Measurement method and device for determination of state of electric igniter of gas turbine burner, as well as ignition device for gas turbine burner

FIELD: power industry.

SUBSTANCE: proposed method consists in the fact that the time-dependant signal that characterises the ignition current of igniter (14) is compared to upper limit value and lower limit value, and at the same time, the characteristic signal is compared to average value of the specified current, relative to which the ignition current shall randomly oscillate at igniter (14) in operation.

EFFECT: monitoring of the gas turbine ignition process, thus preventing unsuccessful start-up of gas turbine.

24 cl, 3 dwg

The invention relates to a method of determining the state of the electrical igniter burner of a gas turbine, in which the first stage compare time-dependent data describing the current ignition igniter signal from the upper limit value and lower limit value. In addition, the invention relates to a measuring device for determining the state of the electrical igniter burner of a gas turbine containing the sensor to trigger on time determine current electric igniter burner gas turbines and associated with the sensor device evaluation with at least one memory and at least one means for comparison provided by the sensor signal with at least one stored limit value. In addition, the invention relates to an ignition device for a gas turbine containing an igniter containing two located opposite one another electrode, and between these electrodes can generate a spark ignition, and the ignition transformer to generate a voltage ignition, and the ignition transformer on the secondary side electrically connected to the electrodes.

The invention concerns a burner igniter of a gas turbine is known, for example, from EP 1892474 A1. Described that the igniter contains control the burner, which with the help of the igniter can be ignited as soon as through the control of the burner in the combustion chamber of the gas turbine flows flammable gas or combustible mixture of substances. Known from there the igniter contains essentially two parallel to each other electrode plugs that are in the area of production of the fuel burner control curved towards each other and there are minimal distance between them, so that in the area of release of fuel to have the possibility of formation of a spark plug, which can be ignited fuel or mixture. Typically, for the formation of a spark ignition to both electrodes is applied a relatively high AC voltage, which is provided by the ignition transformer. The ignition voltage can be up to several kilovolts (kV).

Damage or bending of one or both placed in the control burner ignition electrodes during transportation or installation may affect the functionality of the ignition electrodes. In addition, due to thermally caused by sprains, cracks may appear in isolation of the electrodes of the ignition or the ignition electrodes can in the worst case to break, so, despite the applied voltage ignition, the igniter is placed in the release of fuel burner control, does not provide the AET of forming a spark plug. Similarly, it is possible that after the so-called flushing compressor electrodes to the same wetted with a liquid for washing of the compressor, which also prevents spark plugs, despite the applied voltage ignition, due to the emerging currents of surface leakage. These defects can lead to undesirable and possibly dangerous for a gas turbine unsuccessful runs.

To control ignition and spark ignition is known device described in US 4760341. The device controls the duration and the amplitude of the ignition spark, and a negative portion of the waveform of the spark discharge. The condition of the igniter or the ignition spark is recognized as a relevant regulations, if the duration of the ignition spark does not exceed the maximum time that the amplitude of the ignition spark has a minimum value, and simultaneously the negative part exceeds the acceptable minimum value. The disadvantage is that this device is not suitable to control the process of ignition for gas turbines.

In accordance with this object of the invention is to provide an ignition device for a gas turbine, whereby the state of the electric igniter burner of a gas turbine can be determined in a simple and reliable way. Another is adaca of the invention is to propose an efficient way to determine the status of the electric igniter burner of a gas turbine and a measuring device, to prevent unsuccessful launches of gas turbines.

Aimed at the way the problem is solved by a method with the characteristics of paragraph 1 of the claims. Aimed at the measurement device, the task is solved in such a device according to paragraph 11 of the claims, and directed to the ignition device, the task is solved in such a device according to paragraph 13 of the claims.

