GENSET TRIPPED WHEN BROUGHT ON SECOND COMPRESSOR

[TONY2023]

Hi All, I have a question. We have a 2.5MW, 13.8KV genset to provide power to two compressors. Each compressor is rated for 600HP, 460V. There is a 1500KW step down transformer between genset and compressors. The genset started up and provided power to first compressor without any issue or tripping. As they brought up the second compressor, genset got tripped in 20 seconds with negative KVAR. I did the calculation based on the above information, everything looks okay. The genset has enough capacity to handle the two compressors load.

I would like to get any feedback on how or what to check to solve this issue?

Thank you,
Tony

 

[waross]

If those motors are synchronous, they may be over-excited to correct plant power factor.
This would explain your symptoms.
That is; rather than measuring and responding to overall plant power factor the excitation may have been arbitrarily set at something like 0.8 or 0.9 leading as bulk correction.

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Ohm's law
Not just a good idea;
It's the LAW!