CN112269081A - Multi-factor aging stress control platform and method for stator bar of large hydraulic generator - Google Patents
Multi-factor aging stress control platform and method for stator bar of large hydraulic generator 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
- G01R31/003—Environmental or reliability tests
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
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- G01M7/022—Vibration control arrangements, e.g. for generating random vibrations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/025—Measuring arrangements
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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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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Abstract
The invention discloses a platform and a method for controlling multifactor aging stress of a stator bar of a large-scale hydraulic generator, which can be used for truly reproducing the real machine aging process of the stator bar in a laboratory. The platform can realize multi-factor aging stress control of applying three aging factors of electricity, heat and machinery to the whole stator bar of the large-scale hydraulic generator at the same time. The heat aging factor is heated by the heating plate to the stator bar and is closed-loop controlled by the temperature control box. The electrical aging factor is provided by a transformer, and closed-loop control can be performed on the electrical aging factor through the transformer. The mechanical aging factor is provided by the vibration exciter and can be controlled in a closed loop mode by the intelligent signal generator. The three aging factors of electricity, heat and machinery can be subjected to closed-loop control by the platform, the platform can meet the aging test requirements of different stator bar of a large hydraulic generator real machine, and a foundation is laid for researching the insulation aging rule and service life prediction of the stator bar.
Description
Technical Field
The invention belongs to the technical field of large hydraulic generators, and particularly relates to a platform and a method for controlling multifactor aging stress of a stator bar of a large hydraulic generator.
Background
The operational reliability of the hydraulic generator plays an extremely important role in the normal operation of a power system, particularly the safe production of national economy. The stator bar is used as a main component of a stator winding system of the hydraulic generator, and the performance of the stator bar is directly related to the operational reliability, the service life and the technical and economic indexes of a unit. In the operation process of the motor, the stator winding is gradually damaged under the synergistic action of multi-factor stress such as electricity, heat, machinery and the like, and the insulation and mechanical properties are gradually degraded. When the insulation level is severely degraded, generator failure can result. Once the fault can cause regional power grid fluctuation and even threaten the safety and the power supply reliability of the whole power system, serious economic loss is brought to a power generation enterprise. Therefore, in order to study the rule of insulation aging of the stator bar and predict the residual life of the stator bar, the stator bar must be artificially subjected to an accelerated aging test.
In the on-line operation process of the large-scale hydraulic generator, the stator bar is subjected to three stress effects of electricity, heat and machinery. Therefore, these three aging factors are artificially enhanced in the laboratory to accelerate the insulation aging of the stator bars. However, the requirement for equipment is high by applying three aging factors simultaneously, and certain difficulty exists in the requirement that the three aging factors do not influence each other. At present, single-factor accelerated aging or double-factor sequential aging is generally adopted, but the two aging modes cannot truly reflect the insulation aging process of the stator bar under the actual working condition. And the existing method can only age a local stator bar sample, but not an entire stator bar. In practical situations, the whole stator bar has more research significance than a local stator bar sample.
Disclosure of Invention
The invention aims to provide a platform and a method for controlling the multifactor aging stress of a stator bar of a large hydraulic generator, which are used for solving the problems in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a multifactor aging stress control platform for a stator bar of a large-scale hydraulic generator comprises a vibration exciter cement base, an intelligent signal generator, a power amplifier, an electrodynamic vibration exciter, a piezoelectric force sensor, a charge amplifier, a heating plate, a stator bar multifactor aging stress control platform body, a whole stator bar, a high-voltage cable, a thermocouple, a temperature control box, a vibration exciter cooling system, a butt welding block, a stator bar fixing support, a supporting insulator, a transformer and a vibration exciter ventilating groove;
the platform body is integrally arranged in a platform box, the platform box is of a closed heat insulation structure, a plurality of stator bar fixing supports are uniformly arranged on the upper surface of the stator bar multifactor aging stress control platform body, a plurality of whole stator bars are fixed on the stator bar fixing supports in parallel, heating plates are uniformly distributed on the front and back surfaces of the stator bars, a heating plate power supply is controlled by a temperature control box, thermocouples are uniformly distributed on the heating plates, temperature data measured by the thermocouples are fed back to the temperature control box in real time, two ends of the whole stator bars are respectively connected through a head-in-parallel welding block, and the head-in-parallel welding block at one end is connected to a transformer through a high-voltage cable;
platform case both sides bottom symmetry is provided with the vibration exciter ventilation groove, and the vibration exciter ventilation groove of both sides is located both ends respectively and welds under the piece, is provided with the electrodynamic type vibration exciter in the vibration exciter ventilation groove, and the electrodynamic type vibration exciter is connected to directly over and welds the piece through insulating ejector pin, is provided with piezoelectric type force sensor on the insulating ejector pin, and piezoelectric type force sensor loops through charge amplifier, intelligent signal generator and power amplifier and is connected to the electrodynamic type vibration exciter.
