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  1. sakaran51

    Sallen Key Second order low pass Active filter-Butterworth and Bessel responses-Kc values.

    Of course, I went for this particular book for its conversational style and no prerequisite for higher mathematics background. Can you suggest a book or give me a link on this subject for better understanding?
  2. sakaran51

    Sallen Key Second order low pass Active filter-Butterworth and Bessel responses-Kc values.

    Thanks benta & IRstuff for saving me from any further confusion. Unfortunately I got tangled with a puzzle in a subject which is already complicated. I am not proficient in complex maths/imaginary numbers and I no have inclination for circuit analysis! I just wanted to understand the subject...
  3. sakaran51

    Sallen Key Second order low pass Active filter-Butterworth and Bessel responses-Kc values.

    Hi IRstuff, Please find the link for the book I was referring. In the chapter of Active Filters, the statement mentioned in my OP,is figuring. https://www.engineeringbookspdf.com/electronic-principles-8th-edition-albert-malvino-david-bates/
  4. sakaran51

    Sallen Key Second order low pass Active filter-Butterworth and Bessel responses-Kc values.

    Thanks benta. Let me first tell you that I was only trying to understand the active filter circuits. I am not familiar with filter circuits. It is a bit overwhelming. I got struck up with responses of Butterworth(if Q=0.707,then Kc=1) and Bessel (if Q=0.577,then Kc=0.786),as mentioned in the...
  5. sakaran51

    Sallen Key Second order low pass Active filter-Butterworth and Bessel responses-Kc values.

    Hi, I was going through a book on Electronic Principles on Active filters. While on the subject of Sallen-Key second order low pass filters,I came across the following statements: Butterworth and Bessel Responses "When analysing a circuit,we start by calculating Q and fp(pole frequency).If...
  6. sakaran51

    Baby BFP

    Littlech: Probably you maybe right.Instead of going for a customised design,to meet this particular duty, the pump vendor was offering his standard pump which calls for an increased speed. Thanks.
  7. sakaran51

    Baby BFP

    Hi Kindly excuse me for the delay in responding to the various comments,since I could not get the details readily. First and foremost,this small Boiler Feed Water pump will run not only during the power outage but during normal operation of the boilers along with Main feed water pumps of higher...
  8. sakaran51

    Baby BFP

    Artisi Pump has not yet been installed.It is a proposal for the project coming up.Will share more details shortly.
  9. sakaran51

    Baby BFP

    Hi I am not a pump engineer but basically an electrical engineer.I had come across a pump vendor who insists for a baby boiler feed water pump with a speed of 3350 RPM.It is used to maintain the water level in the boiler, during power failure when main BFPs could not be run due to DG capacity...
  10. sakaran51

    Generator Circuit Breakers for smaller machines

    As a corollary, there is a question arises,why IEEE STD C37.013a-2007 was introduced as an amendment for generator applications of 10 MVA onwards and NOT 50 MVA onwards?
  11. sakaran51

    Generator Circuit Breakers for smaller machines

    ScottyUK The above white paper from Eaton mention in one place, while comparing the parameters "Field experience has shown that the performance capabilities of some of the standard distribution class vacuum circuit breakers may well be adequate for the protection of smaller machines,rated below...
  12. sakaran51

    Generator Circuit Breakers for smaller machines

    ScottyUK By the way,I am also in IEC world and finding it difficult to arrive at cost effective & technically right solution.This especially true for smaller and cat on the wall rating machines! Thanks
  13. sakaran51

    Generator Circuit Breakers for smaller machines

    ScottyUK Yes I agree by increasing the relay time slightly the DC Component to be handled by the circuit breaker can be reduced within CB's capacity with its associated risks.But can we select an oversize distribution breaker in terms of short circuit breking current for smaller generators,say...
  14. sakaran51

    Generator Circuit Breakers for smaller machines

    Hi, According to IEEE Std.C37.013a-2007 for Generators ranging from 10-100MVA, MV/HV Generator Circuit Breakers(GCB)are recommended as against normal distribution circuit breakers used in industrial, commercial and utility systems.The GCBs have special features suitable for -high X/R ratio of...
  15. sakaran51

    Frequency conversion for Steam Turbine Generator

    Hi,Richard, We did look into the option of Static Frequency Converter option.But that was ruled out because of high prohibitive cost.Presently,it is decided to settle for a lower generator power output.And the speed will be reduced by adjusting the governor without changing the gearbox.
  16. sakaran51

    Frequency conversion for Steam Turbine Generator

    Thanks Strong.
  17. sakaran51

    Frequency conversion for Steam Turbine Generator

    Yes,Waross, Will try to get some info.from OEM.Thanks.
  18. sakaran51

    Frequency conversion for Steam Turbine Generator

    @ScottyUK Yes.They(NSDK-NISHISHIBA) are very much in the business of Generator,Control and Marine electrical systems.Awaiting response from them for our query.
  19. sakaran51

    Frequency conversion for Steam Turbine Generator

    @MikeL As I had already mentioned it is a Marine alternator with brushless excitation system.Make Nishishiba Electric Co.Japan.Mfr.Year 1976!Generator is having Air cooler with fresh water as coolant.As you suggest we will try to get some inputs from the manufacturer,hopefully.
  20. sakaran51

    Frequency conversion for Steam Turbine Generator

    Walt The speed will be reduced from 1800 RPM to 1500 RPM by means of a gearbox only.The turbine speed will remain at its original 6000 RPM and hence rotor vibrations may not occur. ScottyUK We would like to retain the same shaft mounted brushless exciter.However,since AVR cum excitation panel is...

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