CN118066126A - Transformer submersible pump bore sweeping fault simulation device and evaluation method - Google Patents
Transformer submersible pump bore sweeping fault simulation device and evaluation method Download PDFInfo
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- 238000010408 sweeping Methods 0.000 title claims abstract description 61
- 238000011156 evaluation Methods 0.000 title claims description 28
- 238000004088 simulation Methods 0.000 title claims description 18
- 238000005086 pumping Methods 0.000 claims abstract description 44
- 238000005259 measurement Methods 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000007789 sealing Methods 0.000 claims abstract description 13
- 239000007789 gas Substances 0.000 claims description 51
- 238000004364 calculation method Methods 0.000 claims description 36
- 238000001514 detection method Methods 0.000 claims description 27
- 238000006243 chemical reaction Methods 0.000 claims description 17
- 238000012544 monitoring process Methods 0.000 claims description 17
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 16
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 claims description 16
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 claims description 16
- 229910052739 hydrogen Inorganic materials 0.000 claims description 16
- 239000001257 hydrogen Substances 0.000 claims description 16
- 239000004215 Carbon black (E152) Substances 0.000 claims description 15
- 229930195733 hydrocarbon Natural products 0.000 claims description 15
- 150000002430 hydrocarbons Chemical class 0.000 claims description 15
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- 230000009471 action Effects 0.000 claims description 6
- 238000002604 ultrasonography Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 210000000038 chest Anatomy 0.000 claims 1
- 238000003745 diagnosis Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 8
- 238000004590 computer program Methods 0.000 description 7
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- 238000001914 filtration Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 230000008054 signal transmission Effects 0.000 description 3
- 238000013480 data collection Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
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- 238000009792 diffusion process Methods 0.000 description 1
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Abstract
The application belongs to the technical field of transformer fault diagnosis, and relates to a device and a method for simulating a transformer submersible pump bore sweeping fault, wherein the method comprises the following steps: the connecting piece is arranged on the submersible pump shaft between the impeller and the rotor through a bearing; one end of the first corrugated pipe is connected with the side surface of the connecting piece in a sealing way, the other end of the first corrugated pipe is connected with the inner wall of the oil-submerged pump shell, a first oil outlet is arranged on the pipe wall of the first corrugated pipe, the first oil outlet is connected with a first valve, and the first valve is connected with a first oil pumping device; the second corrugated pipe and the first corrugated pipe are symmetrically arranged relative to the submersible pump shaft, a motor and a baffle are arranged in the second corrugated pipe, and the baffle is connected with the motor through a traction rope; an inclination angle measurement module; operating a data acquisition module; an upper computer; according to the application, the working states of the first oil outlet, the first valve and the first oil pumping device and the motor voltage are controlled, and the first corrugated pipe and the second corrugated pipe are controlled to compress or extend, so that the fault of the submersible pump in the case of different inclination angles of the submersible pump shaft is simulated.
Description
Technical Field
The invention relates to the technical field of transformer fault diagnosis, in particular to a device for simulating a transformer submersible pump bore sweeping fault and an evaluation method.
Background
The high-capacity transformer in the power system generally adopts a strong oil circulation mode to dissipate heat, and the oil-submerged pump has a vital function as a strong oil circulation power source. Because the submersible pump lacks a corresponding network access detection means, the process of the submersible pump cannot be strictly controlled, and when the submersible pump fails, the submersible pump also lacks a corresponding electrified detection means, and the failure of the submersible pump cannot be sensed on line, so that the failure is further expanded, and the normal operation of a transformer is influenced. The most common fault of the oil-submerged pump is a stator-rotor bore-sweeping fault, metal particles generated after the bore-sweeping fault occurs can enter the main transformer body to cause partial discharge, and the more serious the bore-sweeping fault is, the more damage to the transformer is caused.
Because the operation data such as ultrasonic signals, vibration signals, the content of dissolved gas in oil and three-phase current of a submersible pump stator of the submersible pump can only be monitored when the submersible pump is operated, the chamber sweeping fault can not be directly monitored, and therefore, the chamber sweeping fault detection can be better carried out in the operation process of the submersible pump only by acquiring the correlation among the ultrasonic signals, the vibration signals, the content of dissolved gas in oil and the three-phase current of the submersible pump stator and the chamber sweeping fault, and the data support is provided for the operation and maintenance of the submersible pump.
