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  • Users: Elecme
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  1. Elecme

    Swimming pools

    You may refer to NFPA 70 as well for swimming pool lighting and the necessary protection required. Elecme
  2. Elecme

    Finding transformer magnetizing kVARs?

    There are two kvars that should be considered for any transformer: Fixed kvar and this is related to the magnitizing current Step kvar and this is dependant on the loading Such figures are almost known and available at manufactureres. Try [u]www.trafounion.com Elecme
  3. Elecme

    grounding generator netural

    You are mixing two grounding systems in one, and you now have two separate grounding paths. Even this may affect the operation of the circuit breakers. You really need to get an engineer (Specialist in grounding) to see and decide after Elecme
  4. Elecme

    GENERAL PURPOSE EQUIPMENT IN HAZARDOUS AREA

    Jbartos: is it a must to have that redundant operation of the ventilation,cause i doughpt that it has to be . as you said. Elecme
  5. Elecme

    Switching surge?

    I agree with Jbartos that the reason may be the capacitive charging in the transmission line but this is for scenario #2. As for scenario #1. For scenario #2, I belive you should check the step up scheme(transformer and circuit breaker) and take some measurements. Elecme
  6. Elecme

    GROUNDING OF 11kV DIESEL GENERATOR

    bigamp, you got a star. Can you eleborate more on your paragraph below "If the generator has to operate in parallel with others, it is a good idea to tie its neutral earthing system in with that of the other generator(s) so that only one generator neutral is ever earthed. This will still...
  7. Elecme

    GROUNDING OF 11kV DIESEL GENERATOR

    Is it a MUST that all MV (11kV) generators to be grounded through impedance? or can we connect a 11kV generator solidly to ground?...when do we need each type of the following grounding system: · SOLIDLY GROUNDING · LOW IMPEDANCE · MEDIUM IMPEDANCE · HIGH IMPEDANCE Elecme
  8. Elecme

    COMPLETE OR PARTIAL COVERAGE

    Is it mandatory by the code to provide complete detection in high rise building with mixed activities (Library, theater, restaurants, offices etc.)or partial coverage is sufficient. Elecme
  9. Elecme

    UNDERVOLTAGE RELAY

    The following statement is written in IEEE - buff book Std 242 -1986:4.5 (1) Bus Undervolatge Protection "A time delay relay is normally used to enable it to ride through momentary dips, thus preventing nuisance operation. An instantaneous undervoltage relay with its contact connected in...
  10. Elecme

    UNDERVOLTAGE RELAY

    Why sometimes it is preferred to use instantaneous undervoltage relay with a time delay one in bus protection? Elecme
  11. Elecme

    MV generators

    Do we have to ground the MV (11kV)deisel generators through impedance ?.... and what is the difference between high, low impedance and solidly earthing rather than the limitation of the fault current and the interruption at 1st or 2nd fault......etc. Elecme
  12. Elecme

    POWER PLANT

    I am very interested in small power plants, composed of number of generators synchronizing switchgear and the like. I am talking about a specific job, which is providing an industrial area with a power estimate of 12 MVA with such a small power plant. I have the following inquiries: What is the...
  13. Elecme

    IRON CORE EARTHINGH

    can you elaborate more about the 1st point? Elecme
  14. Elecme

    IRON CORE EARTHINGH

    Can some advise, whay the iron core of the transformers is earthed? Elecme
  15. Elecme

    What about lightly loaded transformers.

    I am talking about light load, which means lesser current. Elecme
  16. Elecme

    What about lightly loaded transformers.

    What do you think about loading a 11/ 415 V transformer by a light load (25 - 30 %) of its rated capacity. Are there any problems with harmonica ?!What about the effect on the other loads. Elecme
  17. Elecme

    Over Voltage on The Other Two Phases...

    In case of phase to ground short circuit, will we experience a case of over voltage on the other two phase in a specific earthing system? Please elaborate. Elecme
  18. Elecme

    Twisted Pair Cables

    What are the benefits of the twisted pair cables in the field of signal transmitting process? I have to approaches for the issue as follows: 1. Due to the twisting of the cables, any field that will be appeared on one line, because of mutual capacitance between conductors, will be eliminated...
  19. Elecme

    Exhibition Halls...

    I am now working on the design of the sound system as well as voice/ data network of a great library whcih contains many exhibition halls. Can any one help tell me the concept of design or his recomendation for these systems? I prefer wall mounted speakers and local matrix switch for each hall...
  20. Elecme

    SF6 Leakage in a 225kV Substation

    Guys, what about my question? What do you recomend for the repair of this leakage? Elecme

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