Furthermore, a vibration exciter base is arranged in the vibration exciter ventilating groove, and the upper part of the vibration exciter base is connected to the electric vibration exciter through a supporting insulator.
Further, a vibration exciter cooling system for ventilating the vibration exciter ventilating groove to cool the electric vibration exciter is connected to the platform box.
Further, the intelligent signal generator is a signal generator of an integrated closed-loop control module based on STM32 chip design.
A multi-factor aging stress control method for a stator bar of a large hydraulic generator comprises thermal stress control, electrical stress control and mechanical stress control;
the thermal stress control is specifically as follows: heating the whole stator bar by a heating plate, wherein the power supply of the heating plate is provided by a temperature control box; the closed heat insulation structure of the platform box enables the temperature of the heating plate to rise rapidly and be maintained in a set range, and the process of thermal aging of the stator bar in an actual unit is simulated really;
the heating plate is uniformly distributed with thermocouples, the temperature of the heating plate is monitored in real time through the thermocouples and fed back to the temperature control box in real time, when the monitored temperature reaches the set temperature in the temperature control box, the temperature control box disconnects the power supply of the heating plate and stops heating the whole stator bar, and when the monitored temperature is lower than the set temperature, the temperature control box closes the power supply of the heating plate and continues heating the whole stator bar;
the electrical stress control comprises: the transformer connected with the high-voltage cable provides high-voltage alternating current for electrical aging of the whole stator bar, and the insulating ejector rod is insulated, and the electrodynamic vibration exciter is insulated from the ground through the supporting insulator, so that electrical and mechanical thermal aging factors can be simultaneously applied to the whole stator bar;
the mechanical stress control is specifically as follows: providing mechanical stress for mechanical aging of the whole stator bar by an electrodynamic vibration exciter, outputting a sinusoidal signal by an intelligent signal generator, amplifying the sinusoidal signal by a power amplifier, accessing the electrodynamic vibration exciter to generate exciting force, changing the size and frequency of the output signal by the intelligent signal generator, adjusting the gain of the power amplifier, and changing the size and frequency of the exciting force output by the electrodynamic vibration exciter;
the acceleration of the insulating ejector rod is measured through a piezoelectric force sensor and a charge amplifier and fed back to an intelligent signal generator in real time, so that the closed-loop control of mechanical stress is realized; the intelligent signal generator adjusts the size and the frequency of an output sinusoidal signal in real time according to the actual acceleration, so that the vibration amplitude and the frequency of the whole stator bar are always kept in a given range.
Furthermore, the transformer is provided with an automatic protection device and a monitoring device, so that the output voltage can be monitored in real time, when a fault occurs, the power supply can be immediately cut off, and when the voltage deviates from a set value, the set value can be automatically adjusted back.
Furthermore, the platform box is connected with a vibration exciter cooling system used for ventilating the vibration exciter ventilating groove to cool the electric vibration exciter, and the electric vibration exciter is ventilated and cooled in real time through the vibration exciter ventilating groove when in work.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention provides a multi-factor aging stress control platform for simultaneously aging electrical, thermal and mechanical aging factors of a whole stator bar of a large hydraulic generator. Compared with the prior art, the platform can carry out closed-loop control on three aging factors of electricity, heat and machinery, wherein the electricity aging factor carries out closed-loop control through a transformer, the thermal stress carries out closed-loop control through a temperature control box, and the machinery aging factor carries out closed-loop control through an intelligent signal generator. The platform design size is big, and it is whole stator bar to be directed against large-scale hydraulic generator real machine, and it has more important value to research large-scale hydraulic generator stator bar ageing law and life prediction to compare current local stator bar sample. When the multi-factor aging stress control of the stator bar is carried out, the invention simultaneously applies electric, thermal and mechanical stress to the whole stator bar, thereby truly reproducing the multi-factor aging process of the stator bar.
