CN108872853B - Fault diagnosis method for high vibration of large steam turbine generator rotor - Google Patents
Fault diagnosis method for high vibration of large steam turbine generator rotor Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G01R31/346—Testing of armature or field windings
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Abstract
The invention discloses a fault diagnosis method for high rotor vibration of a large turbonator, which comprises the following diagnosis stages of execution according to the sequence that the influence on the generator is gradually increased: the method comprises the following steps that firstly, items corresponding to a first type of fault reasons are checked during operation of the unit so as to locate specific fault reasons, and if the fault reasons are located and faults with high rotor vibration after corresponding processing are solved, other diagnosis stages are not executed; the second stage, when the unit runs, items corresponding to the second type of fault reasons are checked to locate specific fault reasons; and a third stage, when the unit is stopped, checking items corresponding to the third type of fault reasons to locate specific fault reasons, further confirming the fault reasons located in the previous diagnosis stage, and performing corresponding processing based on all finally located fault reasons. The invention can effectively avoid unnecessary shutdown maintenance and repeated startup and shutdown maintenance caused by incomplete maintenance.
Description
Technical Field
The invention relates to the field of nuclear power, in particular to a fault diagnosis method for high vibration of a large-scale steam turbine generator rotor.
Background
Along with the development of economy, the demand on electric power is more and more, and the total installed capacity of the generator is also more and more; with the continuous progress of the technology, the single-machine capacity of the generator is also larger and larger. The large-capacity generator has the advantages of high generating efficiency, energy conservation, environmental protection and the like; however, the application of the new technology also brings new challenges to the safe and economic operation of the power plant, once the large-scale generator is shut down due to a fault, huge economic losses are caused to power generation enterprises, and higher requirements are provided for load pre-control of the power grid.
The unplanned shutdown event caused by high rotor vibration of the large-scale steam turbine generator happens occasionally, and after the high rotor vibration fault occurs, the shutdown maintenance is started repeatedly due to unreasonable arrangement of the checking, analyzing, judging and processing flows, so that the power generation enterprise is subjected to serious economic loss, and even the regional power supply safety is influenced.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a fault diagnosis method for high vibration of a large-scale steam turbine generator rotor, aiming at the unreasonable defect of the prior art for high vibration fault treatment.
The technical scheme adopted by the invention for solving the technical problems is as follows: constructing a fault diagnosis method for high rotor vibration of a large-scale steam turbine generator, which comprises the following diagnosis stages executed according to the sequence with gradually increasing influence on the generator:
the first stage, the project corresponding to the first kind of fault reason is checked during the running of the unit so as to locate the specific fault reason, and if the fault reason is located and the fault with high rotor vibration after corresponding processing is solved, other diagnosis stages are not executed;
the second stage, when the unit runs, items corresponding to the second type of fault reasons are checked to locate specific fault reasons;
and a third stage, when the unit is stopped, checking items corresponding to the third type of fault reasons to locate specific fault reasons, further confirming the fault reasons located in the previous diagnosis stage, and performing corresponding processing based on all finally located fault reasons.
The first type of fault reason is a fault reason which can be positioned and processed under the normal operation condition of the unit; the second type of fault reason is a fault reason which can be positioned under various operation conditions of the unit and needs to be processed after shutdown; the third category of failure causes is failure causes that require shutdown to locate.
In the method for diagnosing a fault with high rotor vibration in a large-scale steam turbine generator according to the present invention, the second-class fault causes include a first-subclass fault cause, a second-subclass fault cause, and a third-subclass fault cause, and the second stage includes the following sub-stages:
a first sub-stage, which is used for checking items corresponding to the first subclass fault reasons when the unit operates normally so as to locate specific fault reasons;
a second sub-stage, detecting items corresponding to the second subclass fault reasons through power optimization during normal operation of the unit so as to locate specific fault reasons;
a third sub-stage, checking items corresponding to the third subclass fault reasons during idle running of the unit so as to locate specific fault reasons;
the first subclass fault reason is a fault reason which can be positioned under the normal operation condition of the unit and needs to be processed after shutdown; the second sub-fault reason is a fault reason that the motor needs to be correspondingly adjusted to be positioned under the normal operation condition of the unit and needs to be processed after the unit is shut down; the third subclass of fault causes can be located only when the unit operates in idle running and needs to be processed after shutdown.
