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  1. genRman

    Increase of corona discharge in HV machines due to high altitude

    I am searching for information with regard to assessing the need for increased winding clearances in HV generators due to higher altitude siting, due to higher potential for corona discharge damage. Clearly the atmospheric pressure will be reduced & hence the resistance to discharge reduce over...
  2. genRman

    Q - Spurious HV genset earth currents source

    Could anyone provide enlightenment on a problem I am facing with a Gas engine driven 11kV genset? We have a gas engine, direct coupled (frame close coupled) to a 11kV 2/3rds pitch 3250kVA generator. Connection is in start with a floating neutral. Customers load lead connections are made in...
  3. genRman

    Shorted turns faults on synchronous rotor field windings

    Gentlemen, perhaps I've miss stated my question! My rotor - salient pole has indeed got shorted turns on it,detecting it is done through an AC resonance test with a comparator sometimes called a shorted turns indicator. The rotor has 800 turns & so whilst rotational tests seperately excited do...
  4. genRman

    Shorted turns faults on synchronous rotor field windings

    Can anyone suggest reading material or have some knowledge of investigating a main field shorted turns problem on synchronous machines? I have a 3 phase synchronous machine, but am concerned that at some point during operation, it gets into a slip operating condition, such that it effectively...
  5. genRman

    Synchronizing Cummins-Onan and Caterpillar Units

    Joan271273, meihem makes a good if brief comment. I would suggest the correct method to use for investigating the possibilites of paralleling different types of genset would be to refer to the manufacturer of each genset, quoting type, serial number of the genset and the generator. to my...
  6. genRman

    Gas engine misfire torsional study & affect on power provided

    VibEngr, Troy Thanks for your assistance & an advance copy of your paper, it looks very interesting & I will be taking some time to read it in detail. Thanks also for the reference notes, I appreciate the time & effort taken to reply.
  7. genRman

    Gas engine misfire torsional study & affect on power provided

    Hello, I'm an electrical engineer in need of some direction pointing! Has anyone got information on high horsepower natural gas engines, where a study of torsional analysis has been completed to discover the effect of cylinder misfire on the power provided to a shaft driven, direct coupled AC...
  8. genRman

    HV DC testing

    Thanks electricpete, since posting the inquiry I found the exact site you have provided & obtained some very informative data on the oposing techniques.
  9. genRman

    HV DC testing

    Could some learned gentleman please advise where I might obtain reference material for HV DC testing of rotating electrical machines. It is recognised practice to verify the condition of a synchronous generators main stator winding insulation system with a High Voltage AC withstand test at (2x...
  10. genRman

    Generator Neutral

    My reccomendation would be to press the manufacturer to find out why he does not wish to make a reccomendation. You need to know if the neutral is fully rated or not. Some manufacturers do not bring a fully rated neutral outside of the stator winding and hence their machnies fault carrying...
  11. genRman

    Theory of electrical HV impulse affect on steel lamination insulation

    PRC, Thanks for your posting. Could you please provide detail on exactly how the core loss is expected to be reversible? my investigations thus far have shown burr and pressure induced shorting of the laminations but I donnot understand how this could be reversed as I understood once the short...
  12. genRman

    Theory of electrical HV impulse affect on steel lamination insulation

    Electricpete, the test work I am involved in is inter-turn insulation testing of inserted coils in the core, but ones which are not yet connected in groups of phases. Your comment may mean that this is a new area for consideration in a very specialised field. Thanks anyway
  13. genRman

    Theory of electrical HV impulse affect on steel lamination insulation

    Could someone provide information with regard to the theory of how HV elecrical impulses travel in transformer motor and generator core steel laminations, from the windings through the insulation coating? I am presently involved with form wound winding interturn tests and have noticed that a 0...
  14. genRman

    HV Cable Stress Cone Application guidance

    Gordonl, thanks, I was looking for more information on electrical stress field data, how the equi-potential lines vary with and without stress cone application, how to quantify the benifits of stress cone application & how to identify the reduction in stress concentrations in key areas of the...
  15. genRman

    MECHANICAL vs. ELECTRICAL OUTPUT

    Just an observation, but you say that the fuel tank has been refurbished and fuel filter replaced. I once had a similar condition, where a day tank fuel filter ( built into the tank) was fitted with an undersized coupling bore & hence was providing a fuel restriction. If you are scratching your...
  16. genRman

    HV Cable Stress Cone Application guidance

    Can anyone point me in the right direction for guidance notes on the application of cable stress cones for HV systems up tp 15kV please? Thanks
  17. genRman

    HV Cable Stress Cone Application Guidance

    Can anyone point me in the right direction for obtaining application guidelines / notes on HV stress cones for cable systems up to 15kV please? Thanks
  18. genRman

    Regenerative braking and Generators

    I've had some experience in regen braking on RTG cranes with diesel generator plant, where the resistive dump bank has not been sized sufficiently. The net result is an increase in genset speed as the set goes into reverse power mode. In one instance in the UAE, a 1500kVA D/G set went to 2050RPM...
  19. genRman

    Monitoring of Rotor temperature

    Electricpete, where can I find this EPRI doccument please? Also, in my experience, the hottest spot is two or three laminations ( turns) away from the steel corner of the core pack, as this is the area least cooled and suffers most from the restrictions in heat dissipation due to transfer of...
  20. genRman

    Monitoring of Rotor temperature

    RAgrawal, Does your rotor have slip ring connections? If you can monitor V & A imput to your main field winding, you can derive R in ohms From there, and with the aid of your manufacturers cold resistance figures and ambient temperature taken at that time, you can use: temp(Deg k)=[(R hot-R...

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