Protection process and control system for a gas turbine
First Claim
1. A process for protection of a gas turbine from damage caused by pressure pulsations, the process comprising:
- measuring pressure pulsations occurring during the operation of the gas turbine;
generating a pulsation-time signal from the measured pressure pulsations;
transforming the pulsation-time signal into a pulsation-frequency signal;
determining from the pulsation-frequency signal a pulsation level for at least one specified monitoring frequency band, wherein determining the pulsation level comprises determining from the maximum pulsation value in the monitoring frequency band;
monitoring the pulsation level for the occurrence of at least one trigger condition;
carrying out, when the at least one trigger condition occurs, a protective action; and
shifting the monitoring frequency band upon a frequency shift of the maximum pulsation value, to follow the maximum pulsation value, so that the maximum pulsation value remains within the monitoring frequency band.
3 Assignments
0 Petitions
Accused Products
Abstract
In a process for protection of a gas turbine (1) from damage caused by pressure pulsations (P), pressure pulsations (P) occurring during the operation of the gas turbine (1) are measured, from the measured pressure pulsations (P), a pulsation-time signal (PZS) is generated, the pulsation-time signal (PZS) is transformed into a pulsation-frequency signal (PFS), from the pulsation-frequency signal (PFS), a pulsation level (PL) is determined for at least one specified monitoring frequency band (12), the pulsation level (PL) is monitored for the occurrence of at least one specified trigger condition, and, when the at least one trigger condition occurs, a specified protective action (16) is carried out.
26 Citations
15 Claims
-
1. A process for protection of a gas turbine from damage caused by pressure pulsations, the process comprising:
-
measuring pressure pulsations occurring during the operation of the gas turbine; generating a pulsation-time signal from the measured pressure pulsations; transforming the pulsation-time signal into a pulsation-frequency signal; determining from the pulsation-frequency signal a pulsation level for at least one specified monitoring frequency band, wherein determining the pulsation level comprises determining from the maximum pulsation value in the monitoring frequency band; monitoring the pulsation level for the occurrence of at least one trigger condition; carrying out, when the at least one trigger condition occurs, a protective action; and shifting the monitoring frequency band upon a frequency shift of the maximum pulsation value, to follow the maximum pulsation value, so that the maximum pulsation value remains within the monitoring frequency band. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A process for protection of a gas turbine from damage caused by pressure pulsations, the process comprising:
-
measuring pressure pulsations occurring during the operation of the gas turbine; generating a pulsation-time signal from the measured pressure pulsations; transforming the pulsation-time signal into a pulsation-frequency signal; determining from the pulsation-frequency signal a pulsation level for at least one specified monitoring frequency band; monitoring the pulsation level for the occurrence of at least one trigger condition; and
,carrying out, when the at least one trigger condition occurs, a protective action examining, when a pulsation occurs, whether said pulsation is a harmonic of a pulsation from a lower frequency range; and monitoring an associated pulsation level only if the associated pulsation is not a harmonic.
-
-
10. A process for protection of a gas turbine from damage caused by pressure pulsations, the process comprising:
-
measuring pressure pulsations occurring during the operation of the gas turbine; generating a pulsation-time signal from the measured pressure pulsations; transforming the pulsation-time signal into a pulsation-frequency signal; determining from the pulsation-frequency signal a pulsation level for at least one specified monitoring frequency band; monitoring the pulsation level for the occurrence of at least one trigger condition; carrying out, when the at least one trigger condition occurs, a protective action; wherein the at least one trigger condition comprises a trigger strategy including a trigger counter (AZ) and a reset counter (RZ); wherein the trigger counter (AZ) comprises adding the time (t) during which the pulsation level lies above a specified level limit value (PLlimit) to the preceding counter reading; wherein the at least one trigger condition occurs and the specified protective action is started as soon as the trigger counter (AZ) reaches a specified trigger counter reading (AZlimit); wherein the reset counter (RZ) comprises adding the time (t) during which the pulsation level (PL) does not lie above the level limit value (PLlimit) to a counter reading that has been reset to zero; and further comprising setting to zero the counter reading of the trigger counter (AZ) as soon as the reset counter (RZ) reaches a specified reset counter reading (RZlimit). - View Dependent Claims (11, 12)
-
-
13. A control system for a gas turbine comprising:
-
a pulsation measuring device which includes and is configured and arranged to measure with a sensor the pressure pulsations occurring during the operation of the gas turbine and generates a pulsation-time signal (PZS) correlated with said pressure pulsations; a pulsation evaluation device configured and arranged to transform the pulsation-time signal (PZS) into a pulsation-frequency signal (PFS), determine from the pulsation-frequency signal (PFS) for at least one specified monitoring frequency band a pulsation level (PL), monitor the pulsation-frequency signal for the occurrence of at least one specified trigger condition, and when the at least one trigger condition occurs, generate a trigger signal; a control device configured and arranged to perform a specified protective action when the trigger signal is present; and a galvanically decoupled connection configured and arranged to transmit the pulsation-time signal (PZS) between the pulsation measuring device and pulsation evaluation device. - View Dependent Claims (14, 15)
-
Specification