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Gentlemen, At our project we have

Gentlemen, At our project we have

(OP)
Gentlemen,
At our project we have chillers 90tons cooling capacity ,i supplied it with power from 1600kva transformer 20/0.4kv,50HZ,6.4, oil type
there are another residential 1000amps
Load connected to the transformer ,according to my study the required cable size for 80m length from the TR to the chiller panel is 3*150+95NYY for each chiller ,the problem is that:since each chiller has 4 compressors and it start and stop frequently it
Trips ,should i increase the cable size?the maximum current drawn by one chiller(compressors running) is
200amps , MY guise is that : upon compressor starting, there will be a big voltage drop, and the chiller controls will dictate the compressor contactor to trip and always i get the alarms T51 an T55 as attached.
Thanks in advance

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