Drawings
FIG. 1 is a front view of a multi-factor aging stress control platform for a large hydro-generator stator bar;
FIG. 2 is a top plan view of a multi-factor aging stress control platform for a large hydro-generator stator bar;
wherein, 1, a vibration exciter base; 2. an intelligent signal generator; 3. a power amplifier; 4. an electrodynamic vibration exciter; 5. a piezoelectric force sensor; 6. a charge amplifier; 7. heating plates; 8. the stator bar multifactor aging stress control platform body; 9. a whole stator bar; 10. a high voltage cable; 11. a thermocouple; 12. a temperature control box; 13. a vibration exciter cooling system; 14. a bonding block; 15. a stator bar fixing bracket; 16. a support insulator; 17. a transformer; 18. a platform box; 19. the vibration exciter ventilation groove.
In order to clearly visualize the entire stator bar multi-factor aging stress control platform 8, the platform box 18 is represented here as a transparent box.
Fig. 3 is a flow chart of the closed loop control of the intelligent signal generator.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present invention more clear, the following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The platform can control various aging stresses, lay a foundation for the subsequent special research of the detection and evaluation research of the insulation state of the stator bar of the large hydraulic generator, and has important research value for ensuring the high-efficiency and reliable operation of the generator.
Referring to fig. 1-2, the platform for multifactor aging stress control of stator bars of large hydro-generators of the present invention comprises: the device comprises a vibration exciter base 1, an intelligent signal generator 2, a power amplifier 3, an electrodynamic vibration exciter 4, a piezoelectric force sensor 5, a charge amplifier 6, a heating plate 7, a stator bar multifactor aging stress control platform body 8, a whole stator bar 9, a high-voltage cable 10, a thermocouple 11, a temperature control box 12, a vibration exciter cooling system 13, a parallel welding block 14, a stator bar fixing support 15, a supporting insulator 16, a transformer 17, a platform box 18 and a vibration exciter ventilating groove 19.
The stator bar multifactor aging stress control platform body 8 is integrally arranged in a platform box 18, and the platform box 18 is of a closed heat insulation structure. The platform box 18 enclosing the insulation structure enables the operating environment of the stator bar to be simulated in the box in actual operation. The left and right bottoms of the platform box 18 are provided with exciter ventilating grooves 19 of the electric exciters 4, wherein the electric exciters 4 and the related equipment are positioned. Stator bar fixed bolster 15 is on 8 upper surfaces of stator bar multifactor aging stress control platform body platform, and stator bar fixed bolster 15 evenly distributed to can fix whole root stator bar 9, this stator bar multifactor aging stress control platform body 8 can satisfy many stator bars simultaneously and carry out multifactor ageing. Heating plates 7 are uniformly distributed on the front surface and the rear surface of the whole stator bar 9, and the power supply of the heating plates 7 is controlled by a temperature control box 12. Thermocouples 11 are uniformly distributed on the heating plate 7, and temperature data measured by the thermocouples 11 are fed back to the temperature control box 12 in real time. The stator bar multifactor aging stress control platform body 8 is connected with a transformer 17 through a high-voltage cable 10 to apply the electric stress of the whole stator bar 9.
The vibration exciter base 1 is fixed with the ground, and a supporting insulator 16 is fixed on the vibration exciter base. The electric vibration exciter 4 is fixed on the supporting insulator 16, the supporting insulator 16 and the electric vibration exciter 4 are rigidly connected, and the electric vibration exciter 4 is insulated from the ground. The electrodynamic vibration exciter 4 is rigidly connected with the whole stator bar 9 at the parallel welding block 14 through an insulating ejector rod. The vibration exciter base 1, the supporting insulator 16, the electric vibration exciter 4 and the piezoelectric force sensor 5 are all located in the vibration exciter ventilating groove 19. The exciter cooling system 13 ventilates the ventilation groove 19 to cool the electric exciter 4. The electric vibration exciter 4 is powered by the intelligent signal generator 2 and the power amplifier 3, and real-time exciting force acceleration information is fed back to the intelligent signal generator 2 by the piezoelectric force sensor 5 and the charge amplifier 6, so that closed-loop control of the electric vibration exciter 4 is formed. The intelligent signal generator 2 is a signal generator of an integrated closed-loop control module based on an STM32 chip design.