The precondition of obtaining the correlation between each item of operation data of sweeping fault and oil-submerged pump is to carry on sweeping fault simulation, but the study of sweeping fault of oil-submerged pump is less in the prior art, the patent of publication No. CN105697353B discloses a kind of variable working condition hydraulic pump fault simulation and state detection integrated test device, replace part of normal parts of the tested pump with the fault piece, thus study the hydraulic pump operation state under different fault states, for example, when doing the plunger fault of the swash plate pump, use the fault plunger to replace the normal plunger in the tested pump, when doing the gear abrasion fault of the gear pump, will be tested the tooth surface of the normal gear in the pump is polished manually, make its meshing curve lose efficacy and thus carry on the fault simulation. But the device can not simulate the submersible pump bore-sweeping fault, and the correlation between the bore-sweeping fault and the submersible pump ultrasonic signal, the vibration signal, the dissolved gas in oil and the three-phase current of the submersible pump stator can not be researched through the device.
In view of the foregoing, it is desirable to design a device for simulating a submersible pump bore-sweeping fault, so as to provide data support for fault detection and maintenance of the submersible pump based on the correlation between the bore-sweeping fault and various operation data of the submersible pump.
Disclosure of Invention
Therefore, the invention aims to solve the technical problems that the correlation between the sweeping fault and various operation data of the submersible pump cannot be studied due to the lack of a device for simulating the submersible pump sweeping fault in the prior art, and thus the data support cannot be provided for fault detection and maintenance of the submersible pump.
In order to solve the technical problems, the invention provides a device for simulating a fault of a submersible pump of a transformer, which comprises the following components:
The connecting piece is arranged on the submersible pump shaft between the impeller and the rotor in parallel through a bearing, the inner ring of the bearing is fixedly connected with the submersible pump shaft, and the outer ring of the bearing is fixedly connected with the connecting piece;
One end of the first corrugated pipe is in sealing connection with the side surface of the connecting piece, the other end of the first corrugated pipe is in sealing connection with the inner wall of the oil-submerged pump shell, a first oil outlet is arranged on the pipe wall of the first corrugated pipe, the first oil outlet is connected with a first valve, and the first valve is connected with a first oil pumping device;
The second corrugated pipe is symmetrically arranged with the first corrugated pipe about the submersible pump shaft, one end of the second corrugated pipe is in sealing connection with the side surface of the connecting piece, the other end of the second corrugated pipe is in sealing connection with the inner wall of the submersible pump shell, a motor is arranged on one side, close to the inner wall of the submersible pump shell, of the second corrugated pipe, a baffle is vertically clamped on one side, close to the connecting piece, of the second corrugated pipe, and the baffle is connected with the motor through a traction rope;
The inclination angle measuring module is used for collecting current inclination data of the submersible pump shaft;
the operation data acquisition module is used for acquiring operation data of the submersible pump when the current inclination angle of the submersible pump shaft is within the preset inclination angle value range;
the upper computer, it specifically includes:
a data processing module, comprising:
The inclination angle acquisition sub-module is in communication connection with the inclination angle measurement module and is used for acquiring the current inclination angle of the submersible pump shaft based on the current inclination data of the submersible pump shaft;
The fault state evaluation sub-module is in communication connection with the operation data acquisition module and is used for evaluating the severity of the sweeping fault of the submersible pump shaft under the current inclination angle based on the operation data of the submersible pump;
The control module is in communication connection with the first valve, the first oil pumping device, the first oil outlet and the motor, and is used for controlling the voltage of the motor to be increased when the current inclination angle of the submersible pump shaft is smaller than the minimum value of the preset inclination angle range, so that the traction rope is contracted, and the baffle drives the second corrugated pipe to be contracted under the action of the tension of the traction rope; simultaneously controlling the first valve and the first oil outlet to be opened, and controlling the first oil pumping device to inject oil into the first corrugated pipe, so that the first corrugated pipe stretches until the current inclination angle of the submersible pump shaft is within a preset inclination angle value range; when the current inclination angle of the submersible pump shaft is larger than the maximum value of the preset inclination angle value range, controlling the motor voltage to be reduced, so that the traction rope stretches, and the baffle drives the second corrugated pipe to stretch; simultaneously controlling the first valve and the first oil outlet to be opened, and controlling the first oil pumping device to drain oil from the first corrugated pipe, so that the first corrugated pipe is contracted until the current inclination angle of the submersible pump shaft is within a preset inclination angle value range, so as to simulate the submersible pump chamber sweeping fault under the current inclination angle of the submersible pump shaft.
Preferably, the method further comprises:
the first support arm is arranged with the first corrugated pipe in a 90 o -degree phase difference relative to the space of the submersible pump shaft, one end of the first support arm is connected with the side surface of the connecting piece through a grooved mortise and tenon, and the other end of the first support arm is fixedly connected with the inner wall of the submersible pump shell and used for fixing the connecting piece and preventing the connecting piece from sliding along the vertical direction of the submersible pump shaft;
The second support arm is symmetrically arranged on the first support arm relative to the submersible pump shaft, one end of the second support arm is connected with the side surface of the connecting piece through a mortise and tenon joint, and the other end of the second support arm is fixedly connected with the inner wall of the submersible pump shell and used for fixing the connecting piece and preventing the connecting piece from sliding along the vertical direction of the submersible pump shaft.
