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  1. tomatge

    Relay Coordination Study?

    Personally I'm a little nervous about this thread. You say that you are "a younger, inexperienced electrical engineer" and "am aware of what a relay coordination study is" - which suggests to me that you haven't actually done one or even truly appreciate what's involved or at stake. If you do...
  2. tomatge

    Generator Protection Relay

    You are using a Micom P342 for a 2kW generator? Astonishing. The relay must cost more than the machine it's protecting!
  3. tomatge

    Converting to GE-Fanuc PAC Controllers

    Thanks for your responses guys, I am about to start work on this and will see how I get on. I will take your suggestions into account.
  4. tomatge

    Converting to GE-Fanuc PAC Controllers

    I have developed a number of applications using the GE-Fanuc series 90-70 PLC's. These have been working well for some time. But a possible client has asked if I can provide one application on the latest series PAC RX7i controller. Has anybody experience of converting applications to the new...
  5. tomatge

    Load Bank

    Such devices can also be rented from Aggreko on the UK
  6. tomatge

    SCADA/HMI packages

    I am presently looking at a replacement to an old proprietary SCADA system, and have looked at several. The one that I am lookinmg closely at is Factorylink, made by US-Data (now part of Tecnomatix). Website is http://www.tecnomatix.com What I like about this product is : Scalability Ease of...
  7. tomatge

    LPG Tankers

    Platts have a quite useful introduction to the LNG market. It is not very detailed, but certainly quite easy to understand and may be a good starting point. The address is : http://www.platts.com/Natural%20Gas/Resources/News%20Features/LNG/index.html
  8. tomatge

    Effect of more starts

    athomas This is an interesting investigation ... if your client is running 100MW of diesel power, I've probably heard of the site - can you give a clue as to where this is (even if only what part of world if you have confidentiality issues). I would add that you need to find out what type of...
  9. tomatge

    CO2 Removal from Plant Stacks

    rmw "I only hug the LAWYERS ..." I suspect this is something of a Freudian slip - you know, where you say one thing but really mean your mother.
  10. tomatge

    communication

    Heydave At last ... this question, or variants of it, has been posted many times. Your first paragraph is the clearest and most logical answer I recall seeing ... star from me !
  11. tomatge

    NOx Reduction Techniques

    Taylorg I'm in Europe, but am aware of Caribbean utilities that operate similar plant to ours. I would be interested to know how they are getting on.
  12. tomatge

    NOx Reduction Techniques

    You need to appreciate the characteristics of a slow speed diesel engine to understand the difficulties on this subject, which is why I posted in the Marine Engineering forum. The techniques I suggested are not actually "if all else fails" rather they are the very techniques that the major slow...
  13. tomatge

    NOx Reduction Techniques

    I work for a stationary power plant that uses slow speed deisel (Sulzer RNF and RTA series) engines. At present in my location there is no specific environmental legislation in place in respect of emissions from the power plant, but this is currently under review. Should legislation be...
  14. tomatge

    What is "IRR"?

    I think you were right first time. I believe IRR stands for Internal Rate of Return. This is method of financial analysis by which accountants justify withholding money from engineers, who simply want to spend it on fun and interesting projects. Naturally, the accountants will not tell you how...
  15. tomatge

    Basic Communication Components Help

    It seems to me that the scheme proposed is a method of providing communications to a remote I/O station, with redundant communications paths (ie. fibre and microwave). At first sight, I would suggest the scheme design will be expensive. Firstly, I would establish what type of data...
  16. tomatge

    Expert required - advice on mainline rail power supply upgrade

    ScottyUK Unfortunately, both PB Power and ERA would gain some significant revenue from the UK electrical companies, as would most of the major electrical consulting companies. Conflict of interest may well be an issue. Since it would appear that the intent here is to dispute the need for...
  17. tomatge

    DSL speed for dial-up

    JohnFortier What medium do you think DSL uses ? DSL (operated in a variety of forms, the most common being ADSL for home internet connections) uses standard telephone wires. It operates at a higher frequency range than normal voice communications, and can therefore provide simultaneous voice...
  18. tomatge

    Five Rung Logic

    So what does "5 rung logic" mean - is it maximum of 5 runs per subroutine ??
  19. tomatge

    PC based industrial control to replace PLC

    My thoughts on some comments above ... In terms of "advanced functions" some PLC equipment is better than others. nbucska's question about trigonometric equations may not be possible or easy on basic PLC equipment, but relatively simple on more top-end gear. For example, with GE-FANUC...
  20. tomatge

    FSK Multiplexing?

    Are you sure about the details on your modems? The frequencies you state are clearly highly unusual and as BrianG states are not within the PSTN/telephone line spectrum. Do you have any information of standards to which the modems are designed?

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