The multi-factor aging stress control platform for the stator bar is designed aiming at multi-factor aging of the whole stator bar of a large hydraulic generator real machine. Wherein the thermal stress forms a closed loop control through the uniformly distributed heating plate 7, the thermocouple 11 and the temperature control box 12. The closed-loop control of the electrical stress is performed by means of the high-voltage cable 10 and the transformer 17. The mechanical stress forms closed-loop control through the intelligent signal generator 2, the power amplifier 3, the electrodynamic vibration exciter 4, the piezoelectric force sensor 5 and the charge amplifier 6. Three aging factors of the platform are controllable, and a multi-factor aging process of the stator bar with three stresses applied simultaneously can be realized.
Wherein the thermal stress is embodied in the following manner:
heating plates 7 are uniformly distributed on the front surface and the rear surface of the whole stator bar 9, and a temperature control box 12 supplies power to the heating plates 7. The heating plate 7 heats the entire stator bar by means of internal heating tubes. Thermocouples 11 are uniformly distributed on the heating plate 7, and the thermocouples 11 can monitor the temperature of the heating plate 7 in real time and feed the monitored temperature back to the temperature control box 12 in real time. Since the platform box is a closed heat insulation structure, the temperature of the heating plate 7 can be quickly raised to a set temperature and maintained. When the monitored temperature is greater than the set temperature, the temperature control box 12 disconnects the power to the heater plate 7 and stops heating the entire stator bar. When the monitored temperature is less than the set temperature, the temperature control box 12 closes the power supply to the heater plate 7 and continues to heat the entire stator bar. The heating plate 7, the thermocouple 11 and the temperature control box 12 form a closed loop system for controlling the thermal stress of the stator bar, and the temperature of the heating plate 7 can be effectively controlled in real time.
The electrical stress is embodied in the following way:
the high voltage cable 10 is connected at one end to a transformer 17 and at the other end to the stator bar end and butt weld 14. During electrical stress aging, the output voltage of the transformer 17 is adjusted to a set voltage value. The transformer 17 is provided with an automatic protection device and a monitoring device, so that the output voltage can be monitored in real time, when a fault occurs, the power supply can be immediately cut off, and when the actual voltage deviates from the set voltage value, the set value is automatically adjusted. Thus, an effective closed-loop control of the stator bar electrical stress can be achieved by the transformer 17.
The mechanical stress is embodied in the following way:
the intelligent signal generator 2 outputs a sine signal with certain voltage and frequency, the sine signal is amplified by the power amplifier 3, and then the sine signal is connected to the electrodynamic vibration exciter 4 to generate exciting force. Meanwhile, the piezoelectric force sensor 5 and the charge amplifier 6 measure the acceleration of the insulating ejector rod of the vibration exciter in real time and feed the acceleration back to the intelligent signal generator 2, so that closed-loop control of mechanical stress is formed. While the electrodynamic exciter 4 is operating, the exciter cooling system 13 also ventilates and cools the electrodynamic exciter 4 in real time via the exciter ventilation slot 19. The intelligent signal generator 2 is a signal generator of an integrated closed-loop control module based on STM32 chip design. Referring to fig. 3, a specific process for implementing the mechanical stress closed-loop control of the intelligent signal generator 2 is described as follows.
The signal is output through the DAC module of the smart signal generator 2, which is capable of outputting a high-quality sinusoidal signal. The output signal passes through a blocking, buffering and amplifying circuit and then is connected into an electrodynamic vibration exciter 4 to finish the application of mechanical stress; the acceleration of the vibration exciter ejector rod is measured in real time through the piezoelectric force sensor 5 and the charge amplifier 6 to form analog electric signal feedback, and the feedback signal is accessed to an ADC sampling port of the intelligent signal generator 2 through a voltage conditioning circuit; the ADC sampling device of the intelligent signal generator 2 samples the analog feedback signal, converts the feedback signal into a digital signal, and simultaneously performs Moving Average (MA) filtering on the sampled digital signal by using a DMA (direct memory access) technology; the filtered feedback signal is subjected to FFT (fast fourier transform) to obtain the frequency, amplitude, and phase information of the feedback signal with high accuracy.
