CN211825602U - Fault diagnosis device for salt spray test slip ring system based on current detection - Google Patents
Fault diagnosis device for salt spray test slip ring system based on current detection Download PDFInfo
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- CN211825602U CN211825602U CN202020019303.9U CN202020019303U CN211825602U CN 211825602 U CN211825602 U CN 211825602U CN 202020019303 U CN202020019303 U CN 202020019303U CN 211825602 U CN211825602 U CN 211825602U
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Abstract
The utility model discloses a fault diagnosis device of a slip ring system based on current detection in a salt spray test, which comprises a test system, a water tank, a water; the first end of the driving system is connected with a power grid, and the second end of the driving system is connected with the slip ring system to drive the slip ring system to rotate; the voltage regulating system is connected with a power grid and provides voltage and current required by the slip ring system; and the first end of the information acquisition system is connected with a power grid through the voltage regulation system, and the second end of the information acquisition system is connected with the slip ring system, so that the current information of the slip ring system is acquired and detected in real time, and the fault diagnosis is completed. The utility model provides a marine environment of marine wind power strong corrosivity slip ring system failure diagnosis difficulty's problem, simulated ocean salt fog environment indoor, reduced the harsh condition of slip ring system at marine operation, made things convenient for the investigation of slip ring system trouble problem.
Description
Technical Field
The utility model relates to a wind power generation technical field, concretely relates to experimental sliding ring system fault diagnosis device of salt fog based on current detection.
Background
Offshore wind power has the advantages of abundant wind resource reserves, little environmental pollution, no occupation of cultivated land and the like, and is gradually becoming the key field of wind power development. With the rapid development of domestic wind driven generators, the installation amount of a double-fed wind driven generator (DFIG) is continuously improved, but the part of the double-fed wind driven generator (DFIG) installed in high altitude above the sea surface is corroded by salt spray, ocean atmosphere and spray splashing, so that the double-fed wind driven generator is complex in corrosion prevention work, difficult to maintain and large in workload. Offshore wind power is in a strong corrosive marine environment, and the problem of corrosion protection is facing a huge challenge. According to investigation, slip ring system faults account for more than 20% of the total faults of a doubly-fed wind generator (DFIG). The slip ring system with high reliability and low maintenance is designed to have certain engineering significance for a double-fed wind generating set (DFIG).
At present, the corrosion prevention work of domestic offshore wind turbines does not have a unified standard, the slip ring corrosion test of the offshore wind turbines and the traditional salt spray corrosion test are generally used for corrosion tests of materials in a static state, the chemical corrosion resistance of the materials is mainly researched, and the related slip ring system corrosion performance test is not available.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a salt spray test sliding ring system fault diagnosis device based on current detection. The device solves the problem that the slip ring system is difficult to diagnose in marine environment with strong corrosivity of offshore wind power, simulates an ocean salt spray environment indoors, reduces harsh conditions of the slip ring system in operation at sea, and facilitates troubleshooting of the slip ring system.
In order to achieve the purpose, the utility model provides a fault diagnosis device of a salt spray test slip ring system based on current detection, which comprises a test system, a driving system, a pressure regulating system and an information acquisition system; the test system is arranged outside the slip ring system, is connected with a power grid and provides a salt spray test environment for the slip ring system; the first end of the driving system is connected with a power grid, and the second end of the driving system is connected with the slip ring system to drive the slip ring system to rotate; the voltage regulating system is connected with the power grid, regulates the voltage provided by the power grid and provides the voltage and the current required by the slip ring system; and the first end of the information acquisition system is connected with a power grid through the voltage regulation system, and the second end of the information acquisition system is connected with the slip ring system, so that the current information of the slip ring system is acquired and detected in real time, and the fault diagnosis is completed.
Most preferably, the test system comprises a spray tower, a salt spray test chamber and an air compressor; the slip ring system is arranged in the salt spray test box; the spraying tower is arranged in the salt spray test box and is used for spraying salt spray into the salt spray test box; the air compressor sets up on the salt fog proof box, and first end is connected with the electric wire netting, and the inside intercommunication of second end and salt fog proof box provides sufficient jet-propelled pressure for the salt fog proof box.
Most preferably, the driving system comprises a three-phase driving motor, a coupling and a frequency converter; the first end of the three-phase driving motor is connected with a power grid through a frequency converter, and the second end of the three-phase driving motor is connected with a coupler; the shaft coupling penetrates through the salt spray test box and is connected with the slip ring system; the central axis of the three-phase driving motor is superposed with the central axes of the coupler and the slip ring system, and the slip ring system is driven to rotate through the coupler; the frequency converter is used for adjusting the rotating speed of the three-phase driving motor.