In General, the basis of the invention lies in the knowledge that when the ignition igniter burner of a gas turbine on its edge occurs, the ignition spark, like an electric arc, the amount of current which has a specific value. As before opening the fuel valve control burner or main burner of a gas turbine must be a minimum duration of the ignition spark at the igniter, control proceeding with the current ignition allows you to install, what is the status of the electric igniter burner of a gas turbine. Corresponding to the invention the method provides that at the first stage time-dependent data signal characterizing the current ignition of the igniter is compared with the upper limit value and lower limit value to determine whether the igniter is unhealthy or healthy. In addition, it is proposed that the other one is a belt running phase characteristic signal is compared with the average value of the specified current. Further, in the basis of the invention lies in the knowledge that the current ignition and accordingly the magnitude of the signal characterizing the current ignition, not only must lie within a predetermined range of tolerances, but that flowing during the duration of the ignition spark current ignition must also oscillate about the average value of the set current, due to the flicker of an electric arc or spark. Therefore, controlled not only the current value of the ignition on exceeding or falling below the minimum/maximum values, but the time response of the current ignition to determine whether the igniter is working or not. If you do not get installed when working device ignition current of the ignition, oscillating about the mean values of a given current, the corresponding ignition device is unusable.

Thus, in accordance with the invention, the actual current of the ignition explores not only relative to the upper-limit value and lower limit value at the first stage, but also relative to the mean value around which this current, usually randomly varies in a healthy igniter.

If the ability of the ignition of the igniter was degraded under the effect the meters of water, there may be a short circuit or even surface leakage currents that result in a constant flow of current, which, thus, does not change around the mean value of a specified current, however, in the circumstances, may be within the range of tolerances. Due to short circuits or surface leakage currents between the edges of the electrodes does not occur, the ignition spark. Could also be that the ignition spark does not occur at the tip of the electrode, or in the area between the electrode and the casing of the gas turbine. However, this spark ignition is in an environment where it cannot be influenced by the air mass flow of the compressor, so that the signal that changes relative to the mean value of the set current is absent. Also, this defect can be recognized as such by the proposed method.

Through the application of the relevant invention and method corresponding to the invention the device is ready to run gas turbines additionally improved because on the basis of knowledge about the condition of the igniter or igniters are prevented launch failures due to defective or unhealthy igniters. Measures to eliminate the possible time of the failure of the igniter and/or repair of defective devices can then spend the belt, not bringing them to the unsuccessful launch of the gas turbine.

The upper limit value and lower limit value and/or the average value of the specified AC are respectively time-dependent. Therefore, time-dependent upper and lower limit values form an envelope curve of a given current, and dependent on the time average value of the specified current - characteristic trend of the specified current. This is of advantage especially in the case when while providing spark ignition (equivalent to the duration of the ignition) the environmental conditions of the spark plugs changed, which also entails a change in the current ignition. This is especially the case when the ignition spark should be provided at the time of changing the number of revolutions of the rotor of the gas turbine, so as a result of changing the number of revolutions of the rotor also changed the intake of the compressor air mass flow. Changing duct air masses leads to a change in flowing past the igniters air volume. Due to this effect on the spark plugs, which affects the amount of current of the ignition. Therefore, it is appropriate to changing boundary conditions ignition spark to set variables and, thus, time-dependent limit values or average the e values in the way that which compares the current ignition or a signal characterizing the current ignition.

Based on the growing number of revolutions of the rotor during acceleration of the gas turbine, even before starting the gas turbine, that is, before the burning fuel increases the air mass flow, which is directed to the burners along the burner, so that existing spark ignition is affected by air thrust, resulting in lower current ignition.

Preferred options for implementation are listed in the dependent claims.

According to a preferred implementation of the invention, the condition of the igniter is defined as unhealthy if the characteristic signal during the first minimum duration lies outside of the interval formed by the upper limit value and lower limit value. In accordance with this exceeding the upper limiting value or fall below the lower limit value specified by the current value only then should result displayed for the operator the message "the igniter inoperative when the current ignition for a minimum period of time, preferably three seconds, lies outside the specified interval. Thus should be excluded accidental faults and false indication. It is also possible for the secret of this interval to define a more narrow, than in a way that does not control the duration fall below or exceed the appropriate limit values.

