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  1. vp1959

    Leakage Current from the Alternator

    Hi Gland plate issue is already rectified (tested without gland plate and then modified the plate with slots), but still there is a leakage 1A - 4A at 100 - 400kW Regards Prakash
  2. vp1959

    Leakage Current from the Alternator

    Hello Mr. Bill & Mr. Raghunath, Please find attached drawing to have an idea, noting that: 1) The generator is used for feeding two 150HP mud pumps 2) The leakage problem is common with the above site loads and the tests at workshop with a load bank (Resistive load) 3) We have confirmed that...
  3. vp1959

    Leakage Current from the Alternator

    Hi Kindly review the following for a generator rated for 500kVA, 400V, 3P4W, 50Hhz, fitted with Unrestricted Ground Fault Protection System is tripping on ground fault. Upon inspection we have found: 1) The insulation resistance for all winding are over 1000 M.Ohms 2) There is no leakage from...
  4. vp1959

    Repeated Alternator Failures on a Power Plant rated for 16MVA /11,000V using 12x 415V Generators.

    Hi ScottyUK Such corrosion on exposed/ uncoated steel are common here, including on stainless steel, galvanised steel, etc. If the blackened area you mensioned is in the rotor, then it is not corrosion, instead it is exposed winding/ varnsih (the area where the winding strip broken/ lost). The...
  5. vp1959

    Repeated Alternator Failures on a Power Plant rated for 16MVA /11,000V using 12x 415V Generators.

    Hi catserveng I don’t know where you have seen corrosion in the photos? I do agree that the reasons specified for corrosions, but there is no such corrosion in the subject generators. However, as you mentioned, I strongly suspect that the failure is due to substandard insulation system...
  6. vp1959

    Repeated Alternator Failures on a Power Plant rated for 16MVA /11,000V using 12x 415V Generators.

    Please see the attached photos of one of the alternators failed (flash over first and later rotor) Also we lost another alternator (same brand & model) due to stator failure (stator winding burnt). It was running alone (island mode) in place (Kuwait) where no much humidity and load is below 80%...
  7. vp1959

    Repeated Alternator Failures on a Power Plant rated for 16MVA /11,000V using 12x 415V Generators.

    [highlight #8AE234][/highlight]
  8. vp1959

    Repeated Alternator Failures on a Power Plant rated for 16MVA /11,000V using 12x 415V Generators.

    Hi Warross, The alternators are provided with anti-condensation heaters and they are ON during idle condition. One of the alternators became okay as the cleaning (high pressure air) and drying (heating with flood lights) may have removed the dust or moisture or both bridging the exposed...
  9. vp1959

    Repeated Alternator Failures on a Power Plant rated for 16MVA /11,000V using 12x 415V Generators.

    Hi DJS & Catservengg The system is running on island mode and feeding a labor camp, major loads being air conditioners (split & package type mostly 3ph), kitchen equipments (electric cookers, ovens, mixers), lighting, television, etc. There was no vibration issue and no chance for high...
  10. vp1959

    Repeated Alternator Failures on a Power Plant rated for 16MVA /11,000V using 12x 415V Generators.

    I am seeking expertise review to identify the reason(s) for repeated alternator failure on an 11kV power plant rated for 16MVA using 12x 415V generators arranged as per the following, installed/ commissioned in two phases and operating all in parallel with necessary protection and load...
  11. vp1959

    Fire Fighting System Design

    Dear Sir, Hi Designers/ experts in Fire Fighting System The Fire Fighting System installed for a Construction Equipment Showroom, Spare Parts Store and Workshop facilities spread in an area of 7,500sq.m is provided with: 1) 2x electric driven fire pumps each rated for 1,000GPM/ 94kW 2) 1x...
  12. vp1959

    Fire Fighting System

    Hi Designers/ experts in Fire Fighting System The Fire Fighting System installed for a Construction Equipment Showroom, Spare Parts Store and Workshop facilities spread in an area of 7,500sq.m is provided with: 1) 2x electric driven fire pumps each rated for 1,000GPM/ 94kW 2) 1x electric...
  13. vp1959

    Construction and Material Handling Equipment from China

    Gents, Let us discuss about the Performance, Reliability (MTBF), Maintenance and Expected Life of Construction and Material Handling Equipment from China, as it would guide those are looking for cheaper option to substitute European brands, especially Mobile Cranes, Crawler Cranes, Tower...
  14. vp1959

    Fire detection & suppression for emergency generator room

    I am the one supplied the generators and customer provided the room Location is Kuwait
  15. vp1959

    Fire detection & suppression for emergency generator room

    Already insulated
  16. vp1959

    Fire detection & suppression for emergency generator room

    Could you please advice the appropriate fire detection and suppression system for emergency generator room? The generator room located in the basement is having 5x 1,700kVA emergency generators and engine room mounted emergency switchboard and control system arranged to start and load as per the...
  17. vp1959

    Why to use 4 Pole Breaker for Generator

    There are two sites: One ATS is contactor type, while the other one is motorized MCCB type: 4Pole type contactors and MCCB are provided with electrical and mechanical interlock and they breaks the neutral when changeover Please see the attached SLD for better understanding the application/...
  18. vp1959

    Why to use 4 Pole Breaker for Generator

    Thanks, What other information is required to conclude, as I have shown everything? The neutrals for the transformer and generator are solidly grounded and shown in the SLD. Yes, problems due to late neutral switching or failed neutral are possible, but it is common like phases (sometimes...
  19. vp1959

    Why to use 4 Pole Breaker for Generator

    See the attached SLDhttp://files.engineering.com/getfile.aspx?folder=e940eaab-2ed1-41a4-b6b6-ecd189f6aeff&file=SLD_4POLE_MCCB_ISSUE.pdf
  20. vp1959

    Why to use 4 Pole Breaker for Generator

    Dear all, Please see the attached SLD to know my concern, as no one answered my qusestions. What is the advantage of using 4pole MCCB instead of 3Pole MCCB for standby generator with neutral solidly grounded? It is mounted on the generator, always closed to start and feed the power through...

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