Most preferably, a first bracket and a second bracket are respectively arranged below the three-phase driving motor and the slip ring system to stably support the three-phase driving motor and the slip ring system.
Most preferably, the information acquisition system comprises a voltage sensor, a current sensor, a vibration sensor and a computer; the first end of the current sensor is connected with the voltage regulating system, and the second end of the current sensor is connected with the slip ring system through the voltage sensor, so that the current information of the slip ring system is collected in real time; the voltage sensor collects voltage information of the slip ring system in real time; the vibration sensor is arranged on the slip ring system and used for acquiring vibration information of the slip ring system in real time; the current sensor, the voltage sensor and the vibration sensor are also connected with a computer and used for transmitting the acquired voltage, current and vibration information of the slip ring system; and the computer receives the voltage, current and vibration information of the slip ring system, detects the current information of the slip ring system in real time and completes fault diagnosis according to the current information of the slip ring system.
Most preferably, the computer receives current information of the slip ring system, generates a current oscillogram according to the current information of the slip ring system and/or calculates a current harmonic distortion rate to judge whether the slip ring system has a fault; the generated current waveform diagram is used for judging whether the slip ring system has a fault or not by observing the shape and the intermittent condition of the current waveform diagram; the current harmonic distortion rate is calculated by performing Fourier decomposition on the current information of the slip ring system, and the current harmonic distortion rate is compared with a distortion rate threshold value to judge whether the slip ring system has a fault.
Most preferably, the number of the voltage sensors and the number of the current sensors are three, and the three voltage sensors and the three current sensors are connected in parallel to acquire three-phase voltage information and three-phase current information of the slip ring system in real time.
Most preferably, the voltage regulating system comprises a variable frequency power supply and a voltage regulator which are connected in parallel; the first end of the variable frequency power supply and the voltage regulator which are connected in parallel is connected with a power grid, and the second end of the variable frequency power supply and the voltage regulator which are connected in parallel is connected with a current sensor; the voltage regulator is used for providing voltage and current required by the power frequency gliding ring system; the variable frequency power supply is used for providing voltage and current required by the slip-ring system at other frequencies.
Most preferably, the voltage regulating system is also connected with the current sensor through a power resistor; the power resistor is used for limiting the current provided by the voltage regulator and protecting the safety of the circuit.
Most preferably, the brushes in the slip ring system are pre-ground before testing so that the brushes can be precisely attached to the slip rings in the slip ring system during testing.
The application of the utility model discloses, solved the marine environment of marine wind power strong corrosivity problem of slip ring system failure diagnosis difficulty, simulated the ocean salt fog environment indoor, reduced the harsh condition of slip ring system at marine operation, made things convenient for the investigation of slip ring system trouble problem.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the utility model provides a slip ring system fault diagnosis device passes through salt fog test box at indoor simulation ocean salt fog environment to set up conditions such as voltage, electric current and the frequency of slip ring system, the harsh condition of reduction slip ring system at marine operation has made things convenient for the investigation of slip ring system trouble problem.
2. The utility model provides a slip ring system fault diagnosis device has effectively promoted the design of the slip ring system of high reliability, low maintenance.
Drawings
Fig. 1 is a schematic structural diagram of a slip ring system fault diagnosis device provided by the present invention;
fig. 2 is a voltage and current waveform diagram of the slip ring system collected before the salt spray test of the slip ring system provided by the present invention;
fig. 3 is the voltage and current waveform diagram of the slip ring system collected after the salt spray test is performed on the slip ring system.
Detailed Description
The present invention will be further described with reference to the following embodiments, which are only used for illustrating the present invention and are not intended to limit the scope of the present invention.
The utility model relates to a salt spray test slip ring system fault diagnosis device based on current detection, as shown in figure 1, the device comprises a test system, a driving system, a pressure regulating system and an information acquisition system; a main switch 2 is arranged on the power grid 1 and used for controlling the power supply condition of the whole device; the test system is arranged outside the slip ring system 12, is connected with the power grid 1 and provides a salt spray test environment for the slip ring system 12; the first end of the driving system is connected with the power grid 1, and the second end of the driving system is connected with the slip ring system 12 to drive the slip ring system 12 to rotate; the voltage regulating system is connected with the power grid 1, regulates the voltage provided by the power grid 1 and provides the voltage and the current required by the slip ring system 12; and the first end of the information acquisition system is connected with the power grid 1 through the voltage regulation system, the second end of the information acquisition system is connected with the slip ring system 12, the current information of the slip ring system 12 is acquired and detected in real time, the current harmonic distortion rate is calculated and compared with the distortion rate threshold value, whether the slip ring system 12 has a fault or not is judged, and fault diagnosis is completed.
