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Recent content by mithko

  1. mithko

    Assymetry in 3 phase supply

    Thanks guys, form what you guys are saying I gather the following: 1. the reason why assymetry will cause increased heating in transformers is purely due to the presence of zero sequence current.(SINCE NEGATIVE SEQUENCE COMPONENTS DONT HAVE ANY EFFECT) 2. Tripple-N harmonics (3,9,15,21,...) can...
  2. mithko

    Assymetry in 3 phase supply

    thanks guys...what I meant was "does the presence of negative sequence currents in transformers mean that you have additional heating that you would otherwise not have in the case of a symetrical supply".
  3. mithko

    Assymetry in 3 phase supply

    "Transformers handle negatvie sequence components the same way they handle positive sequence components" 1 .Does that mean that the negative sequence do not have bad effects on transformers such as increased heating? "zero sequence components affect transformers in a way that depends on their...
  4. mithko

    Measuring Moisture in oil

    Hi, How is moisture/water content in oil (say from a transformer) measured (in ppm)? What apparatus and test is used?
  5. mithko

    Temperatur switching/control of fans

    I am looking for a system that can be used to cool and ventilate a workshop as follows: 1. At temperatures below 28 deg C,only a few of the fans are on. Say 10 of the 20 fans. 2. At temparetures above 28 deg C, the rest of the fans switch on. 3. The fans that are normally on (the 10...
  6. mithko

    Relationship between System Earthing & circuit protection

    Is there any particular relationship between the type of system earthing and the protection of the circuit? What are the typical examples. Regards, Mithko
  7. mithko

    Synchronous Motor

    For a synchronous motor: 1. what's the relatiship between the output power (or output torque) and the supply current? 2. does the rated current refer to the current from the power supply to the stator windings or does it refer to the field current which is actually fed into the rotor windings?
  8. mithko

    230V 50Hz to 110V 60Hz

    I live in South Africa where we use 230V@50Hz (yes there is electricity in Africa :)). I bought some device that has battery charger with a 110V@60Hz ac input. 1. Is there a device I could use that takes in the 230V@50Hz and converts to 110V@60Hz? 2. If not could I just get a transformer to...
  9. mithko

    microsoft applicatons for sony erisson

    hi anyone ever used microsoft applications such as excel,powerpoint etc. on a mobile phone. i've seen a nokia with such a feature. anyone know anything about such app for sony ericsson or motorola v3?
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