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  1. NickParker

    Console flushed into bulkhead

    Can the console can be flush with the bulkhead without any maintenance issue (snapshot below)?
  2. NickParker

    Diesel Generators - Parallel operation

    Diesel Generator - 1 & Diesel Generator - 2: Capacity: 3.5MW Engine: Daihatsu Alternator: Leroy somer (Nidec) Speed controller: Woodward UG25+Actuator / 2301E governor AVR: D700 (Nidec) Diesel Generator - 3: Capacity: 1.25MW Engine:Cummins QSK50 Generator: Leroy somer (Nidec) Speed controller...
  3. NickParker

    Tie Breaker in Series and Bus duct

    It is a low voltage; 690V
  4. NickParker

    Tie Breaker in Series and Bus duct

    The Bus A and Bus B receives power from their transformer; it is a Main-Tie-Main arrangement; Bus tie always operated in "Normally open" but has momentary parallel for Auto transfer.
  5. NickParker

    Tie Breaker in Series and Bus duct

    We have a space constraints preventing a long switchboard, so we want to segregate the switchgear by sections Bus A and Bus B as shown in the below figure. The questions are, 1) The link - to be connected by cables or bus ducts (distance less than 10 meter) 2) Should I have bus tie breaker at...
  6. NickParker

    Emergency Generator

    The diesel generator capacity is around 1250kW, but why would emergency generator is operated in droop mode as it is not to be tripped in some cases say, in sailing condition on a ship.
  7. NickParker

    Emergency Generator

    As far as I know, Emergency generator operating as a standalone unit, would be operated in Isochronous mode always. Recently a chinese vendor came up with a proposal that it always it is operated in droop mode. Is it the case? because in emergency mode, when some motors are started, then speed...
  8. NickParker

    Surge diverter in RTD terminal box

    What are these "SD" in the RTD terminal box of a Ex proof motor? Is it "Surge diverter". Why is it provided?
  9. NickParker

    Electrical power system protection - book

    This picture is from the book, Protection of generators, transformers, generator-transformer units and transformer feeders. Authors: J. Rushton and K. G. M. Mewes
  10. NickParker

    Harmonic Voltage factor and THD

    How do you relate the HVF (Harmonic voltage factor) mentioned in IEC 60034-1 and the Total Harmonic distortion?
  11. NickParker

    API 546 - Sealed winding conformance

    The specification states: "The insulation system shall be completely sealed per API 546." Generators manufactured to IEC 60034 are easier to procure, have shorter lead times, and are less expensive compared to those built to API 546. I understand that the testing requirements under API 546 are...
  12. NickParker

    Gas tight cables - Gel as filler

    This is my first time about the gas-tight cables that contain gel as a filler to block gas, specifically for use in hazardous areas. Could you please share any insights or potential drawbacks to using these types of cables? - Are there any known cons or challenges associated with them? - Does...
  13. NickParker

    Reactance and Time constant tests for a generator

    one of the manufacturers tell me that, they only intend to perform tests for direct-axis reactances, but not for quadrature-axis reactances, zero-sequence and negative-sequence reactances, open circuit time constants. What could be the reason for this?
  14. NickParker

    Reactance and Time constant tests for a generator

    How important is it to conduct tests for sub transient reactance, transient reactance, and time constant determination? At what point — in terms of generator capacity and application — are these tests required to be performed by the manufacturer? The case in point is of around 5 MVA diesel generator
  15. NickParker

    Paralleling dissimilar Generators

    But this risk can be eliminated by adopting the power factor mode (AVR) / Fixed power mode (Governor controller) for fast acting governor. Correct?
  16. NickParker

    Optimal value of Sub transient reactance - Generator

    What is the impact of sub transient reactance value of generator with respect to harmonic loads for an isolated system? and how to select the optimal value? Since this is a long lead item, and with no VFD details at hand, the harmonic studies are yet to be performed, is it typical to go for X’’d...
  17. NickParker

    Paralleling dissimilar Generators

    This is a small ship board system. (3 Diesel generators + 1 steam generator + 1 Emergency generator)
  18. NickParker

    Paralleling dissimilar Generators

    We have three essential diesel generators, one non-essential steam generator, and one emergency diesel generator. All these generators should be capable of operating in parallel when required, either in response to specific situations or for periodic testing as per the specification.
  19. NickParker

    Paralleling dissimilar Generators

    It's a combination of medium-voltage and low-voltage generators, with a step-down transformer (MV/LV) in between.
  20. NickParker

    Paralleling dissimilar Generators

    What factors should be considered when operating generators in parallel when they have different pole configurations and different prime movers (high-speed vs. low-speed), but maintain the same electrical frequency? Specifically, what challenges might arise when running large diesel generators...

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