The test system comprises a spray tower 9, a salt spray test box 10 and an air compressor 17; the slip ring system 12 is arranged inside the salt spray test box 10; the spraying tower 9 is arranged inside the salt spray test box 10 and is used for spraying salt spray into the salt spray test box 10; the air compressor 17 is arranged on the salt spray test box 10, the first end of the air compressor is connected with the power grid 1, and the second end of the air compressor is communicated with the inside of the salt spray test box 10; the air compressor 17 is a corollary device of the salt spray test chamber 10 and mainly provides enough proper air injection pressure for the salt spray test chamber.
The driving system comprises a three-phase driving motor 15, a coupler 13 and a frequency converter 16; a first end of a three-phase driving motor 15 is connected with the power grid 1 through a frequency converter 16, and a second end of the three-phase driving motor is connected with a coupler 13; the shaft coupling 13 penetrates through the salt spray test box 10 and is connected with the slip ring system 12; the central axis of the three-phase driving motor 15 is coincided with the central axes of the coupler 13 and the slip ring system 12, so that the central difference and the angle difference between the central axis of the three-phase driving motor 15 and the central axis of the slip ring system 12 are both zero, the three-phase driving motor 15 drives the slip ring system 12 through the coupler 13, the slip ring system 12 operates normally, and a test result with higher reliability is obtained; the frequency converter 16 is used to regulate the rotational speed of the three-phase drive motor 15.
A first bracket 14 and a second bracket 11 are respectively arranged below the three-phase driving motor 15 and the slip ring system 12 to stably support the three-phase driving motor 15 and the slip ring system 12.
The information acquisition system comprises a voltage sensor 5, a current sensor 7, a vibration sensor 18 and a computer 8. The first end of the current sensor 7 is connected with the voltage regulating system, the second end of the current sensor is connected with the slip ring system 12 through the voltage sensor 5, and current information of the slip ring system 12 is collected in real time; the voltage sensor 5 collects the voltage information of the slip ring system 12 in real time; the vibration sensor 18 is arranged on the slip ring system 12 and used for collecting vibration information of the slip ring system 12 in real time; the current sensor 7, the voltage sensor 5 and the vibration sensor 18 are also connected with the computer 8, and the collected voltage, current and vibration information of the slip ring system 12 is transmitted to the computer 8. The computer 8 detects the received voltage and current information of the slip ring system 12 in real time, and generates a voltage waveform diagram and a current waveform diagram on the computer 8 to observe whether the voltage and the current passing through the slip ring system 12 have an intermittent condition; the acquisition of voltage, current and vibration information is set to be carried out after the experiment is started, the experiment is ended and the experiment is carried out for a period of time, so that the information is prevented from being excessively acquired and causing information redundancy.
The number of the voltage sensors 5 and the number of the current sensors 7 are three, and the three voltage sensors and the three current sensors are connected in parallel to acquire three-phase voltage information and three-phase current information of the slip ring system 12 in real time.
As shown in fig. 2 and 3, the voltage waveform diagram and the current waveform diagram of the slip ring system 12 generated on the computer 8 before and after the salt spray test of the slip ring system 12 are respectively shown, the upper curve is the voltage waveform diagram passing through the slip ring system 12, and the lower curve is the current waveform diagram passing through the slip ring system 12, so that it can be obviously seen that when the slip ring system 12 is not in fault, the current waveform diagram on the computer 8 presents a continuous sinusoidal waveform, when the slip ring system 12 is in fault, the current waveform diagram on the computer 8 has large distortion, and when the waveform amplitude is large, the waveform amplitude is small, and when the current amplitude is serious, the current phase loss can be caused.
In practical application, the harmonic distortion rate can be calculated through the three-phase current information of the slip ring system 12 received by the computer 8, so that alarm information can be sent out in time. The three-phase current information is respectively Ias(t),Ibs(t), Ics(t); the computer 8 receives the three-phase current information I of the slip ring system 12as(t),Ibs(t),Ics(t) respectively carrying out Fourier decomposition calculation to obtain a current harmonic distortion rate, wherein the current harmonic distortion rate is ITHD and satisfies the following conditions:
wherein, InFor fourier decomposition of the nth frequency component, n is 1,2,3.. n, and satisfies:
wherein, an,bnThe Fourier decomposition frequency component coefficients respectively take the a-phase current information as an example, and respectively satisfy the following conditions:
wherein T is a power frequency period, and w is a frequency corresponding to the power frequency period; i isasAnd (t) is a-phase current information of the slip ring system 12 acquired by the current sensor 7.