According to a particularly preferred method, the condition of the igniter is defined as unhealthy if the characteristic signal during the second minimum duration varies relative to the mean value of the set current or the characteristics of the trend of the specified current. On the basis of current on the ignition of accidental ignition spark and the surrounding air flow, the condition of the igniter may be recognized as invalid, if this randomness in the current ignition absent during the second minimum duration, preferably three seconds. In other words: the average value of the specified current or characteristic trend given the current traveler, usually located in the middle between the upper limit value and lower limit value, is the value against which randomly fluctuates actually installed the current ignition if the ignition spark is provided in prescribed positions of the ignition the two electrodes of the igniter. If, for example, on the contrary, due to the breakdown of control electrode or defect in the insulation of the electrode occurs, the short circuit current through the burner, what about the oscillating characteristic of the current relative to the mean value of the set current or the characteristics of the trend of a given current is absent, that indicates a faulty igniter. In this respect, the control of the actual characteristics of the current presence of random current fluctuations, oscillating about the mean values of a given current or characteristics of the trend of a given current, provides, in particular, effective control of observation, by which the condition of the igniter can be determined particularly reliable manner.

To determine a relatively low current ignition, it is preferable if the current of the primary side of the ignition transformer is defined as the current ignition if the ignition transformer is provided for forming the ignition voltage of the ignition electrodes. This enables the use of commercially available, spatially compact sensors such as current transformers, transducers measured current or sensors on the Hall effect.

Instead of or in addition to the comparison, whether or not in fact occur, the current ignition varies within the envelope curve of a given unit can also run a benchmark comparison with the characteristics of the current to determine whether a controlled igniter is working or not. With this purpose, the pre-determined reference characteristic (pornyear) current ignition after turning off the gas turbine, that is, after stopping the feed of fuel to the rotating rotor. At this stage, the igniters are fired and within a specified time interval, for example 10 seconds, the characteristic of the current igniter is measured and stored. The reference sample can then be compared with the characteristics of the current ignition, which are determined before starting the gas turbine.

The preferred way way to determine the condition of the igniter is performed during rotation of the rotor of a gas turbine or before starting of the gas turbine. Thus it is possible to reduce the length of time before starting the gas turbine, as during acceleration, but not yet in a state of ignition of a gas turbine checks on the operation of the igniters.

Usually during acceleration of the gas turbine changes the number of revolutions of the rotor. As a rule, it is constantly increasing. In order to determine the boundary conditions that affect the spark gap or spark plugs, it is suggested to determine the characteristic of the current working igniter, which is determined by the characteristic trend of the specified current. To ensure that a workable igniter is controlled in the dry state, the definition of the characteristics of the current, which lies at the basis of the characteristics of the trend of a given current, which should be performed after disconnecting the gas turbine. For certain values of the first, preferably interpolated using a polynomial, which can determine the expected value for a given current in the quality characteristics of the trend, for which in reality varies the current in the ignition. Since the number of revolutions of the rotor remains constant, can, thus, determine the average value of the specified current.

According to another preferred method corresponding to the invention, each igniter of a gas turbine is tested for performance, which implies the number of working igniters for gas turbines. If the number of working igniters lies below the minimum number of working devices, and this minimum number is less than the number of igniters or burners, it is possible to waive the initiation of starting of the gas turbine, which causes the fuel to the burners is not unlocked directly. If, for example, the minimum number of working igniters after an offline washing of the compressor is not achieved, it is proposed to perform the drying of igniters through the preheating process. Then you may follow the next attempt starts. At the same time it is also possible, after the execution phase pre-heating,re-check each igniter in order to establish whether there is a sufficient number of working devices. This method offers - regardless of the method used to determine the condition of the igniter - especially for a gas turbine with an annular combustion chambers, in which a number of burners are communicated with a common combustion space, whereby the ignition is not activated burners can also be caused by the flame directly adjacent the respective burners.

Other advantages and features of the invention ensue from the following description with reference to the drawings showing the following:

Fig. 1 is a schematic plan of the ignition device with the measuring device,

Fig. 2 - time response of the current ignition during the interval ignition igniter burner of the gas turbine when the number of revolutions of the rotor corresponding to 2 Hz, and

Fig. 3 - time response of the current ignition timing during acceleration of the gas turbine.

