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  1. Emadshaaban1987

    Earthing system measurments

    Hi experts The ground system of our (industrical plant) is baised on many ground rods in diffents areas ,that are connected to the same ground network. using Megger DET24C . The measurmetns of some rods show relativluuty high grounding resistance (40 to 110 Ohm) . what is the minium reading and...
  2. Emadshaaban1987

    Neutral voltage in 35MVA transformer

    A new 30MvA 11kv generator connected to a new abb 35MVA 11/20kv ynd11 transformer.to be synchronized with other genset in 20kv busbar. My questions are: 1-We started the set with no load ,all phases voltages in transformer output are identical 20kv but residual voltage (read from broken delta...
  3. Emadshaaban1987

    motor earth fault set point

    HI How to select the earth fault protection set point for the low voltage electrical motors? Does it depends on the system voltage, motor size? Earthling system type? I can make an example: 0.4kv 37kw induction motor, neutral is direct connected to ground?
  4. Emadshaaban1987

    olympian GEH250 not able to start up

    olympian GEH250 cracks but can’t startup ,only if fuel valve supplied directly. With out diagnosis tool it is difficult to diagnostic the fault in ECM Is there any way to spot which sensor by unplug the defect one or any other way
  5. Emadshaaban1987

    3ph 220v to 380v

    Hello A very old 37.5kva GM generator with Markon alternator. It gives 3ph 220 volt with manual voltage regulator (external auto transform) Please see the pictures. I would like to convert the system to be 3ph 400v but the connection of alternator terminals look confusing Can any check the...
  6. Emadshaaban1987

    phase displacement

    Hello 1.8kw ,6.6kv motor was in solo running with out coupling .what is the response of phase 2 current displacement as shown in graph . https://files.engineering.com/getfile.aspx?folder=193d5823-ca34-44be-9469-6bb0b9d8e1bf&file=D054C86F-520A-4115-B59B-E15750891160.jpeg
  7. Emadshaaban1987

    RTD Pt100

    Hi Folks RTD Pt 100, fixed on the bearings of 1.8MW motor . Due to failure in the lubrication system . the bearing were melted and the motor stopped manually before the RTD detected the over temperature. The RTD removed to be tested in heating bat, the temperature take 8min to rise form 20c to...
  8. Emadshaaban1987

    Caterpillar powerwizard 1.1

    Hi caterpillar controller 1.1 fail to switch to auto mode because push button. Can I set a free input to switch the mode to auto . If so,can that be done by a manual programming?
  9. Emadshaaban1987

    power transformer tripping

    Dear Folks, Power transformer 20kv/6.6kv 5MVA ,transformer outgoing tripped by (27),l1=6.2 l2=5.5kv l3=4.3kv ,it seems that the voltage dipping is in one phase only L3 the transformer is protected with many protection units (87T,50,51,64) but non has popped up except 27 -no new load was...
  10. Emadshaaban1987

    CAT PowerWizard problem

    Hi Folks Caterpillar generator engine C15 controlled by PowerWizard The controller can not run in auto mode during simulation of power cut. When manual mode activated the machine run only while holding run button and stopped when Leaving it.
  11. Emadshaaban1987

    Volt load protection module

    Hi Folks cat engine driven by ecu with a VLPM Voltage load protection module ,is it possible to bypass this defected module,if so what is the procedure?https://files.engineering.com/getfile.aspx?folder=203b09f2-1a52-481a-b112-e34df900c26a&file=8FD35007-E49E-4C64-9A78-D8D2F4DABCB1.jpeg
  12. Emadshaaban1987

    Change AVR type

    Hi folks A compound avr (coils) as shown in attachment has a damaged coil. Is possible to change it with an electric avr (self excitation) What kind of re-wiring need ? Amplitude of need AVR...
  13. Emadshaaban1987

    Low PF on 3ph generator

    Hi folks, A 3ph PMG generator driving load with a very low power factor 0.37. The engine fail after 2 to 3 hours. Please see the attached picture. What are the reasons of low Pf rather than load types .would the low pf course generator to shut down with out a alarm...
  14. Emadshaaban1987

    Load unbalance in three phase generator

    Hi folks, 1-What are the side effects of unbalanced loading of three phase generator? 2-What are the acceptable range of current unbalancing that will have no serious effect to the generator? 3-If the windings of generator has reconnected to be a single phase rather than three phase Does...
  15. Emadshaaban1987

    Start and stop generator automatically

    Hi folks I need a wiring diagram for start and stop 70kva generator with using motorized changeover switch. The generator is with out an advanced controller.
  16. Emadshaaban1987

    Digital input

    Hi Does the long cable that connect feedback switch to the PLC input (110v dc)is affected by long distance,in which it would cause virtual digital 1?
  17. Emadshaaban1987

    Insulation test

    What is the testing voltages for insulation test Megger of motors (6.6kv and 0.4kv) and cables? Why the measured IR for the same machine will varied if testing voltage change?
  18. Emadshaaban1987

    Technical training for a long term

    Hi folks I am afraid if this is the right place for this question !but this is the best place i knew that gathering experts I am an electrical engineer and i have awarded a scholarship from my company for a one year .i do not like to do an academic course but i do like to have advanced...
  19. Emadshaaban1987

    Tan delta vs IR

    Hi folks What is the benefit of conducting tan delts test rather than usual meggering test? When applying tan delta test is important?
  20. Emadshaaban1987

    Motor over temperature

    1800kw 6.6kv 3ph induction motor that has just arrived from rewinding by the manufacture . During SOLO run test (no load ), the current consumption was 37A for each PH But the RTD PT100 detected more that 100C for each phase and almost 50C for both bearing sides What is the possible causes of...

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