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Recent content by sabap

  1. sabap

    Affect of Weak Infeed & powe swing on distance relay

    Got it. Its been updated. I had the older version. Thanks.s
  2. sabap

    Cost Benefit Analysis for VSD with new motor installation

    I am in the process of making the cost benefit analysis for installation of VSD with new 2600 HP, 6.6 KV motor on boiler Feed Water Pump application. I have already received the cost of doing this job. The cnectrifugal pumps are driven by this motor. Pump capacity is 250 tph at 200 bar. Boiler...
  3. sabap

    Affect of Weak Infeed & powe swing on distance relay

    I dont know why but i could not open this website from our corporate network. Is this site still functional? ):
  4. sabap

    Affect of Weak Infeed & powe swing on distance relay

    How does the problem of weak infeed and power swing on t/line affects a distance relay? Does these have any particular problem with POTT scheme. How are they implemented. What is echo method for weak infeed problem elimination. I will also appreciate if anyone can give a brief description of...
  5. sabap

    Oil seepage from bearing into motor

    The motor is driving boiler feed water pump which is centrifugal. Important thing to mention here is that the air filters were being fabricated locally instead of buying from TECO. Maybe you guys have helped identifying the true cause. We will inspect for the equalization holes next week and i...
  6. sabap

    Serial to Parallel Converter PI-049A manual

    I need the manual for doing switch settings of serial to parallel converter PI-049A by Black Box.
  7. sabap

    Babelbox Protocol Converter Configuration

    Bailey INFI90 FDI (Foreign Device Interface) normally gives error codes for troubleshooting which you should verify by monitoring the module configuration using CADTXT or WIntools or Composer.
  8. sabap

    Oil seepage from bearing into motor

    Last year we opened up a 6.6 KV 2600 HP motor as the winding temperatures were nearing 150 C. Upon inspection we found that bearing oil from sleeve bearing had seeped into motor. Combined with small dirt particles, the sticky material was all over the windings and ari paths. Subsequently the...
  9. sabap

    20 times rated secondary current for CT?

    Why is the CT error specified in terms of 20 times rated sec current? What is the signifance of this number? Can be it be derived performing calculations on basic CT model? Thanks in advance
  10. sabap

    Protective relaying theory and application, Marcel Dekker

    I would like to thank all for the response to my question. Is there any latest edition, after 2000, of PRAG by Alstom or art and science of relays by GE? I was unable to open the areva-td.com site. I have managed to get the subject book. It looks good. I will study it in detail and see.
  11. sabap

    Protective relaying theory and application, Marcel Dekker

    How is this book as compared to PRAG from Alstom? I want to know others opinion on this books latest edition before buying it. THe other book in which i was interested in is power system analysis by the same author. Comments on this are also required. THanks in advance.
  12. sabap

    Fuzzy Logic Tuning

    Check this: http://www.iau.dtu.dk/~jj/pubs/fpid.pdf This article is on tuning of Fuzzy PID controllers. The other one, you can get through email.
  13. sabap

    Insulation Class?

    Reference standards IEC 34-1, BS4999, AS 1359.32 TEMPERATURE RISE AND MOTOR LIFE 'Life' refers to the life of the windings before they require rewinding. The temperature rise of the windings (and the insulation materials), of an electric motor is critical to the life expectancy of the motor and...
  14. sabap

    Boiler steam pressure setting vs. max. capacity

    On steam turbine units, operating the unit with lowest possible steam pressure helps in improving heat rate due to following reasons: 1. Lower leakages in the furnace/boiler which means low losses. 2. Turbine governer valves will remain close to full open which will result very low throttling...
  15. sabap

    Fuzzy Logic Tuning

    Check this article from University of Honk Kong's website. You can download it easily. Fuzzy PID Controllers for Industrial Applications G. Ron Chen Lecture for EE 6452 City University of Hong Kong
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