In Fig. 1 schematically shows the device 10 of the ignition, and the device 12 measurements to determine the status of the electric igniter 14 of the burner of the gas turbine. The device 10 ignition contains the igniter 14, with two located opposite each other with the electrode 16, and between the edges 20 of the electrodes may form 22 spark plugs due to the butts is aemula to the electrodes 16 of the ignition voltage. Both electrodes 16 are electrically connected with the secondary winding of the transformer 24 ignition. The primary winding of the transformer 24 ignition connected with switchable source 26 AC voltage and in series with the transformer 24 ignition included Converter 28 of the measured current as a gauge by which to determine the signal characterizing the current ignition primary side, for further processing. However the output of the primary side of the ignition transformer through a switch electrically connected with the phase L, the other output of the primary side of the transformer 24 ignition through a transformer 28 of the measured current is connected to the neutral N. the electrodes 16 can, for example, be the electrodes of the igniter control burner or main burner of a gas turbine through which the combustible gas, the combustible mixture of fuel gas with air or oil-air mixture may be ignited while ensuring sparks 22 ignition. In particular, both the burner and the electrode 16 can be made according to European patent application No. 06017534.6 (published as EP 1892474 A1). The signal characterizing the current ignition is issued at the output 30 of the Converter 28 of the measured current, as only the source switch 26 AC voltage is closed. This characteristice the cue signal can then be fed to a block 29 evaluation which contains mainly three sensors 34, 38, 42 limit values, three schemes And 50, 57, 53, four blocks 48, 60, 72, 80 time functions and scheme OR 54.

More specifically, the output 30 of the Converter 28 of the measured current is connected to the input of the first sensor 34 limit values. In addition, the output 30 is connected to the input 36 of the second sensor 38 limits and to the input 40 of the third sensor 42 limit values. The output 44 of the first sensor 34 limit values connected to the input 45 of the first circuit 50, the output 59 which through the inlet 46 of the block 48 time functions and its output 50 is connected to the input circuit 52 OR 54. The output 47 of the second sensor 38 limit values connected to the input 67 of the second circuit 57, the output 69 which through the inlet 58 of the second block 60 time functions and its output 62 is connected to the input 64 of the scheme OR 54. The output 49 of the third sensor 42 limiting values through a third scheme And 53 and its output 66 via the input of inverter 68 is connected to the input 70 of the third block 72 time functions, the output 74 which is connected to the input 76 of the scheme OR 54. In addition, the output 66 of the third circuit or 53 is connected to the input 78 of the fourth block 80 time functions, the output 82 of which is connected to the fourth input 84 scheme OR 54. Three schemes And 50, 57, 53 provide as a blocking control that controlled the current ignition can be compared with the stored limit values TNA is nogo current (average value DC) under the same environmental conditions and run at comparable points in time. The inputs 39, 55 schemes And 50, 57, 53 this purpose includes corresponding signals to state the number of revolutions more than 5.5 Hz" and "ignition on". With the condition that the number of revolutions of the rotor more than the limit speed of 5.5 Hz (=5,5 Hz×60 sec=330 min^-1), can be checked whether the gas turbine during starting (the number of revolutions of the rotor less than 5.5 Hz) or not. The output 93 of the scheme OR 54 is indicated to the operator of the gas turbine. If there is a signal of logical "1"state corresponding igniter 14 is indicated to the operator as not workable. If immediately before the test was not conducted offline washing of the compressor, it indicates a defective igniter 14.

At a speed of 6.2 Hz voltage wiring ignition ("ignition on") with switchable source 26 AC voltage on the transformer 24 ignition starts way to determine the condition of the igniter 14, with this point in time in each of the sensors 34, 38, 42 limit values are compared. The signal provided by the Converter 28 of the measured current at its output, and which represents the current ignition primary side is controlled by the first sensor 34 limiting values in connection with block unlock by circuit 50, and the first block is ω 48 time functions. In the first sensor 34 limit values stored in at least the upper limit value, which is compared with the existing at its input 32 signal. The first limit is the maximum allowable current for the current ignition. If the valid signal is above the first limit value, the output 44 of the first sensor 34 limit values have a logical signal "1", which through the scheme And 50 from the first block 48 time functions is transferred to its output 50, if the signal is logical "1" is continuously applied for a minimum duration, for example, three seconds at the input of the first block 48 time functions.

