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  1. P

    Generator Breaker Cannot Open

    CSA... In all years we have had discussions on this forum I have never, repeat never, impugned, scorned, or ridiculed your knowledge of the 'GT' part of GTGs. My discussions, based on "light-years" (to me) of education and experience, were only intended to enlighten those interested in...
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    Generator Breaker Cannot Open

    Hi CSA... First, I specifically addressed LoE, not LoI (Loss-of-Input). Secondly your "synch-gen'r operating w/o excitation... w/o prime mover input... while still connected to the grid..." characterizes an induction-motor, not an induction-generator. Regards, Phil
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    Generator Breaker Cannot Open

    CSA... you keep alluding to the LOE event causing the Alternator to operate as an induction-motor. That is not the case. It becomes an induction-generator, and it can.remain as such for several minutes! Regards, Phil
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    Main Causes for Negative Phase Sequence Occurring in Generator

    Barindra... Negative sequence is not "purely mathematical", but, in fact can be "mimicked." Phil Corso
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    Calculation of Power for 3 Phase Supply

    Gulabg... It can be readily calculated using only Voltage and Current magnitudes. All that is necessary is simple drawing of your setup, showing source arrangement, and load configuration. If you want to, send it to [email protected]
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    Generator Breaker Cannot Open

    Poom... the following Control.Com Threads will provide you with additional information, especially with regard to the LoE (Loss of Excitation) event: o http://www.control.com/thread/1026237146 o http://www.control.com/thread/1258378683 Regards, Phil Corso
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    Sizing Three Phase Induction Motor

    Krishnan... all you need are: a) Brake-Hp, of the driven-machine. b) its speed. c) duty-cycle => continuous, intermittent, other. d) its torque during startup must exceed that of the driven-machine. Regards, Phil Corso
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    Calculation of Power for 3 Phase Supply

    Gulabg... the specifics you provided, i.e., 3-ph delta, 120V, 240V, 90deg, and 180deg, are more associated with a 3-ph, 4wire, delta-connected, center-tapped (hi-leg) secondary distribution system. Can you provide a hand-drawn sketch of your system? Regards, Phil Corso
  9. P

    Looking for the Transfer Function of Radiator

    Zainy... go to... http://www.expertsmind.com/ Regards, Phil Corso
  10. P

    Generator Phase Distance Protection

    Greatmark... Distance-protection is not usually applied to Generator-protection. Are you asking, "Can a microprocessor-based relay with Distance-relaying capability be used for Generator protection?" Regards, Phil Corso
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    60 Hz converted to 50 Hz

    Rogerthat,,, As a start I suggest you obtain two threads from the Control.Com Archives: o Http://www.control.com/thread/1026249406 o Http://www.control.com/thread/1245027301 Regards, Phil Corso
  12. P

    Transformer Uto Tap Changer

    Ahdash... if you mean, "Can a manually operated tap-changer be switched automatically?", then the usual answer is... it is highly unlikely! Regards, Phil Corso
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    11kv Motor Failure Checks

    What was the problem?
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    11kv Motor Failure Checks

    Ahdash... before responding to your "Tap-Changer" post, how about a status report on this thread! Phil Corso
  15. P

    Grounding (again): VFD and Control cabling differences or similarities

    John, pls excuse the informality) you are correct! While the thread covered many "grounding" topics, as does your treatise, I specifically addressed one... metallic-shielded power cables. Regards, Phil Corso
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    Main Causes for Negative Phase Sequence Occurring in Generator

    Devish... I suggest to search Control.Com Archives using "Search the Site" box in the upper right-hand corner of each page. There are some 50+ "Negative Sequence" posts! Regards, Phil Corso
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    Static Starter LS2100e

    Niazbibiyan... I'm unable to connect with you via Boxbe. So my first question to you is... Are you familiar with calculation to determine motor starting or acceleration time? Phil Corso
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    PF in Generator Breaker Selection

    Barbican... your example works as long as the prime-mover has equal capacity! Phil
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    PF in Generator Breaker Selection

    WS32119... typically, CB selection is based on 1.25 x kVA rating! Its kVA rating, 40kW at 0.8 pf, is kW/pf equals to 50kVA! Thus, the generator's maximum current rating is 139A. How did you arrive at 158A? Regards, Phil Corso Barbican... you can only increase kW above rated if Genset...
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    Static Starter LS2100e

    Niazbibiyana... it is analogous to sizing an auto-transformer for motor starting. Simply put, it is sized to accommodate RMS value of kVA x time (or Amps if V is constant) during the starting period! Are you are interested the calculation detail? Regards, Phil Corso
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