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  1. emmjea001

    optimising feeder cables, location of dist. pillars & supply cables to these dist. pillars

    Thanks BlackJack - it is useful - was hoping to avoid programming it myself as assumed this must be a common problem in electrical reticulation - but as your is only response I guess not!
  2. emmjea001

    optimising feeder cables, location of dist. pillars & supply cables to these dist. pillars

    Dear members, For the case of supplying power to residential consumers at LV, the model is normally a group of houses connected via relatively small cables (16mm) to a centrally located distribution pillar, this distribution pillar is in turn fed via a much larger supply cable, either part of a...
  3. emmjea001

    mitigating low voltage on 11kV feeder using 11kV/11kV autotap change or STATCOM

    @dpc - I am keen to find out more about the merits of the various options for connecting regulators - especially in terms of what you say about it's not a good idea using 2 for a 3 ph system? If you can point me to any reference would be much appreciated? Check out page 4 on this doc...
  4. emmjea001

    mitigating low voltage on 11kV feeder using 11kV/11kV autotap change or STATCOM

    Thanks @dpc - I believe you can also use 2 x single phase units in open delta to achieve reasonable regulation - I am not sure of the advantages of using 3 units vs 2 - I assume more capacity and hence greater range on limits? @itsmoked - indeed - in fact this was the first thing we did, so we...
  5. emmjea001

    mitigating low voltage on 11kV feeder using 11kV/11kV autotap change or STATCOM

    Thanks for everyone's response. I hear you loud and clear on working with the utility - and the idea that although a voltage regulating transformer may work, it simply passes the strain back to the utility - and it will be a parallel and slower moving process, but for now production must...
  6. emmjea001

    mitigating low voltage on 11kV feeder using 11kV/11kV autotap change or STATCOM

    Hi, the 11kV feed to a factory with about 2 / 2.5 MVA demand is facing low voltage problems (9.6kV) from the utility side - lets forget about them fixing it, or reasons why, but look at how to fix it ourselves. I have never used one, but assume you could put in a single 11kV/11kV auto tap...
  7. emmjea001

    Problems with Dry Type Transformers on cold loading in backup power situations

    Hi Everyone, I was wondering about experience using dry type TX where they are used as step up units as part of the generator backup scheme - here you will have the plant load immediately present on the TX's once the generators have started, and they take the full plant load from cold. I...
  8. emmjea001

    Transformer Room Design and MV switch gear etc

    Thanks everyone for the input, some summary answers: the local codes are very "loose" and do not require it, but they date back to the 1960's so to be expected - bottom line is both the local codes and the relevant departments really have very little to say on the matter - I've tried! I would...
  9. emmjea001

    Transformer Room Design and MV switch gear etc

    Hi, I am looking for a standard or guidance note covering the need for trenches or bund walls to mitigate against oil spilage and fire risk? The local authority here only have approved designs for substations that are externally facing, in this case I have a client owned substation which is...
  10. emmjea001

    metering solutions to avoid being charged / billed while on generator power

    I have a 10 house development that we want to have a central meter room, and from then downstream it will be the clients network. The problem I am having is how to provide for a central backup generator but avoid this running through the meters I also want to ensure that end users (houses)...
  11. emmjea001

    Power quality analysers

    Mike L, thanks great info, and good questions, will re-read and take that in, many thanks to you and everyone else for your input
  12. emmjea001

    Power quality analysers

    MAZ13, sorry I did not add, this needs to be a portable analyser. I see the Hioki 3196 has been discontinued. I was hoping to find something decent in the 3000 USD range, but it seems most models I have been referred to are 7k plus... I have also seen a Vega 78 unit...
  13. emmjea001

    Power quality analysers

    Thanks Pafi and MAZ13 - some good feedback and valid points about no on instrument display. I have only ever really done load profile surveys, and some harmonic analysis, but that's all I could do as I only ever had a VIP System 3 from Elecontrol. Now I am looking to replace it, I want to get...
  14. emmjea001

    Power quality analysers

    Thanks Guys As a matter of interest I looked up voltech and it looks like it has been taken over by Tekronix! Can I ask why you dislike the fluke Scotty? it seems to offer quite a lot with not a bad price tag? Appreciate the feedback
  15. emmjea001

    Power quality analysers

    Hi All, I was hoping to get some user experience on power analysers, I have been looking at the Fluke 1735 unit and the more expensive Elspec G4500. Would appreciate any comments if anyone used either of these? Thanks
  16. emmjea001

    running generators at very low ( <0.7) PF

    I am still waiting on the manufacturer to provide the capability curves, and to explain why they have given a very generic "our application engineers stated the sets should not be run with PFC equipment connected"... anyway, aside from this, I have another question I do not quite know how to...
  17. emmjea001

    running generators at very low ( <0.7) PF

    Thanks again both waross and iceworm, very helpful comments, and a bit of feedback ... - no reluctance at all to call mfg and had already asked them for the curve when u mentioned it - yet to get a response, but in the interim, wanted to carry on with my line of questioning... - de-rating...
  18. emmjea001

    running generators at very low ( <0.7) PF

    Thanks for the input iceworm and waross, Maybe I can just clear the de-rating issue as this seems to be clouding things somewhat and detracting from what I think are the core issues. So the sets have been de-rated by 17%, I got this figure from 8% on the engine, based on the engine de-rate...
  19. emmjea001

    running generators at very low ( <0.7) PF

    Thanks waross, The attachment as you correctly say is for the alternator, I did not use this for the re-rating, I used the engine sheet (which I did not attach, as no need, I am happy with engine re-rating) I attached the alternator sheet as iceworm asked for it to have a look for the...
  20. emmjea001

    running generators at very low ( <0.7) PF

    Thanks, - I am derating due to Altitude and temperature - the attached data sheet refers However, aside from the above, confirm my assumptions or logic are ok - in that the alternator is effectively oversized anyway, and so with the low PF I should not have to worry? Regards...

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