The second sensor 38 limit values, the second circuit 57 and the second block 60 time functions work in a similar way, with, however, characterize the current ignition signal applied at the input 36 of the second sensor 38 limit values, is compared with the stored second sensor 38 of the limiting values of the second limit value, and the second sensor 38 limit values provides a logical signal "1" at its output 47, if the characteristic signal is below the second limit value. The second limit is the minimum allowable value of current in the ignition.

Through the second scheme And 57, and the second block 60 time functions with the persecuted logical "1", provided at the output 47, served on a schema OR 54, if he has been there for a minimum duration, for example, three seconds at the input 58 of the second block 60 time functions.

The third sensor 42 limit values works in conjunction with the third circuit And 53, the inverter 68 and the third and fourth blocks 72, 80 time functions similar way. The output 74 of the third block 72 time functions and the output 82 of the fourth block 80 time functions carried out, respectively, the logical signal "0"if the characteristic of the signal at the input 40 of the third sensor 42 limit values for no longer than the minimum duration, for example, three seconds, continuously exists above or below the third threshold value stored in the third sensor 42 limit values. The third limit value corresponds to the average value of the specified current, which lies in the middle between the upper and lower limit values. Existing at the inlet 40, the signal must, therefore, fluctuate around a third limit value, outputs 74, 82 of the third and fourth blocks 72, 80 time functions always have a signal of logical "0". If oscillating around a third limit value characteristic of current no longer than three seconds, then one of both of the blocks 72, 80 time functions produces a signal is logicheskoi "1".

The output 93 of the scheme OR 54 can then be recognized by the state of the igniter 14, and when the signal of logic "1" state of the igniter 14 is defined as not working, and when issuing a logical signal "0" as a workable state.

When this limit value stored in the three sensors 34, 38, 42 limit values, can be time-dependent, with the maximum value stored in the first sensor 34 limit values, forms the upper limit value of the envelope curve of the specified current limit value stored in the second sensor 38 limit values, forms the lower limit value of the envelope curve of the specified power limit value stored in the third sensor 42 limit values represents the average value of the specified current, relative to which usually varies the current to the ignition, if there is a workable igniter 14 and the ignition voltage on the edges 20 electrodes generates 22 spark plugs. In this regard, the first and second sensors 34, 38 limit values designed as a comparator limit values, and the third sensor 42 limit values as a comparator, which at its input 40 controls the current and describing the characteristics of the alternating current ignition signals for the presence of a fluctuating characteristic is eristic.

In Fig. 2 shows an exemplary characteristic of the current through operable igniter 14 of the burner of the gas turbine. In accordance with this abscissa plotted the time and on the y - axis the current ignition or the value of the characterizing signal.

In Fig. 2 determined by the Converter 28 of the measured current actual characteristic of the current represented by line 43. presents characteristics of the 43 current reflects the example of the characteristics of the current, which occurs when a healthy igniters 14.

The characteristic of the current was determined with a particularly small number of revolutions of the rotor, for example, 2 Hz, which occurs before the start. A value of 2 Hz corresponds to the value of 120 revolutions per minute for the number of revolutions of the rotor. Owing to the relatively low number of revolutions of the rotor of a gas turbine relating to the gas turbine compressor sucks a relatively small amount of air, causing the air pumped through the burner and through the turbine, has no significant impact on the 22 spark plugs on the edge 20 of electrode 16. If appropriate to the invention the method is performed with such a low number of revolutions of the rotor, it is possible to work with constant time limit values.

The method involves the use of three thresholds. When this first limit value, which also motobiznesa as the upper limit value, represents the maximum permissible current of the ignition of the igniter 14. The top characteristic limit values in Fig. 2 presents the dash-dotted line and provided with a reference position 31. The top feature 31 limit values according to Fig. 2 shows the continuous time limit, which may be stored in the first sensor 34 limit values.

The second limit value, which may also be referred to as the lower limit value, represented by the dashed line. Continuous time limit according to Fig. 2 presents through the bottom features 41 limit values. The upper limit value 31 and the lower limit value 41 is formed in this envelope curve of a given current or interval, which is really emerging current of the ignition when working igniter 14 should be at a low rotational speed of the rotor. Third, is also constant in time limit, which represents the average value of the specified current, shown in Fig. 2 by the dashed line 51.

