

    Medium Voltage Cable installation into Concrete Trench

    Why cannot medium voltage power cable (5kV-35kV) run into concrete trench? I guess safety issue, de-rating of cable ampacity, .etc? What's thought , direction here?

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