In the method for diagnosing a fault of a large-scale steam turbine generator with high rotor vibration, the first stage specifically includes:
when the unit is in normal operation, the following three checks are performed:
checking whether the exciting current and the rotating speed of the generator rotor exceed a stable range, if so, judging that the vibration is high due to pole slipping, and eliminating a vibration high signal through the adjustment of the power of the generator;
checking whether the vibration monitoring loop and the monitoring device are in failure to cause false alarm of the vibration high signal, if so, carrying out corresponding processing on the vibration monitoring loop and the monitoring device to eliminate the vibration high signal;
checking whether the oil pressure of the sealing oil and the lubricating oil is normal, if so, judging that the vibration is high due to the abnormal oil pressure, and processing the oil pressure of the sealing oil and the lubricating oil to eliminate a vibration high signal;
if the fault reason is located through the checking item and the fault with high rotor vibration after processing is solved, other diagnosis stages are not executed, otherwise, the subsequent diagnosis stages are continuously executed.
In the fault diagnosis method for high rotor vibration of a large-scale steam turbine generator, the first stage and the first sub-stage are executed simultaneously.
In the method for diagnosing a fault of a large-scale steam turbine generator with high rotor vibration, the first sub-stage includes:
when the unit is in normal operation, the following four checks are performed:
checking the temperature of the bearing bush, and if the temperature of the bearing bush is high, judging that the vibration is high due to the fault of the bearing bush;
checking whether the rotor winding has grounding or short-circuit faults, if so, judging that the rotor winding is grounded or short-circuited to cause high vibration;
measuring the vibration of a foundation, a bedplate and a flange of a generator stator, checking whether resonance exists between the stator and the foundation, and if so, judging that the bearing support part has high vibration possibly caused by the fact that the rigidity of the bearing support part does not meet the requirement;
and checking whether the temperature deviation between the cold hydrogen coolers and the hot hydrogen is too large, if so, judging that the vibration caused by the thermal imbalance due to the too large temperature deviation of the cold hydrogen and the hot hydrogen is high.
In the method for diagnosing a fault of a large-scale steam turbine generator with high rotor vibration, the second sub-stage includes:
adjusting active power and reactive power of the generator, judging whether a thermal unbalance problem exists, and if the thermal unbalance problem exists, executing the following two items of check:
checking whether the temperature of the rotor winding is overhigh, if so, judging that the vibration caused by thermal unbalance due to overhigh temperature of the rotor winding is high;
and checking whether the zero sequence current is overlarge, if so, judging that the vibration caused by thermal imbalance is high due to overlarge zero sequence current.
In the method for diagnosing a fault of a large-scale steam turbine generator with high rotor vibration, the third sub-stage includes:
keeping the generator at a rated rotating speed, disconnecting a circuit breaker connected with a power grid, and disconnecting an excitation switch;
carrying out a high-frequency repeated shock wave method test or a rotor winding loss test, and if the test is unqualified, judging the vibration height caused by the turn-to-turn short circuit of the rotor winding;
and judging whether magnetic unbalance exists, if so, judging that the vibration caused by the magnetic unbalance is high.
In the method for diagnosing a fault of a large steam turbine generator rotor with high vibration according to the present invention, the third stage includes:
checking items of high vibration due to mechanical unbalance;
further confirming the fault cause located in the previous diagnosis stage;
and performing corresponding processing based on all the finally positioned fault reasons.
The implementation of the fault diagnosis method for the large-scale steam turbine generator rotor with high vibration has the following beneficial effects: according to the sequence that the influence on the generator is gradually increased, a plurality of diagnosis stages are executed, various possible fault reasons are found when the generator set runs, and the fault reasons positioned in all the diagnosis stages are uniformly processed after the generator set is stopped, so that unnecessary shutdown maintenance can be effectively avoided, repeated startup and shutdown maintenance events caused by incomplete maintenance can be avoided, and the economic loss of a power plant is reduced to the maximum extent.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts:
FIG. 1 is a flow chart of the preferred embodiment of the present invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Exemplary embodiments of the invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The general idea of the invention is as follows: according to the sequence that the influence on the generator is gradually increased, a plurality of diagnosis stages are executed, the plurality of diagnosis stages are divided into two types, one type is executed when the unit runs, and the other type is executed when the unit stops.