Owing to the relatively low number of revolutions of the rotor influence flowing past the ends of the electrodes 16 air 22 spark plugs are relatively small, so that the sensors 34, 38, 42 limit values can be monitored operability with the existing igniter at constant marginal values 31, 41, 51.

As the 22 spark ignition of the igniter 14 is created as an electric arc, the current ignition and characterize its signal varies relative to the third limit value 51, which is in the middle between the upper and lower limit values 31, 41. If not set randomly oscillating relative to the third limit value 51 feature 43 current for the current ignition, it indicates a malfunctioning igniter 14.

Fig. 3 shows a diagram similar to Fig. 2, where the abscissa shows plotted the time and on the y - axis the current ignition. The chart presents the first, now dependent on the time limit is 31. Reference position 41 marked the second, also dependent on the time limit, which is valid lower bound for the current ignition depending on time. This time-dependent upper limit 31 and time-dependent lower limit value 41 form an envelope curve for a given current, which may change actually occur, but random in magnitude current of the ignition, when the igniter 14 is workable. In the middle between the upper limit value 31 and the lower limit value 41 runs parallel to them characteristic 51 trend however what about the current also its size is dependent on time.

If appropriate to the invention a method for determining the state of the electrical igniter 14 of the burner of the gas turbine is performed during acceleration of the gas turbine, in which the number of revolutions of the rotor is constantly increasing, with the help of the now time-dependent limit values, you can offer additional advanced way to control the igniter 14. Due to the constant increase in the number of revolutions of the rotor, which is driven by an external torque device, the amount of intake air during this compressor is continuously increasing. When this suction air compressor also partially passes by the igniters 14 of the burner of the gas turbine, so that the environmental conditions for spark ignition with increasing directed the air volume is also constantly changing. Due to changes of environmental conditions for sparks 22 ignition, also changes its current ignition. In order, despite the acceleration of the gas turbine from a low number of revolutions of the rotor, for example, 2 Hz, and the higher the rotor speed, for example, 7.2 Hz, for ten seconds, to be able to check the igniter 14 on the performance of the underlying method limit value 31, 41, 51 in the form dependent on the time values stored in the sensors 34, 38, 42 limit values and form the basis of the continuously running them in comparison. And here are the time when the switch switchable source 26 AC voltage to the transformer 24 ignition is the ignition voltage.

The definition of limit values, 31, 41, 51 may be, for example, after disconnecting the gas turbine, with a corresponding number of revolutions of the rotor. To do this, once or repeatedly executed test the ignition during starting of the gas turbine, when all valves fuel shut and out of the outlet holes for the fuel is not supplied fuel mixture or fuel. For the duration of the test plug is determined characteristic of the current ignition, which by interpolation using a polynomial of the third degree can be determined characteristic trend of the specified current. By identifying several characteristics of the trend of the specified current and due to their averaging may be excluded other random effects. The upper limit value or the upper characteristic 31 of the limit value and lower limit value or the lower characteristic 41 limit values can then be determined by simple parallel shift, i.e. by adding or subtracting allowable discard the Oia current to power the ignition.

Instead of comparing, lies whether actual current ignition inside the envelope curve and varies regarding whether the trend value, you can also perform a comparison with the sample (standard) characteristics current to determine whether controlled through the device 12 measuring the igniter 14 is operable or not.

In accordance with this, the device 12 dimensions, alternate block 29 evaluation of, or in addition thereto, may contain a device 13 for the reference control. The signal Converter 30 of the measured current that characterizes the current ignition, can be connected to the input 61 rewritable memory 63 values. Using elements 65 multiplying the current value stored in the memory 63 of values, or values that represent a specific characteristic of the current multiplied by the factor F, if should be further comparison of the stored values with the actual characteristic of the current, which was determined by a different number of revolutions of the rotor, than that which was determined values stored in memory values.

