CN111832967A - System for evaluating service life of generator running for long time - Google Patents
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- 238000011156 evaluation Methods 0.000 claims abstract description 74
- 238000012360 testing method Methods 0.000 claims abstract description 47
- 238000002405 diagnostic procedure Methods 0.000 claims abstract description 46
- 238000009413 insulation Methods 0.000 claims abstract description 39
- 238000007689 inspection Methods 0.000 claims abstract description 33
- 238000011157 data evaluation Methods 0.000 claims abstract description 27
- 238000004804 winding Methods 0.000 claims abstract description 25
- 239000000306 component Substances 0.000 claims abstract description 9
- 239000008358 core component Substances 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 10
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 4
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- 230000009471 action Effects 0.000 abstract description 4
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Abstract
The invention discloses a system for evaluating the service life of a generator running for a long time, which comprises a data evaluation module, a generator inspection evaluation module and a field insulation diagnostic test evaluation; the data evaluation module comprises generator running condition evaluation, overhaul condition evaluation, historical test data evaluation and factory data evaluation; the generator inspection and evaluation module comprises professional inspection of accessible areas of the generator stator component, the rotor component and the core component; the field insulation diagnostic test evaluation module comprises a generator stator winding diagnostic test, a rotor winding diagnostic test and a stator core diagnostic test. The invention starts from generator aging elements, and according to the action mechanism and the appearance of each aging element, a component pertinence evaluation module finally forms a generator service life prolonging evaluation system by a data evaluation module, a generator inspection evaluation module and a field insulation diagnostic test evaluation module.
Description
Technical Field
The invention belongs to the field of generator evaluation, and particularly relates to a generator service life prolonging evaluation system.
Background
The insulation of the stator and the rotor in the operation of the generator is influenced by electricity, heat, mechanical stress and environmental factors, partial discharge can be generated when the electric stress (electric field intensity) is too high, charged particles generated by the partial discharge can damage chemical bonds of an insulating material, and a penetrating hole is formed after the partial discharge is continued for a long time to cause insulation failure. The design life of the generator for the thermal power plant is generally 30 years, when the operation age of the generator is close to or reaches the design life, a power plant manager will have the question whether the generator is suitable for continuous operation, and if the generator is suitable for continuous operation, the manager has important operation risks. A plurality of scientific research institutions in Japan, Europe, India, China and other countries carry out a great deal of research on the prediction of the residual life of the generator for a long time, and currently, the main generator prediction methods comprise: 1) predicting based on the generator operation history; 2) predicting based on non-destructive insulation test parameters; 3) a life assessment based on a non-electrical parameter. None of the above theories and methods for predicting the remaining life of a generator demonstrate the accuracy of these methods.
In 2015, the notification issued by the national energy agency about the development of the transformation, service life extension and retirement regulations of the subcritical coal electric unit (national energy power [ 2015 ] 332) proposes "a subcritical coal electric unit with an operation period of 30 years or 20 ten thousand hours is provided," after the service life extension transformation and safety evaluation, the service life of 30 ten thousand and 60 ten thousand kilowatt-level units can be generally prolonged by 10-15 years ".
In summary, for the generator with the operation life close to or reaching the design life, an effective life prolonging evaluation method and system for the generator with long operation life are lacked so as to scientifically solve the common problem of prolonging the service life of the generator.
Disclosure of Invention
The invention aims to provide a system for evaluating the service life of a running-year-old generator, which starts from generator aging elements, and forms the system for evaluating the service life of the running-year-old generator by a data evaluation module, a generator inspection evaluation module and a field insulation diagnostic test evaluation module according to the action mechanism and the appearance of each aging element and a component pertinence evaluation module.
The invention is realized by adopting the following technical scheme:
a generator service life prolonging evaluation system for a running year comprises a data evaluation module, a generator inspection evaluation module and a field insulation diagnostic test evaluation;
the data evaluation module comprises generator running condition evaluation, overhaul condition evaluation, historical test data evaluation and factory data evaluation;
the generator inspection and evaluation module comprises professional inspection of accessible areas of the generator stator component, the rotor component and the core component;
the field insulation diagnostic test evaluation module comprises a generator stator winding diagnostic test, a rotor winding diagnostic test and a stator core diagnostic test.