The method is characterized in that the vibration of the generator rotor develops from abnormal rise to equipment failure, a development process is provided, a period of time is generally used for judging the failure reason, the failure equipment is determined, the failure is eliminated, the equipment damage can be avoided, and the method is of great importance in reducing the economic loss. Because the generator rotor has a plurality of fault reasons (for example, external power grid reasons such as load fluctuation and power grid disturbance, generator auxiliary system reasons such as lubricating oil pressure deviation, temperature deviation of a hydrogen cooling system, unsmooth ventilation and the like, and system operation parameter setting errors such as slide poles caused by operation exceeding a limit condition, rotor faults such as winding turn-to-turn, grounding, shaft cracks or element damage and the like), the corresponding processing methods are different, and the fault types are accurately judged and corresponding maintenance processing is carried out. Some faults can be processed only under the normal operation condition, so that the economic loss is minimum; some of the faults need to be determined by adjusting the load, so that the economic loss is less; the other method needs to keep the rated rotating speed to judge the fault of the broken network, and has power failure loss, but has short power failure time and less economic loss; still others require long periods of down time to handle the power outage.
Therefore, the fault diagnosis method for high rotor vibration of the large-scale steam turbine generator comprises the following steps: in order of increasing impact on the generator, the following diagnostic phases are performed:
the first stage, the project corresponding to the first kind of fault reason is checked during the running of the unit so as to locate the specific fault reason, and if the fault reason is located and the fault with high rotor vibration after corresponding processing is solved, other diagnosis stages are not executed;
the second stage, when the unit runs, items corresponding to the second type of fault reasons are checked to locate specific fault reasons;
and a third stage, when the unit is stopped, checking items corresponding to the third type of fault reasons to locate specific fault reasons, further confirming the fault reasons located in the previous diagnosis stage, and performing corresponding processing based on all finally located fault reasons.
The first type of fault reason is a fault reason which can be positioned and processed under the normal operation condition of the unit; the second type of fault reason is a fault reason which can be positioned under various operation conditions of the unit and needs to be processed after shutdown; the third category of failure causes is failure causes that require shutdown to locate.
More specifically, the second-class fault reasons include a first-class fault reason, a second-class fault reason and a third-class fault reason, wherein the first-class fault reason is a fault reason which can be located under the normal operation condition of the unit and needs to be processed after shutdown; the second sub-fault reason can be positioned only by correspondingly adjusting the motor under the normal operation condition of the unit and needs to be processed after the unit is shut down; the third subclass of fault causes can be located only when the unit operates in idle running and needs to be processed after shutdown. Correspondingly, the second phase comprises the following sub-phases:
a first sub-stage, which is used for checking items corresponding to the first subclass fault reasons when the unit operates normally so as to locate specific fault reasons;
a second sub-stage, detecting items corresponding to the second subclass fault reasons through power optimization during normal operation of the unit so as to locate specific fault reasons;
a third sub-stage, checking items corresponding to the third subclass fault reasons during idle running of the unit so as to locate specific fault reasons;
the invention is described below in a preferred embodiment.
Referring to fig. 1, in the preferred embodiment, the fault diagnosis and processing for high vibration of the generator rotor are divided into five stages in the order of increasing impact on the generator, or in the order of low economic loss to high economic loss:
stage one: and checking the item corresponding to the first-class fault reason when the unit runs to locate the specific fault reason, wherein the first-class fault reason is a fault reason which can be located under the normal running condition of the unit and needs to be processed after the unit is stopped. If the cause of the fault is located and the fault with high rotor vibration is solved after corresponding treatment, no other diagnosis stage is executed.