To determine the reference characteristics (reference sample) current ignition is determined after shutdown of the gas turbine (gradual stop). Transformer 24 ignition then a constant number of revolutions of the rotor 2 Hz, as soon as it is achieved, is included n the ten seconds. During this interval is continuously determined current ignition, and its characteristics as a time-dependent values stored in the memory 63 of values. To preserve the existing input X1 values, at this time, the input I1 of the memory 63 of the values of the applied signal is a logical "1". Conditions to perform the condition of the existence of a logical signal "1" at the input I1 is connected through the circuit And 81: on input X is the conditions the temperature of the release of more than 100°C?", on input Z is the terms "ignition on?", and on input W is the result of conditions "rinse before this was not carried out?". Using this definition are characteristic of the current ignition operable igniter 14 when the so-called speed of rotation equal to 2 Hz, the rotor is guaranteed to dry conditions, as is sucked and held by the compressor air temperature is still above 100°C.

Reference comparison may, in particular, be performed after an offline washing of the compressor. Specified then the current ignition is supplied via a Converter 30 of the measured current at block 94 subtraction to certain currently current ignition to compare with the values stored in the memory 63 of the values as soon as the applied voltage ignition (Z=signal logical "1"), flushing is completed (W=signal log the parameter "1"), and again reached the speed of rotation (Y=signal logical "1") 2 Hz. Then at the output 95 of the block 94 subtraction is provided a differential value, which varies with respect to the zero point, if the characteristic of the actual current of the ignition and the characteristic of the stored current ignition similar, which indicates a healthy igniter 14. With the fourth sensor 96 limits of the inverter 97, the fifth block 98 time functions and the sixth block 99 time functions can be defined deviations from the zero line. If deviations on the one hand there longer than a predefined time interval, then the scheme or 100 through a signal logic "1" state of the igniter 14 is qualified as unusable.

If the ignition ability of the corresponding igniter 14 due to water penetrated for offline washing of the compressor, is adversely affected, you may experience a short circuit, which causes a constant current to flow, which varies relative to the trend line, and, under the circumstances, it may be much higher or lower than the lower limit value or upper limit value. Due to a short circuit, there is no ignition voltage generated at the edges 20 of the electrodes, which sparkle SAG Hania also missing. Moreover, there is no effect of the air mass flow, for which there is no alternating (alternating) characterization of the signal.

If, for example, a gas turbine equipped with multiple burners, each burner has a corresponding igniter 14 and the burner are connected with the common space of the combustion chamber in the form of an annular combustion chamber, the startup of the gas turbine, which is identified with the valve opening of the fuel can be canceled, if after rinsing programme found that so many igniters 14 due to humidity have a negative impact that is likely unsuccessful starting of the gas turbine. If this is the case of malfunction can be installed using the device 10 of the ignition, starting the gas turbine can be postponed. Then the electrodes 16 ignition due to pre-heating can be dried. Preheating may be implemented, for example, by including a transformer 24 ignition on the interval, for example, 30 seconds. Alternatively or additionally, by increasing the air mass flow (boiler blowdown) may be drying, probably still wet igniters. If you then re-test the ignition or test measurement detected a sufficient number of healthy is of igniters, for example, 76% of the number of igniters, gas turbine can be started without the risk of failed start due to problems with the igniters.

In General, the invention features a method for determining the state of the electrical igniter 14 of the burner of the gas turbine, as well as the device 12 measurement and the device 10 ignition for the burner of a gas turbine, whereby it is possible to prevent failure of the gas turbine due to unhealthy igniters. The method provides that the time dependent signal characterizing the current ignition of the igniter 14 is compared with the upper limit value and lower limit value, and simultaneously the characteristic signal is matched with the average value of the specified current, relative to which the current ignition when working igniter 14 should fluctuate randomly.

1. The method of determining the state of the electrical igniter (14) of the burner of a gas turbine, in which the first stage compare time-dependent data describing the current ignition igniter (14) the signal from the upper limit value and lower limit value, characterized in that
the characteristic signal describes the amount of current of the ignition, and in the next step, the characteristic signal is compared with the average value of the m predetermined current
the upper limit value and lower limit value, with the formation of the envelope curve of a given current, and/or the average value of the specified current, with the formation characteristics (51) trend given the current are, respectively, time-dependent.

2. The method according to claim 1, in which the condition of the igniter (14) is defined as unhealthy if the characteristic signal during the first minimum duration lies outside of the interval formed by the upper limit value and lower limit value.