The invention is further improved in that the generator operation condition evaluation objects comprise a generator hydrogen system, a sealing oil system, a cooling water system and electrical parameters; the overhaul condition evaluation object comprises analysis before overhaul, a disintegration report and a summary after overhaul; the historical test data evaluation object comprises installation handover test data, accident first-aid repair test data and preventive test data; the factory data evaluation object comprises a quality guarantee certificate, a stator and rotor inspection and test report and a monitoring report.
The invention further improves that the generator stator winding diagnostic test comprises a stator winding insulation resistance test, a stator winding polarization index test, a leakage current and direct current withstand voltage test, a capacitance increment and dielectric loss factor increment test, an off-line partial discharge test, an end winding corona ultraviolet imaging detection test, a stator slot wedge knocking test, a stator winding end dynamic characteristic and vibration measurement.
In a further improvement of the invention, the rotor winding diagnostic test comprises a rotor insulation resistance, a rotor winding repetitive pulse method and a rotor detection coil waveform method.
A further improvement of the invention is that the stator core diagnostic test comprises an electromagnet core fault detection test.
The invention is further improved in that the field insulation diagnostic tests are nondestructive tests, and the normal development of the tests can not cause structural or functional damage to the generator.
The invention is further improved in that the system operation is performed in the order of the data-based evaluation, the generator inspection evaluation, and the field insulation diagnostic test evaluation, the data-based evaluation preliminary result being used as a basis for the generator inspection evaluation, and the data-based evaluation and the generator inspection preliminary result being used as a basis for the field insulation diagnostic test evaluation.
The invention is further improved in that the generator refers to a steam turbine generator and a gas turbine generator.
The invention has the following beneficial technical effects:
1. the service life prolonging evaluation system for the generator running for a long time is provided for the first time, the evaluation system has wide coverage, comprises three aspects of data evaluation, generator inspection evaluation and field insulation diagnostic test evaluation, and can completely reflect the state of the generator to be evaluated;
2. evaluating a generator which runs close to or reaches the designed service life, finding hidden dangers influencing the continuous service safety operation of the unit in advance, and providing maintenance or modification suggestions;
3. the field insulation diagnostic tests are nondestructive tests, the generator can not be structurally or functionally damaged by normal development of the tests, and accumulated damage to equipment caused by pressure-resistant tests in part of traditional preventive tests is avoided.
4. The adopted diagnostic tests are the mainstream advanced test methods which are passed internationally, and the system is suitable for steam turbine generators and gas turbine generators which are produced at home and abroad.
Drawings
FIG. 1 is a block diagram of a system for evaluating the life of a generator during operation according to the present invention;
fig. 2 is a schematic diagram of a technical route for evaluating various aging factors of a generator according to the present invention.
In the figure: 1 is generator aging factor, 2 is electrical stress, 3 is thermal stress, 4 is mechanical stress, 5 is environmental stress, 6 is data evaluation, 7 is generator inspection evaluation, and 8 is field insulation diagnostic test evaluation.
Detailed Description
In order to make the usage, technical route and features of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments and the accompanying drawings.
As shown in FIG. 1, the system for evaluating the service life of a generator running for a long time provided by the invention comprises a data evaluation module, a generator inspection evaluation module and a field insulation diagnostic test evaluation module. The implementation of the system is based on the current national, industrial and manufacturing standard, and the evaluation work of the generator is carried out by means of the current instruments and equipment.
The data evaluation module comprises four parts of operation condition, overhaul condition, historical test data and factory data. The operation condition is evaluated according to the current industry standard DL/T1164 and 2012 'guide rule for operating the turbonator'; the maintenance condition is according to the current industry standard DL/T1766.1-2017 part 1 of the maintenance guide of the water-hydrogen-cooled turbine generator: the general rule and DL/T838 and 2017 evaluation of the coal-fired thermal power generation enterprise equipment overhaul guide rules are evaluated; the historical test data is evaluated according to the current industry standard DL/T596 and 1996 electric power equipment preventive test regulations and DL/T1768 and 2017 rotating motor preventive test regulations; the factory data is evaluated according to the current national standard GB 50150-2016 Electrical device installation engineering electrical equipment handover test standard.
