Recent content by Surya

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  1. S

    SGT300 Not producing 11KV, NO Excitation Permit Signal SS4

    You may check the speed of prime mover. Usually SS4 is a speed switch and when unit speed reached 95% then SS4 will activate.
  2. S

    Connecting of 2 different small grids at Offshore Oil and Gas Platforms

    Hi, At my platform we have total 8 no of Gas Turbine Generators for 2 grids like 4 GTGs on each Grid. In Grid-1: There are 4 no of GTGs of Siemens make TB5000 GTs and GE Alternators of 2.8 MW. Present load varies from 2.4MW to 3MW. So we are running 2 GTGS to meet the load demand. Control...
  3. S

    Paralleling of 2 different Power Supplies for DCS system

    Hi, At one of our offshore oil and gas platform, there were 3 110VAC-24VDC converters for DCS controllers and IOs. However, all there are supplying power to independent loads without any redundancy(Negative terminals are not connected to Ground). As these PS becomes old we are planning to...
  4. S

    Required analysis on SIPROTC relay oscilloscope data of Gas Turbine Generator

    Two days back while synchronising another GTG with busbar catering by 2 other similar GTGs fluctuation in electrical parameters occurred. below are the screenshots of one of the running GTG parameters. Kindly analyse and explain what was happened. Thanks
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    Unbalanced reactive power sharing of one Alternator on common bus of 3 Alternators

    Hey all... the issue I was mentioned above has been solved. we found the problem with wrong termination of "compounding CT" causing misjudgement by AVR about reactive power. Thanks all.
  6. S

    Unbalanced reactive power sharing of one Alternator on common bus of 3 Alternators

    yes. we checked the exited current and voltages. they are varying proportional to reactive power shared by that generator
  7. S

    Unbalanced reactive power sharing of one Alternator on common bus of 3 Alternators

    CRA At an Oil and Gas supplier offshore platform, we are facing one problem with our GE alternator which was recently came back after rotor rewinding. At our plant we have 3 alternators of same rating of 3500 KVA at 0.8 pf lag and same capacity, all are running by Gas Turbines. all are equipped...
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