3. The method according to claim 1 or 2, wherein the condition of the igniter (14) is defined as unhealthy if the characteristic signal during the second minimum duration varies relative to the mean value of a specified current or characteristics (51) trend given current.

4. The method according to claim 1 or 2, wherein for the formation voltage of the ignition electrodes (16) ignition includes a transformer (24) ignition, while the current of the primary side of the transformer (24) ignition is defined as the current of the ignition.

5. The method according to claim 3, wherein for the formation voltage of the ignition electrodes (16) ignition includes a transformer (24) ignition, while the current of the primary side of the transformer (24) ignition is defined as the current of the ignition.

6. The method according to any of paragraphs, 2, 5, at which the comparison performed by several benchmark comparisons of the characteristics of current.

7. The method according to claim 3, wherein the comparison performed by several benchmark comparisons of the characteristics of current.

8. The method according to claim 4, wherein the comparison performed by several benchmark comparisons of the characteristics of current.

9. The method according to any one of claims 1, 2, 5, 7, 8, which is performed during rotation of the rotor of a gas turbine or before starting of the gas turbine.

10. The method according to claim 3, which is performed during rotation of the rotor of a gas turbine or before starting of the gas turbine.

11. The method according to claim 4, which is performed during rotation of the rotor of a gas turbine or before starting of the gas turbine.

12. The method according to claim 6, which is performed during rotation of the rotor of a gas turbine or before starting of the gas turbine.

13. The method according to any one of claims 1, 2, 5, 7, 8, 10-12, in which the number of revolutions of the rotor is changed.

14. The method according to claim 3, in which the number of revolutions of the rotor is changed.

15. The method according to claim 4, in which the number of revolutions of the rotor is changed.

16. The method according to claim 6, in which the number of revolutions of the rotor is changed.

17. The method according to claim 9, in which the number of revolutions of the rotor is changed.

18. The method according to any one of claims 1, 2, 5, 7, 8, 10-12, 14-17, in which pre-determine the characteristics of the current working igniter (14), and the which determine the characteristics (51) trend given current.

19. The method according to p, in which the characteristic of the current working igniter (14) is determined after shutdown of the gas turbine.

20. The method according to any one of claims 1, 2, 5, 7, 8, 10-12, 14-17, with secondary stage determine the number of working igniters, burners of the gas turbine, and this number is compared with a specified minimum number of working devices,
moreover, if the minimum number of igniters, which is less than the number of igniters or burners, are recognized as healthy, then at the next time step, the supply of fuel to the number of burners of a gas turbine unlocked.

21. The device (12) measurements to determine the status of the electric igniter (14) of the burner of a gas turbine containing
the sensor (28) for initiated at the time of measuring the current of the electric igniter (14) of the burner of the gas turbine and associated with the sensor (28) device (29) evaluation with at least one memory and at least one means for comparison provided by the sensor (28) signal with at least one stored limit value, and the device (29) evaluation of the stored three different values, and there are three means for comparing the signal with a corresponding one of three values,
characterized in that
two of the three time-dependent limit values form the envelope curve (31, 41), and two of the three tools is designed as a comparator limit values, and
and one of the three values is performed as a time dependent response (51) trend given the current, and one of the three tools is designed as a comparator, which controls the signal for the presence of characteristics of oscillating relative to the characteristics of the trend of the specified current.

22. The device (12) measurement item 21, in which the envelope curve (31, 41) and/or characteristic (51) trend given the current saved(s) in the form of specifications or in tabular form.

23. The device (10) ignition for the burner of a gas turbine containing
the igniter (14), containing two located opposite one another electrode (16), and between their edges (20) of the electrodes can generate a spark (22) ignition by the ignition voltage, and
the transformer (24) ignition for the formation of the ignition voltage, and a transformer (24) ignition on the secondary side electrically connected to the electrodes (16),
characterized in that
the device (10) ignition device (12) measurements to determine the status of the electric igniter (14) of the burner of a gas turbine according to any one of p and 22.

24. The device (10) ignition on item 23, in which the sensor (28) of the device (12) measure placed on the primary side of the transformer (24) ignition.