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  • Users: Murlinor
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  1. Murlinor

    Switchgear in AEx area

    Friends, I want to install a switchgear in a class 1 division 2 AEX area. Someone has suggested to use a SF6 insulated padmounted switchgear. The question is if the switchgear tank is intended for use in class 1 division 2 (group D) area, what then about the elbow cable connector to be to...
  2. Murlinor

    VSD and circuit breaker

    Hi all. If one has the following scenarion: Supply network->VSD->transformer->cable->motor. Is it possible to utilise the VSD as a protection against short circuits? Or should one have the following solution: Supply network->VSD->transformer->Circuit breaker->cable->motor Help is appreciated.
  3. Murlinor

    VSD and short circuit contribution

    Hello friends. I have a 6.6 kV VSD connected to a 6.6/50 kV transformer. I am designing a 50 kV switchgear panel and was wondering if the VSD will contribute to the short circuit current at the 50 kV busbar? Thanks
  4. Murlinor

    IEC60909 or IEC 61363-1

    Hello. I am working with short circuit calculations on subsea electrical installations. Which standard IEC shall be applied IEC60909 or IEC 61363-1? Thank you. Best Regards Murli
  5. Murlinor

    IEC60909 correction factor

    Hello Friends. For two winding transformers IEC60909 describes correction faactor for impedance. The c factor to be used is cmax. When calculating minimum currents, should the correction factors be omitted? Because the formula for correction factor is based on cmax and not cmin?
  6. Murlinor

    Bolted/solid faults

    Hello Friends. I have a question regarding IEC60909 and bolted fault. Generally for a single phase to earth fault the current can be written as follows: I''k1 = sqrt(3)*Un/(z1+z2+z0+3Zn+3Zf) Where Zn is the impedance connected to neutral and Zf is the fault impedance. IEC omits the fault...
  7. Murlinor

    Transformer rating with single phase loads

    Hi. Assume that the single phase load is connected as follows (balanced): L1-L2 = 23 kVA L2-L3 = 23 kVA L3-L1 = 23 kVA All loads are resistive. Based on the above load, what will be the kVA rating for a 3 phase supply transformer? The network is 230 V i.e. 3 wire system with isolated...
  8. Murlinor

    Induction motor with Drives

    Hello! When starting a induction motor with drives, one usually start at low frequency and get high output torque, and the inrush current is reduced dramatically compared to DOL start. Can someone explain why the inrush current is reduced? Thanks

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