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  1. nag400

    Rising the Xfmr Tap Causing HV side to be down

    Dear SidiropoulosM, The concept is clear as stated earlier , But with regards to the digital simulation you are referring to using any of the standard packages.Let me put an example here. The things will be as follows.(if i am referring to similar power system analysis packages including the one...
  2. nag400

    Rising the Xfmr Tap Causing HV side to be down

    Members,... if appropriate in this context, let me put my views by practicle example of a transformer The transformer is rated 13.2 kV /480 V. (Almost the same has been mentioned by jghrist) Volts % TAP 13860 (1.05) 1/A 13530 (1.025) 2/B 13200 (1) 3/C 12870 (0.975) 4/D 12540 (0.95)...
  3. nag400

    Dynamic Study Modelling

    Dear MohandesDawood, Plese look for standards from Westinghouse T&D book.(If members can provide link of the above..??) The book contains the zero sequence impedances to be considered for different voltages of transmission line. We take usually 2.5 times the positive sequence impedance for...
  4. nag400

    Fault level

    Dear govender1, Fault level at a bus or at a transformer or at any other part of the system refers to the same. It is the MVA / current that will appear at the terminal of the equipment wheneven falut occurs. May be you can define it for a Balanced fault ( 3 phase to ground) and un balanced...
  5. nag400

    SSR

    Please note this extract from : Power System Dynamics Stability and control -- By K.R Padiyar The application of series capacitors for long distance power transmission helps in improving power transfer and is economical compared to addition of new lines. While it has been known that series...
  6. nag400

    Power Quality

    Dear LARGrizzly, These questions arise and people will think of electricity only when these type of non-trivial problems arise. and its obvious that electricity / power will be cursed.. sorry for being ironic but it is the fact everyone is aware of.. May be the following suggestions will...
  7. nag400

    System fault levels

    May be this will help Breaking Current : Highest value of short-circuit which a circuit breaker is capable of breaking under specified conditions of recovery voltage and power frequency recovery voltage. It is expressed by two values 1. RMS value of the ac component at the instant of contact...
  8. nag400

    System fault levels

    May be this will help Breaking Current : Highest value of short-circuit which a circuit breaker is capable of breaking under specified conditions of recovery voltage and power frequency recovery voltage. It is expressed by two values 1. RMS value of the ac component at the instant of contact...
  9. nag400

    Paralleling Transformers

    If you operate two transformers with different impedance in parallel, (assuming that the transformers are of the same rating) the transformer which has low impedance path will try to carry most of the loads (because current always follows the least impedance path) and the other will carry...
  10. nag400

    hormonics

    Dear tyuu, Here is an extract from "IEEE recommended practices and Requirements for Harmonic control in Electrical power Systems" IEEE Std 519-1992. The non-linear loads connected to electric power systems include static power converters, arc discharging devices, saturated magnetic...

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