The generator inspection and evaluation module comprises three parts, namely stator part inspection, iron core part inspection and rotor part inspection. The development of the parts can be realized by means of the existing special equipment, such as an industrial endoscope, a portable hardness tester, a feeler gauge and the like. The evaluation conclusion can be obtained according to the standard of the generator manufacturers in China.
The field insulation diagnostic test evaluation module comprises a stator winding diagnostic test, a stator core diagnostic test and a rotor winding diagnostic test. The stator winding diagnostic test is carried out according to the current industry standard DL/T492-2009 guide rule for identifying insulation aging of the epoxy mica stator winding of the generator, and comprises tests such as dielectric loss increment, capacitance increment, off-line partial discharge and the like; the stator core diagnostic test is carried out by using a rated flux method or an iron core electromagnetic fault diagnosis method according to GB/T20835 and 2016 (guide rules for magnetization test of stator core of generator); the rotor winding diagnostic test is carried out according to DL/T1525-2016 'guidance for turn-to-turn short circuit fault diagnosis of a rotor of a non-salient pole synchronous generator', and comprises tests of alternating current impedance, RSO, a detection coil wave method and the like.
As shown in fig. 2, the specific implementation technical route of the present invention is that, starting from the aging elements of the generator that affect the continued service of the generator, a targeted evaluation means is specified according to the action mechanism and the appearance of each aging element, and finally, each evaluation module together constitutes an operating-life-prolonging evaluation system for the generator. The generator aging elements 1 are electrical stress 2, thermal stress 3, mechanical stress 4 and environmental stress 5.
The typical effect of electrical stress on generator aging is that partial discharge occurs in insulating internal holes or surfaces, surface discharge can be observed by corona test and visual inspection, and internal discharge can be reflected by some electrical tests before forming through holes, such as insulation resistance, dielectric loss, partial discharge and the like. The long-term development of partial discharge can finally cause insulation breakdown, and the influence of electric stress on the aging of the generator is judged by checking the operation data of the generator, such as whether the problems of stator grounding, interphase short circuit, rotor grounding and the like occur in the operation. From the above, it can be found that the aging degree of the generator by the electrical stress can be completely judged by the data evaluation 6, the generator inspection evaluation 7 and the field insulation diagnostic test evaluation 8.
Thermal stress is mainly manifested in two ways. (1) The destructive effect of high temperature on the molecular structure of the insulating material; (2) due to the different expansion coefficients of the insulation and the conductor, the tight bond between the insulation and the conductor is torn after a plurality of thermal cycles, which further causes the generation of partial discharge. And the historical starting and stopping times of the generator are consulted, and the historical starting and stopping times of the generator are direct indexes of the thermal cycle times of the generator. By means of the cooling circuit and the insulation component check, it is possible to indirectly analyze whether the cooling effect is sufficient and whether an overheating phenomenon is present. As for the problem of adhesion of the insulation to the conductor, it can be reflected by the partial discharge test. From the above, it can be found that the degree of the aging effect of the thermal stress on the generator can be completely judged by the data evaluation 6, the generator inspection evaluation 7, and the field insulation diagnostic test evaluation 8.
There are three sources of mechanical stress. (1) The electromagnetic force generated by the interaction of the magnetic fields of the upper and lower wire rods in the same slot has the circumferential electromagnetic force at the end due to the winding arrangement characteristic; (2) mechanical impact generated in the transient process, such as short circuit in a near zone, asynchronous grid connection and the like; (3) the rotor runs at high speed and the insulation structure is subjected to a large centrifugal force. The former two kinds can cause the fixed structure to vibrate, lead to short circuit fault when insulating wearing and tearing are serious, carry out slot wedge and tip fixed knot to construct the detection and the part joint inspection, judge the severity of vibration. Rotor state can be judged by rotor turn-to-turn short circuit detection and visual inspection. By looking up historical operating data, whether the generator has been subjected to outlet three-phase short circuit or not and non-synchronous grid connection can be determined, and the severity of mechanical stress can be determined. From the above, it can be found that the degree of the aging effect of the mechanical stress on the generator can be completely judged by the data evaluation 6, the generator inspection evaluation 7, and the field insulation diagnostic test evaluation 8.