The examination items and corresponding processing at this stage mainly include:
(1) checking whether the exciting current and the rotating speed of the generator rotor exceed a stable range, if so, judging that the vibration is high due to pole slipping, and eliminating a vibration high signal through the adjustment of the power of the generator;
(2) checking whether the vibration monitoring loop and the monitoring device are in failure to cause false alarm of the vibration high signal, if so, carrying out corresponding processing on the vibration monitoring loop and the monitoring device to eliminate the vibration high signal;
(3) checking whether the oil pressure of the sealing oil and the lubricating oil is normal, if so, judging that the vibration is high due to the abnormal oil pressure, and processing the oil pressure of the sealing oil and the lubricating oil to eliminate a vibration high signal;
the above checks are not affected each other, and can be performed synchronously to reduce the failure judgment time.
And a second stage: and checking the items corresponding to the second type of fault reasons when the unit normally operates to locate the specific fault reasons, wherein the second type of fault reasons are fault reasons which can be located under the normal operation condition of the unit and need to be processed after the unit is shut down. The second kind of fault causes are fault causes which can be positioned under the normal operation condition of the unit and need to be processed after shutdown
The examination items at this stage mainly include:
(1) and checking the temperature of the bearing bush, and if the temperature of the bearing bush is high, judging that the vibration is high due to the fault of the bearing bush.
(2) Checking whether the rotor winding has grounding or short-circuit faults, if so, judging that the rotor winding is grounded or short-circuited to cause high vibration; the grounding fault can be monitored by an online grounding detection device of the rotor winding, and the short circuit of the winding needs to be detected by an online monitoring device such as an air gap waveform test.
(3) And measuring the vibration of the foundation, the bedplate and the flange of the generator stator, checking whether resonance exists between the stator and the foundation, and if so, judging that the bearing support is high in vibration possibly caused by the fact that the rigidity of the bearing support does not meet the requirement.
(4) And checking whether the temperature deviation between the cold hydrogen coolers and the hot hydrogen is too large, if so, judging that the vibration caused by the thermal imbalance due to the too large temperature deviation of the cold hydrogen and the hot hydrogen is high.
In the stage, only the fault reason causing high vibration can be determined, the fault development trend can be predicted after the fault reason is determined, and a reasonable shutdown maintenance plan is made according to the prediction result.
Since the first and second phases are both checked during normal operation of the generator, they can be synchronized, and the further diagnostic phases are continued until the fault cause of the first phase is located and the corresponding fault with high rotor vibration is resolved.
And a third stage: checking items corresponding to the third type of fault reasons through power optimization during normal operation of the unit so as to locate specific fault reasons; the third type of fault reason is the fault reason that the motor needs to be correspondingly adjusted to be positioned under the normal operation condition of the unit and needs to be processed after the unit is stopped. Specifically, this stage includes:
adjusting active power and reactive power of the generator, judging whether a thermal unbalance problem exists, and if the thermal unbalance problem exists, executing the following two items of check: checking whether the temperature of the rotor winding is overhigh, if so, judging that the vibration caused by thermal unbalance due to overhigh temperature of the rotor winding is high; and checking whether the zero sequence current is overlarge, if so, judging that the vibration caused by thermal imbalance is high due to overlarge zero sequence current.
Because the thermal unbalance problem needs to be processed in a power generator shutdown state, only the fault reason can be determined in the stage; therefore, the fault development trend can be predicted according to the fault information and experience, and a shutdown plan can be made and processed.
And a fourth stage: and checking items corresponding to the fourth type of fault reasons during idle running of the unit to locate specific fault reasons, wherein the fourth type of fault reasons are fault reasons which can be located only during idle running of the unit and need to be processed after shutdown. Specifically, this stage includes:
keeping the generator at a rated rotating speed, disconnecting a circuit breaker connected with a power grid, and disconnecting an excitation switch; on one hand, a high-frequency repeated shock wave method ROS test or a rotor winding loss test is carried out, and if the test is unqualified, the vibration height caused by turn-to-turn short circuit of the rotor winding is judged; on the other hand, it is determined whether or not there is magnetic unbalance, and if so, it is determined that the vibration due to the magnetic unbalance is high, and at the time of the subsequent shutdown processing, the following items may be further checked: (1) checking whether stator and rotor installation deviation exists; (2) and checking whether a magnetic bias caused by local short circuit of the stator core exists.
Similarly, only the fault reason can be determined in the stage; the failure development trend can be predicted according to the failure information and experience, and a shutdown plan is formulated and processed.
