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  • Users: EKTORAS
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  1. EKTORAS

    Breaking current >Making current ??????

    Make current is greater than the break current. Note the difference: Make current is considered as the peak assymetrical value of the fault current and is measured at 10ms (first half cycle) after the fault onset. Break current is considered as the rms assymetrical value and is measured in the...
  2. EKTORAS

    How Shunt Trip Works ?

    To electricpete, The way I get it the term "shunt" is derived from the fact that the shunt trip overrides any other command being imposed.
  3. EKTORAS

    synchronous motor as generator

    Dear friends, in the following mmf stands for magnetomotive force. In the case of a synchronous generator/motor, rotor and rotor field (mmf) travel with exactly the same rotational speed (w) with the stator field (mmf). Power transfer depends on the angle delta (ä) between the two mmf vectors...
  4. EKTORAS

    ELECTRICAL DRAWINGS

    I use AUTOCAD to draw the power distribution one line diagrams as well as the control circuits. There is no specific way to do it quickly. However drawing with AUTOCAD is very productive if you have already prepared most of the possible configurations of protective devices or control relays and...
  5. EKTORAS

    Reversing a three phase electric motor.

    I'd like to add to the above postings that it is important to reverse the direction of rotation by the method proposed (swapping two of the phases) after the motor has stopped. If you do it while it is running, it will be braked (condition named plugging) drawing a very high current equal to or...
  6. EKTORAS

    Electric motor braking

    Ask for the book "Alternating current machines" by M. G. Say. Capacitive braking is discussed in the motor braking chapters and I suggest that you study it with reference to the paragraph concerning regenerative braking.
  7. EKTORAS

    mechancial motor braking

    rioneill, Capacitive braking that you are asking for, belongs to another category of braking named regenerative braking. In this kind of braking kinetic energy is removed from the rotating load and the motor is instantly turned into a generator. We can do this, for example, with a motor that...

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