And judging whether the electrodynamic vibration exciter 4 normally operates or not through the feedback signal, if the feedback signal deviates from the requirement, adjusting the output signal of the intelligent signal generator 2, and changing the frequency and amplitude of the output signal of the intelligent signal generator 2 through respectively adjusting a timer clock and data for regenerating a waveform so as to keep the vibration of the stator bar close to a given range all the time.
When the multifactor aging of the stator bar is carried out, the electrical, thermal and mechanical stress is applied to the stator bar at the same time, so that the electrical, thermal and mechanical multifactor aging process of the stator bar can be realized.
The invention provides a multi-factor aging stress control platform for simultaneously aging electrical, thermal and mechanical aging factors of a real machine whole stator bar of a large hydraulic generator. The platform can carry out closed-loop control on three aging factors of electricity, heat and machinery, and aims at the whole stator bar of the large-scale hydraulic generator. The platform accelerates the aging of the stator bar, does not influence the normal aging mechanism of the stator bar, does not damage the internal mechanical mechanism of the stator bar, and truly and effectively reproduces the aging process of the stator bar in an actual unit.
The platform can realize multi-factor aging stress control of applying three aging factors of electricity, heat and machinery to the whole stator bar of the large-scale hydraulic generator at the same time. The heat aging factor is heated by the heating plate to the stator bar and is closed-loop controlled by the temperature control box. The electrical aging factor is provided by a transformer, and closed-loop control can be performed on the electrical aging factor through the transformer. The mechanical aging factor is provided by the vibration exciter and can be controlled in a closed loop mode by the intelligent signal generator. The three aging factors of electricity, heat and machinery can be subjected to closed-loop control by the platform, the platform can meet the aging test requirements of different stator bar of a large hydraulic generator real machine, and a foundation is laid for researching the insulation aging rule and service life prediction of the stator bar.
Claims (7)
1. A multifactor aging stress control platform for a stator bar of a large-scale hydraulic generator is characterized by comprising a vibration exciter cement base (1), an intelligent signal generator (2), a power amplifier (3), an electrodynamic vibration exciter (4), a piezoelectric force sensor (5), a charge amplifier (6), a heating plate (7), a stator bar multifactor aging stress control platform body (8), a whole stator bar (9), a high-voltage cable (10), a thermocouple (11), a temperature control box (12), a vibration exciter cooling system (13), a parallel welding block (14), a stator bar fixing support (15), a supporting insulator (16), a transformer (17) and a vibration exciter ventilation groove (19);
the stator bar multifactor aging stress control platform body (8) is integrally positioned in a platform box (18), the platform box (18) is of a closed heat insulation structure, a plurality of stator bar fixing supports (15) are uniformly arranged on the upper surface of the stator bar multifactor aging stress control platform body (8), a plurality of whole stator bars (9) are fixed on the stator bar fixing supports (15) side by side, heating plates (7) are uniformly distributed on the front and back surfaces of the stator bars (9), the power supply of the heating plates (7) is controlled by a temperature control box (12), thermocouples (11) are uniformly distributed on the heating plate (7), temperature data measured by the thermocouples (11) are fed back to the temperature control box (12) in real time, two ends of a plurality of whole stator bar (9) are respectively connected through a parallel welding block (14), wherein the bonding block (14) at one end is connected to a transformer (17) through a high-voltage cable (10);
platform case (18) both sides bottom symmetry is provided with vibration exciter ventilation groove (19), vibration exciter ventilation groove (19) of both sides are located both ends respectively and weld under (14), be provided with electrodynamic vibration exciter (4) in vibration exciter ventilation groove (19), electrodynamic vibration exciter (4) are connected to directly over and weld under (14) through insulating ejector pin, be provided with piezoelectric type force transducer (5) on the insulating ejector pin, piezoelectric type force transducer (5) loop through charge amplifier (6), intelligent signal generator (2) and power amplifier (3) are connected to electrodynamic vibration exciter (4).
