Gas Turbine Fail to make firing in Gas Fuel

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anasdiab

I work in Combined Cycle Power Plant it includes 2x100MW GE frame 9E Gas Turbine and 1x100MW Fuji steam Turbine. we make shut down for unit GT1 for maintenance, and when we try to start it in Gas Fuel it make trip

our Gas Turbine can not make firing on Gas fuel because it trip on GAS LEAKE TEST FAIL, and we are sure that there is no leaking.

so, we start the unit on Liquid Fuel and after GT is Synchronized we make transfer to Gas fuel and it done completey.

My question is what is the real reason which make GT tripped if we used Gas Fuel on Starting?
 
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