Non-contact method for monitoring turbine blade particular individual steam or gas turbines in power system and system thereof

摘要

The method of contactless monitoring of turbines, particularly static and dynamic parameters of individual blades of steam or gas turbine power plants where turbine comprises one or more paddle wheels mounted on a common shaft . Turbines in operation senses the position of non-contact rotating blades during their passage in the vicinity of at least one sensor ( 2 , 3 , 4 ) , situated on the static part of the turbine impeller outside the periphery thereof , and at least one sensor ( 1 ) the reference marks on the rotating the turbine shaft , and also takes away the time of their passage in the corresponding sensor . The recorded data is digitized , processed and stored in binary form files as carrying time information with a resolution of 10 ns , information about the events of the time and pulse -shaped blade . The selected number of revolutions of the turbine is processed always contiguous block of data and performed the statistical analysis thereof , when time data generated by crossing blades around various sensors ( 2 , 3 , 4 ) are transformed into normalized vectors , describing the sequence of transitions of the blade around the downstream sensors , with the reference marks on the turbine shaft is calculated time difference with regard to the next reference mark , thus eliminating non-uniformity of rotation of the turbine shaft . Observed values are normalized according to the current speed and turbine circuit and performs the correction for the time lag , caused by a different blade shape pulses , the time difference of the blades is converted to instantaneous deviations from the mean position and analyzed .