Environmental stresses such as leakage of sealing oil, particulate foreign matter, creepage or cracking of the insulating surface caused by hydrogen humidity failure, etc. By looking up the alarm records of the generator leakage detection device in the historical operating data, whether the sealing oil leakage condition exists can be determined. In addition, the surface creepage caused by leakage of sealing oil, particle foreign matters and unqualified hydrogen humidity can be judged through the inspection and evaluation of the generator. Part of the particle foreign matters are difficult to observe and can be found and accurately positioned through a corona test. From the above, it can be found that the aging degree of the generator caused by the environmental stress can be completely judged by the data evaluation 6, the generator inspection evaluation 7 and the field insulation diagnostic test evaluation 8.
In summary, the service life prolonging evaluation system of the generator running for a long time provided by the invention can realize service life prolonging evaluation of the generator running close to or reaching the design service life through three modules, namely the data evaluation 6, the generator inspection evaluation 7 and the field insulation diagnostic test evaluation 8, and can carry out overall evaluation on the equipment state and possible fault risks of the generator after comprehensive action of various aging factors.
Claims (8)
1. A generator service life prolonging evaluation system for a running year is characterized by comprising a data evaluation module, a generator inspection evaluation module and a field insulation diagnostic test evaluation;
the data evaluation module comprises generator running condition evaluation, overhaul condition evaluation, historical test data evaluation and factory data evaluation;
the generator inspection and evaluation module comprises professional inspection of accessible areas of the generator stator component, the rotor component and the core component;
the field insulation diagnostic test evaluation module comprises a generator stator winding diagnostic test, a rotor winding diagnostic test and a stator core diagnostic test.
2. The system for evaluating the service life of a generator according to claim 1, wherein the generator service condition evaluation objects comprise a generator hydrogen system, a sealing oil system, a cooling water system, and electrical parameters; the overhaul condition evaluation object comprises analysis before overhaul, a disintegration report and a summary after overhaul; the historical test data evaluation object comprises installation handover test data, accident first-aid repair test data and preventive test data; the factory data evaluation object comprises a quality guarantee certificate, a stator and rotor inspection and test report and a monitoring report.
3. The system of claim 1, wherein the generator stator winding diagnostic tests include stator winding insulation resistance, stator winding polarization index, leakage current and dc withstand voltage tests, capacitance increase and dielectric loss factor increase tests, offline partial discharge tests, endwinding corona uv imaging detection, stator slot wedge rapping tests, stator winding endwinding dynamic characteristics, and vibration measurements.
4. The operational lifetime generator longevity evaluation system of claim 1, wherein said rotor winding diagnostic tests include rotor insulation resistance, rotor winding repetitive pulse method, rotor search coil waveform method.
5. The operational lifetime generator longevity evaluation system of claim 1, wherein said stator core diagnostic test comprises an electromagnet core fault detection test.
6. The operational life span assessment system of claim 1, wherein said field insulation diagnostic tests are non-destructive tests, and normal development of the tests does not cause structural or functional damage to the generator.
7. The operational lifetime generator service life assessment system according to claim 1, wherein the system operation is performed in the order of data-based assessment, generator inspection assessment, field insulation diagnostic test assessment, the data-based assessment preliminary results being used as a basis for the generator inspection assessment, and the data-based assessment and the generator inspection preliminary results being used as a basis for the field insulation diagnostic test assessment.
8. The system for evaluating the longevity of a run-time generator according to claim 1, wherein the generator is a turbine generator or a gas turbine generator.
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| CN113222334A (en) * | 2021-04-01 | 2021-08-06 | 长江勘测规划设计研究有限责任公司 | Hydropower station unit life-prolonging operation safety assessment platform and use method thereof |
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| CN114002532B (en) * | 2021-11-01 | 2022-11-29 | 南方电网调峰调频发电有限公司检修试验分公司 | Method for judging insulation thermomechanical degradation of VPI (vacuum vapor pressure insulated) bar of pumped storage generator motor |
| US11892496B1 (en) | 2021-11-01 | 2024-02-06 | Csg Power Generation Co., Ltd. Maintenance And Test Company | Method for determining insulation thermomechanical deterioration of VPI wire rod of pumped storage power generation motor |
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Application publication date: 20201027 |