The distortion threshold is obtained by comparing the current harmonic distortion rate ITHD with a distortion threshold, the distortion threshold is set to 5% according to related national standards, if the current harmonic distortion rate ITHD exceeds the distortion threshold, a fault of poor contact, ignition of the slip ring or uneven surface of the slip ring exists between the slip ring systems 12, and if the current harmonic distortion rate ITHD does not exceed the distortion threshold, the slip ring system 12 does not have a fault. Other conventional methods may be used for calculating the harmonic distortion rate, and this patent is not limited thereto.
The voltage regulating system comprises a variable frequency power supply 3 and a voltage regulator 4 which are connected in parallel; the first end of the variable frequency power supply 3 connected with the voltage regulator 4 in parallel is connected with the power grid 1, and the second end of the variable frequency power supply connected with the voltage regulator is connected with the current sensor 7; the voltage regulator 4 is used for providing low voltage and large current required by the power frequency gliding ring system 12; the variable frequency power supply 3 is used for providing voltage and current required by the slip ring system 12 at other frequencies; the variable frequency power supply 3 needs to provide an operating frequency of around 10Hz for the slip ring system 12.
The voltage regulating system is also connected with a current sensor 7 through a power resistor 6; the power resistor 6 is within 10 ohms and used for limiting the current provided by the voltage regulator 4, preventing the input current from being overlarge, avoiding the damage of the variable frequency power supply 3 and the slip ring system 12 and protecting the safety of a circuit; the power resistor 6 is cooled by an industrial fan or the like.
The electric brush in the slip ring system 12 needs to be subjected to a pre-grinding process before the test, so that the electric brush in the slip ring system 12 can be precisely attached to the slip ring in the slip ring system 12 in the test, and large friction cannot be generated; the pre-grinding of the electric brush in the slip ring system 12 needs to adopt fine sand paper with more than 800 meshes, the fine sand paper surrounds the surface of the slip ring in the slip ring system 12 and is bonded by glue; the pre-grinding is completed by rotating for half a minute when the frequency converter 16 adjusts the three-phase driving motor 15 to a lower rotation speed.
The surface of an electric brush in the slip ring system 12 is rough before pre-grinding, the diffuse reflection is strong, the gray scale part appears under a microscope, the contact surface with the slip ring in the slip ring system 12 is small, the contact resistance is small, and the contact current can be intermittent; the surface of the brush in the slip ring system 12 is relatively flat after pre-grinding, which can be better displayed under a microscope, and the contact area between the brush and the slip ring in the slip ring system 12 is increased.
The influence factors influencing the salt spray test of the slip ring system 12 comprise temperature, humidity, material composition of the slip ring system 12, test time, rotating speed of the three-phase driving motor 15, concentration of salt spray, current, voltage, frequency and the like passing through the slip ring system 12, so that the salt spray test of the slip ring system 12 adopts a variable control method, relevant parameters such as temperature, humidity and salt spray concentration in the salt spray test box 10 are set according to national standards, and the rotating speed of an electric brush in the slip ring system 12 is controlled to be a rated rotating speed.
The utility model discloses a theory of operation:
and the voltage regulating system is used for regulating the voltage provided by the power grid, providing the voltage and the current required by the slip ring system, driving the slip ring system to rotate by the driving system under the salt spray environment provided by the test system, acquiring and detecting the voltage and current information passing through the slip ring system in real time by the information acquisition system, and completing fault diagnosis according to the current information.
To sum up, the utility model relates to a salt spray test sliding ring system fault diagnosis device based on current detection has solved the marine environment of the strong corrosivity of offshore wind power problem of ring system fault diagnosis difficulty down, has simulated the ocean salt fog environment at indoor, has reduced the harsh condition of sliding ring system at marine operation, has made things convenient for the investigation of sliding ring system fault problem.
While the present invention has been described in detail with reference to the preferred embodiments thereof, it should be understood that the above description should not be taken as limiting the present invention. Numerous modifications and alterations to the present invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be limited only by the attached claims.