And a fifth stage: and when the unit is stopped, items corresponding to the fifth type of fault reasons are checked to locate specific fault reasons, the fault reasons located in the previous diagnosis stage are further confirmed, and corresponding processing is carried out on all finally located fault reasons. The fifth category of faults is the cause of the fault that requires shutdown to locate. Specifically, this stage includes:
first, items of high vibration due to mechanical unbalance are checked: (1) checking whether the rotor counterweight mass is unbalanced; (2) checking whether the rotor structure component has damage problems (shaft cracks or component damage); (3) checking whether the bearing pad is stressed unevenly; (4) checking whether the coupler is loosened; (5) checking whether the shafting is not centered; (6) checking whether the oil gear of the rotor is rubbed or not; (7) checking whether the rotor sealing tile is rubbed or not; (8) checking whether the rotor and the foundation resonate or not; (9) checking whether the bearing support stiffness is problematic;
secondly, further confirming the fault causes positioned according to all the diagnosis stages 1-4, which mainly comprises the following steps: (1) the ventilation of the generator cooling system is asymmetric; (2) dislocation of hydrogen seal, etc.; (3) stator and rotor installation deviation; (4) the magnetic bias is caused by local short circuit of the stator core; (5) stator and rotor installation deviation; (6) the base support stiffness is reduced; (7) bearing deflection or pretension is incorrect, etc.
Thirdly, all fault causes based on final positioning are processed correspondingly.
It can be understood that the invention can be applied to the intelligent monitoring system of the generator, when one or more abnormal signals are monitored on line, the system can realize the automatic fault diagnosis function; the more the information quantity is collected, the more accurate the fault type judgment and positioning are.
In summary, the implementation of the fault diagnosis method for high rotor vibration of a large-scale steam turbine generator of the present invention has the following beneficial effects: according to the sequence that the influence on the generator is gradually increased, a plurality of diagnosis stages are executed, various possible fault reasons are found when the generator set runs, and the fault reasons positioned in all the diagnosis stages are uniformly processed after the generator set is stopped, so that unnecessary shutdown maintenance can be effectively avoided, repeated startup and shutdown maintenance events caused by incomplete maintenance can be avoided, and the economic loss of a power plant is reduced to the maximum extent.
The terms "simultaneously," "simultaneously," and the like, are not to be construed as limited to the absolute terms of equality or equality in mathematical terms, but may be engineered to be similar or within acceptable tolerances in the practice of the claims of this patent.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. A fault diagnosis method for high rotor vibration of a large-scale steam turbine generator is characterized by comprising the following diagnosis stages which are executed according to the sequence that the influence on the generator is gradually increased:
the method comprises the following steps that firstly, items corresponding to a first type of fault reason are checked during operation of the unit so as to locate a specific fault reason, if the fault reason is located and a fault with high rotor vibration is solved after corresponding processing, other diagnosis stages are not executed, and otherwise, other diagnosis stages are continuously executed;
the second stage, when the unit runs, items corresponding to the second type of fault reasons are checked to locate specific fault reasons;
a third stage, when the unit is stopped, items corresponding to the third type of fault reasons are checked to locate specific fault reasons, the fault reasons located in the previous diagnosis stage are further confirmed, and corresponding processing is carried out on the basis of all finally located fault reasons;
the first type of fault reason is a fault reason which can be positioned and processed under the normal operation condition of the unit; the second type of fault reason is a fault reason which can be positioned under various operation conditions of the unit and needs to be processed after shutdown; the third kind of fault causes are fault causes which can be positioned only by stopping the machine;
the second-class fault reason comprises a first-subclass fault reason, a second-subclass fault reason and a third-subclass fault reason, and the second stage comprises the following sub-stages:
a first sub-stage, which is used for checking items corresponding to the first subclass fault reasons when the unit operates normally so as to locate specific fault reasons;
a second sub-stage, detecting items corresponding to the second subclass fault reasons through power optimization during normal operation of the unit so as to locate specific fault reasons;
a third sub-stage, checking items corresponding to the third subclass fault reasons during idle running of the unit so as to locate specific fault reasons;
the first subclass fault reason is a fault reason which can be positioned under the normal operation condition of the unit and needs to be processed after shutdown; the second sub-fault reason is a fault reason that the motor needs to be correspondingly adjusted to be positioned under the normal operation condition of the unit and needs to be processed after the unit is shut down; the third subclass of fault causes can be located only when the unit operates in idle running and needs to be processed after shutdown.
