Method for protecting a gas turbine engine against high dynamical process values and gas turbine engine for conducting said method

The invention relates to a method for protecting a gas turbine engine (10), comprising a compressor (11), a combustor (13) and a turbine (12), against high dynamical process values, especially in combustor/flame pulsations. An effective protection against high dynamical process values, especially in combustor/flame pulsations is achieved by providing the steps of o) measuring the pulsations of the combustor (13) with a suitable sensor (18), p) dividing the frequency spectrum of the measured pulsation signal up into pre-defined band pass sections, q) computing the rms (root mean square) of the signal for each band, r) weighting the computed frequency/frequency band rms with predetermined weighting factors, s) cumulating the weighted frequency/frequency band rms values to get a Pulsation Limit Criterion (PLC) value, t) comparing the PLC value with at least one reference value (23), and u) operating the gas turbine engine (10) according to the result of said comparison.