Claims (8)
1. A fault diagnosis device of a salt spray test slip ring system based on current detection is characterized by comprising:
the test system is arranged outside the slip ring system, is connected with a power grid and provides a salt spray test environment for the slip ring system;
the first end of the driving system is connected with a power grid, and the second end of the driving system is connected with the slip ring system to drive the slip ring system to rotate;
the voltage regulating system is connected with the power grid, regulates the voltage provided by the power grid and provides the voltage and the current required by the slip ring system;
and the first end of the information acquisition system is connected with a power grid through the voltage regulation system, and the second end of the information acquisition system is connected with the slip ring system, so that the current information of the slip ring system is acquired and detected in real time, and the fault diagnosis is completed.
2. The current detection based salt spray test slip ring system fault diagnosis device of claim 1, wherein the test system comprises a spray tower, a salt spray test box and an air compressor; the slip ring system is arranged inside the salt spray test box; the spraying tower is arranged in the salt spray test box and is used for spraying salt spray into the salt spray test box; the air compressor is arranged on the salt spray test box, the first end of the air compressor is connected with a power grid, the second end of the air compressor is communicated with the inside of the salt spray test box, and sufficient air injection pressure is provided for the salt spray test box.
3. The fault diagnosis device for the salt fog test slip ring system based on current detection as claimed in claim 2, wherein the driving system comprises a three-phase driving motor, a coupling and a frequency converter; the first end of the three-phase driving motor is connected with a power grid through the frequency converter, and the second end of the three-phase driving motor is connected with the coupler; the coupling penetrates through the salt spray test box and is connected with the slip ring system; the central axis of the three-phase driving motor is superposed with the central axes of the coupler and the slip ring system, and the slip ring system is driven to rotate through the coupler; the frequency converter is used for adjusting the rotating speed of the three-phase driving motor.
4. The fault diagnosis device for the salt fog test slip ring system based on current detection as claimed in claim 3, wherein a first bracket and a second bracket are respectively arranged below the three-phase driving motor and the slip ring system for stably supporting the three-phase driving motor and the slip ring system.
5. The current detection based salt spray test slip ring system fault diagnosis device of claim 4, wherein the information acquisition system comprises a voltage sensor, a current sensor, a vibration sensor and a computer;
the first end of the current sensor is connected with the voltage regulating system, and the second end of the current sensor is connected with the slip ring system through the voltage sensor, so that the current information of the slip ring system is acquired in real time;
the voltage sensor collects voltage information of the slip ring system in real time;
the vibration sensor is arranged on the slip ring system and is used for acquiring vibration information of the slip ring system in real time;
the current sensor, the voltage sensor and the vibration sensor are also connected with the computer and used for transmitting the acquired voltage, current and vibration information of the slip ring system;
the computer receives the voltage, current and vibration information of the slip ring system, detects the current information of the slip ring system in real time and completes fault diagnosis according to the current information of the slip ring system;
the computer receives the current information of the slip ring system and generates a current oscillogram according to the current information of the slip ring system to judge whether the slip ring system has a fault; the generated current waveform diagram is used for judging whether the slip ring system has a fault or not by observing the shape and the intermittent condition of the current waveform diagram.
6. The fault diagnosis device for the salt spray test slip ring system based on current detection as claimed in claim 5, wherein the number of the voltage sensors and the number of the current sensors are three and are connected in parallel, and three-phase voltage information and three-phase current information of the slip ring system are collected in real time.
7. The fault diagnosis device for the salt fog test slip ring system based on current detection as claimed in claim 6, wherein the voltage regulating system comprises a variable frequency power supply and a voltage regulator which are connected in parallel; the first end of the variable frequency power supply, which is connected with the voltage regulator in parallel, is connected with a power grid, and the second end of the variable frequency power supply, which is connected with the voltage regulator in parallel, is connected with the current sensor; the voltage regulator is used for providing voltage and current required by the power frequency gliding ring system; the variable frequency power supply is used for providing voltage and current required by the slip ring system at frequencies except power frequency.
8. The fault diagnosis device for the salt fog test slip ring system based on current detection as claimed in claim 7, wherein the voltage regulating system is further connected with the current sensor through a power resistor; the power resistor is used for limiting the current provided by the voltage regulator and protecting the safety of a circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020019303.9U CN211825602U (en) | 2020-01-06 | 2020-01-06 | Fault diagnosis device for salt spray test slip ring system based on current detection |
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| CN202020019303.9U CN211825602U (en) | 2020-01-06 | 2020-01-06 | Fault diagnosis device for salt spray test slip ring system based on current detection |
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| CN202020019303.9U Active CN211825602U (en) | 2020-01-06 | 2020-01-06 | Fault diagnosis device for salt spray test slip ring system based on current detection |
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