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In valthur Gas Turbine power station has V 64.3A model ansaldo make GT. It has been tripped on surge protection tripping in many times due to grid frequencies variation from 50Hz to 49.2Hz. When grid frequency reduced from 49.65Hz to 49.2Hz, the load more than 52MW, the GT got tripped on surge protection.
As per logic If UP stm compressor of the DP switches 2 out of 3 below set value of 23mbar reached and GT speed above 4560, the GT got tripped on surge protection tripped occurred. Instrumentation side the following remedial measure has been taken. The above DP switches calibrated and their impulse line piping cleaned through instrument air, IGV calibrated and mechanical angle, bearing checked and found normal. But suction of the Up steam compr. DP transmitter value GT running 11.5mbar and compr discharge pr has been reads 1.5 bar. No variation at the time of surge protection tripping. Recently year 2014 6 times tripping has been occurred at the time anti impulsion door cannot opened as per trend shown.
pl explain and trouble shooting procedure and permanent remedial measuring report for avoiding of the above nonsense trip pl.
As per logic If UP stm compressor of the DP switches 2 out of 3 below set value of 23mbar reached and GT speed above 4560, the GT got tripped on surge protection tripped occurred. Instrumentation side the following remedial measure has been taken. The above DP switches calibrated and their impulse line piping cleaned through instrument air, IGV calibrated and mechanical angle, bearing checked and found normal. But suction of the Up steam compr. DP transmitter value GT running 11.5mbar and compr discharge pr has been reads 1.5 bar. No variation at the time of surge protection tripping. Recently year 2014 6 times tripping has been occurred at the time anti impulsion door cannot opened as per trend shown.
pl explain and trouble shooting procedure and permanent remedial measuring report for avoiding of the above nonsense trip pl.