Continue to Site

Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

Register Log in
  • Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  • Users: wuqn
  • Content: Threads
  • Order by date
  1. wuqn

    Load shedding

    hi every body My underfrequency relay is used to remove load out of the generator (load shedding). I want to change the time delay. What delay is suitable ? How do i calculate the delay? the method ?
  2. wuqn

    TSX QUANTUM HARDWARE

    Dir sir/madam, My system's analog input card shows a fault led. After checked i found that the output voltage of an input was instable. Its flunctuates from 5-20 Vdc. The input is connected to a pressure transmitter. The system is TSX QUANTUM. The analog input card is 140 ACI 03000. What's the...
  3. wuqn

    power factor not stable

    the system has three paralelled generators. But the power factor of the two is not stable. one's PF increase then the other decrease. I don't know why. what's the problem? how can i fix it? thanks.
  4. wuqn

    start up current

    the system has one generator. How much is reserve power so that I can start up a large motor? Ex: generator: 480kW, motor: 110kW.
  5. wuqn

    compensate reactive power

    we have 3 generators that are paralleled. Can we use capacitors to compensate the reactive power of the system? we want to reduce the current through the generators.
  6. wuqn

    unbalance voltage

    hi when generator run, measured voltages : Vab= 417, Vbc=420, Vca= 392. Vca is much lower than the others. what's the problem ? how can i fix it? thanks
  7. wuqn

    negative sequence current

    droop, level and gain of AVR(automatic voltage regulator)'s is not set properly, can it cause negative sequence current ?
  8. wuqn

    cable gland

    hi when a cable gland is rusted, should i replace it?. which standards for inspecting it? thanks.
  9. wuqn

    load program from plc

    hi i want to download the program from plc's memory. how can i do? PLC S5-95U Thanks.
  10. wuqn

    checking equipment in zone 2

    hi I'm looking for standards for checking junction box, motor, gland cable in zone 2. thanks.
  11. wuqn

    standard in zone 2

    hi which standards for checking junction box, motor, gland cable in zone 2? thanks in advance.
  12. wuqn

    standard for maintenance

    who know standards of maintenance of equipment in Zone 2 ? (Ex: maintenance of junction box, maintenance of gland cable, maintenance of motor...)
  13. wuqn

    check electrical safety in a plant

    the equipments is in zone 2. But are they always safe when they've been in use for a long time ? Who knows standards for checking them if they are still used in zone 2?
  14. wuqn

    AVR FOR CAT'S GENERATOR

    HI WHO HAVE THE SERVICE MANUAL OF AVR SR4 OF CATERPILLER'S GENERATOR ?

Part and Inventory Search

Back
Top Bottom