2. The platform for controlling the multifactor aging stress of the stator bar of the large-scale hydraulic generator according to claim 1, is characterized in that an exciter base (1) is arranged in the exciter ventilating groove (19), and the upper part of the exciter base (1) is connected to the electric exciter (4) through a supporting insulator (16).
3. The multifactor aging stress control platform for a large hydro generator stator bar according to claim 1, characterized in that an exciter cooling system (13) for ventilating an exciter ventilation groove (19) for cooling an electrodynamic exciter (4) is connected to the platform box (18).
4. The platform for multi-factor aging stress control of stator bars of large hydro-generators according to claim 1, characterized in that the intelligent signal generator (2) is a signal generator of an integrated closed-loop control module based on STM32 chip design.
5. A multi-factor aging stress control method for a stator bar of a large hydraulic generator adopts the multi-factor aging stress control platform for the stator bar of the large hydraulic generator, which is characterized by comprising thermal stress control, electrical stress control and mechanical stress control;
the thermal stress control is specifically as follows: the whole stator bar (9) is heated by a heating plate (7), and the power supply of the heating plate (7) is provided by a temperature control box (12); the closed heat insulation structure of the platform box (18) enables the temperature of the heating plate (7) to rise rapidly and be maintained in a set range, and the process of thermal aging of a stator bar in an actual unit is simulated really;
thermocouples (11) are uniformly distributed on the heating plate (7), the temperature of the heating plate (7) is monitored in real time through the thermocouples (11) and fed back to the temperature control box (12) in real time, when the monitored temperature reaches the set temperature in the temperature control box (12), the temperature control box (12) disconnects the power supply of the heating plate (7) to stop heating the whole stator bar (9), and when the monitored temperature is lower than the set temperature, the temperature control box (12) closes the power supply of the heating plate (7) to continue heating the whole stator bar (9);
the electrical stress control comprises: high-voltage alternating current is provided for the whole stator bar (9) during electrical aging through a transformer (17) connected with a high-voltage cable (10), and because an insulating ejector rod is insulated and an electrodynamic vibration exciter (4) is insulated from the ground through a supporting insulator (16), electrical and mechanical thermal aging factors can be simultaneously applied to the whole stator bar (9);
the mechanical stress control is specifically as follows: mechanical stress for mechanical aging of the whole stator bar (9) is provided through the electric vibration exciter (4), the intelligent signal generator (2) outputs a sine signal, the sine signal is amplified through the power amplifier (3), then the sine signal is connected into the electric vibration exciter (4) to generate exciting force, the size and the frequency of the output signal are changed through the intelligent signal generator (2), the gain of the power amplifier (3) is adjusted, and the size and the frequency of the exciting force output by the electric vibration exciter (4) are changed;
the acceleration of the insulating ejector rod is measured through the piezoelectric force sensor (5) and the charge amplifier (6), and is fed back to the intelligent signal generator (2) in real time, so that the closed-loop control of mechanical stress is realized; the intelligent signal generator (2) adjusts the size and the frequency of an output sinusoidal signal in real time according to the actual acceleration, so that the vibration amplitude and the frequency of the whole stator bar (9) are always kept in a given range.
6. The multifactor aging stress control method for stator bars of large-scale hydraulic generators of claim 5 is characterized in that the transformer (17) is provided with an automatic protection device and a monitoring device, the output voltage can be monitored in real time, the power supply can be cut off immediately when a fault occurs, and the voltage can be automatically adjusted back to the set value when deviating from the set value.
7. The multifactorial aging stress control method for the stator bar of the large-scale hydraulic generator according to claim 5, characterized in that an exciter cooling system (13) for ventilating an exciter ventilating groove (19) to cool the electric exciter (4) is connected to the platform box (18), and the electric exciter (4) is ventilated and cooled through the exciter ventilating groove (19) in real time when in operation.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113267713A (en) * | 2021-05-28 | 2021-08-17 | 东方电气集团东方电机有限公司 | Winding insulation electric-thermal-mechanical combined accelerated aging device and method |
| CN114578225A (en) * | 2022-02-28 | 2022-06-03 | 华北电力大学（保定） | Device and method for simulating insulation wear of stator winding |
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| CN114578225A (en) * | 2022-02-28 | 2022-06-03 | 华北电力大学（保定） | Device and method for simulating insulation wear of stator winding |
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