2. The method for diagnosing the high-vibration fault of the rotor of the large-scale steam turbine generator according to claim 1, wherein the first stage specifically comprises:
when the unit is in normal operation, the following three checks are performed:
checking whether the exciting current and the rotating speed of the generator rotor exceed a stable range, if so, judging that the vibration is high due to pole slipping, and eliminating a vibration high signal through the adjustment of the power of the generator;
checking whether the vibration monitoring loop and the monitoring device are in failure to cause false alarm of the vibration high signal, if so, carrying out corresponding processing on the vibration monitoring loop and the monitoring device to eliminate the vibration high signal;
checking whether the oil pressure of the sealing oil and the lubricating oil is normal, if so, judging that the vibration is high due to the abnormal oil pressure, and processing the oil pressure of the sealing oil and the lubricating oil to eliminate a vibration high signal;
if the fault reason is located through the checking item and the fault with high rotor vibration after processing is solved, other diagnosis stages are not executed, otherwise, the subsequent diagnosis stages are continuously executed.
3. The method for diagnosing the high vibration of the rotor of the large-scale steam turbine generator according to claim 1, wherein the first sub-stage comprises:
when the unit is in normal operation, the following four checks are performed:
checking the temperature of the bearing bush, and if the temperature of the bearing bush is high, judging that the vibration is high due to the fault of the bearing bush;
checking whether the rotor winding has grounding or short-circuit faults, if so, judging that the rotor winding is grounded or short-circuited to cause high vibration;
measuring the vibration of a foundation, a bedplate and a flange of a generator stator, checking whether resonance exists between the stator and the foundation, and if so, judging that the bearing support part has high vibration possibly caused by the fact that the rigidity of the bearing support part does not meet the requirement;
and checking whether the temperature deviation between the cold hydrogen coolers and the hot hydrogen is too large, if so, judging that the vibration caused by the thermal imbalance due to the too large temperature deviation of the cold hydrogen and the hot hydrogen is high.
4. The method for diagnosing the high vibration fault of the rotor of the large-scale steam turbine generator according to claim 1, wherein the second sub-stage comprises:
adjusting active power and reactive power of the generator, judging whether a thermal unbalance problem exists, and if the thermal unbalance problem exists, executing the following two items of check:
checking whether the temperature of the rotor winding is overhigh, if so, judging that the vibration caused by thermal unbalance due to overhigh temperature of the rotor winding is high;
and checking whether the zero sequence current is overlarge, if so, judging that the vibration caused by thermal imbalance is high due to overlarge zero sequence current.
5. The method for diagnosing the high vibration of the rotor of the large-scale steam turbine generator according to claim 1, wherein the third sub-stage comprises:
keeping the generator at a rated rotating speed, disconnecting a circuit breaker connected with a power grid, and disconnecting an excitation switch;
carrying out a high-frequency repeated shock wave method test or a rotor winding loss test, and if the test is unqualified, judging the vibration height caused by the turn-to-turn short circuit of the rotor winding;
and judging whether magnetic unbalance exists, if so, judging that the vibration caused by the magnetic unbalance is high.
6. The method for diagnosing a large-scale steam turbine generator rotor vibration-high fault according to claim 1, wherein the third stage includes:
checking items of high vibration due to mechanical unbalance;
further confirming the fault cause located in the previous diagnosis stage;
and performing corresponding processing based on all the finally positioned fault reasons.
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| CN110702394B (en) * | 2019-10-18 | 2021-06-08 | 西安热工研究院有限公司 | Vibration change characteristic-based vibration fault diagnosis method for steam turbine generator unit |
| CN111609882A (en) * | 2020-05-15 | 2020-09-01 | 中国矿业大学 | Intelligent fault diagnosis system and method for large-sized combined dry separator |
| CN113238535B (en) * | 2021-06-03 | 2022-02-11 | 中国核动力研究设计院 | Fault diagnosis method and system for nuclear safety level DCS analog input module |
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