Preferably, the inclination angle measurement module includes:
The first measurement module, set up directly over the first bellows of oil-submerged pump shell inner wall, it includes:
a first ultraviolet transmitter for transmitting a first ultraviolet signal to the submersible pump shaft;
the first ultraviolet receiver is arranged right above the first ultraviolet transmitter on the inner wall of the oil-submerged pump shell and is used for receiving the first ultraviolet signal and acquiring the receiving position of the first ultraviolet signal, and transmitting the receiving position of the first ultraviolet signal to the inclination angle acquisition sub-module;
The second measuring module and the first measuring module are symmetrically arranged about the submersible pump shaft and comprise;
a second ultraviolet transmitter for transmitting a second ultraviolet signal to the submersible pump shaft;
The second ultraviolet receiver is arranged right below the second ultraviolet transmitter on the inner wall of the oil-submerged pump shell and is used for receiving the second ultraviolet signal and acquiring the receiving position of the second ultraviolet signal and transmitting the receiving position of the second ultraviolet signal to the inclination angle acquisition sub-module.
Preferably, the inclination angle acquisition sub-module calculates the current inclination angle of the submersible pump shaft based on the position of the first ultraviolet emitter, the position of the second ultraviolet emitter, the receiving position of the first ultraviolet signal, the receiving position of the second ultraviolet signal, the vertical distance between the first ultraviolet emitter and the submersible pump stator, the vertical distance between the second ultraviolet emitter and the submersible pump stator, and the vertical distance between the first ultraviolet emitter and the submersible pump shaft when the inclination angle of the submersible pump shaft is 0;
The calculation formula of the current inclination angle of the submersible pump shaft is as follows:
，
wherein, Representing the current inclination angle of the submersible pump shaft; /(I)Representing a distance between the first ultraviolet transmitter and the first ultraviolet signal receiving location; /(I)Representing a distance between the second ultraviolet transmitter and the second ultraviolet signal receiving location; /(I)Representing a vertical distance between the first ultraviolet emitter and the submersible pump shaft when the submersible pump shaft is inclined at an angle of 0; /(I)Representing a vertical distance between the first ultraviolet emitter and the submersible pump stator; /(I)Representing the vertical distance between the second ultraviolet emitter and the stator of the submersible pump.
Preferably, the operation data acquisition module comprises:
The gas monitoring module is used for monitoring the content of dissolved gas in oil in an oil tank of the submersible pump under the current inclination angle of the submersible pump shaft and transmitting the content of the dissolved gas in the oil to the fault state evaluation sub-module; wherein the dissolved gas content in the oil comprises hydrogen concentration, acetylene concentration and total hydrocarbon concentration;
the ultrasonic signal detection module is used for monitoring an ultrasonic signal of the submersible pump under the current inclination angle of the submersible pump shaft and transmitting the ultrasonic signal to the fault state evaluation sub-module;
The vibration signal detection module is used for monitoring a vibration signal of the submersible pump at the current inclination angle of the submersible pump shaft and transmitting the vibration signal to the fault state evaluation sub-module;
And the winding three-phase current detection module is used for detecting the three-phase current of the submersible pump stator under the current inclination angle of the submersible pump shaft and transmitting the three-phase current of the submersible pump stator to the fault state evaluation sub-module.
Preferably, the fault state evaluation submodule includes:
The oil pump comprises an oil dissolved gas content state quantity calculating unit, a water pump and a water pump, wherein the oil dissolved gas content state quantity calculating unit is used for calculating the oil dissolved gas content state quantity under the current inclination angle of the oil pump shaft based on the content of the dissolved gas in the oil;
The ultrasonic signal state quantity calculating unit is used for calculating the difference value between the ultrasonic signal and the standard ultrasonic signal, carrying out Fourier transform on the difference value to obtain a target signal, and calculating the ultrasonic signal state quantity of the submersible pump shaft under the current inclination angle based on a low-frequency component and a high-frequency component in the target signal; the standard ultrasonic signal is an ultrasonic signal of the submersible pump when the inclination angle of the submersible pump shaft is 0;
The vibration signal state quantity calculating unit is used for decomposing the vibration signal into an N-order harmonic signal and a direct current component signal by adopting Fourier series conversion, calculating single-period speed root-mean-square value of each harmonic signal respectively, calculating the integral speed root-mean-square value of the N-order harmonic signal based on the single-period speed root-mean-square value of each harmonic signal and the speed root-mean-square value of the direct current component signal, and calculating the vibration signal state quantity of the submersible pump shaft under the current inclination angle based on the integral speed root-mean-square value of the N-order harmonic signal;
The submersible pump stator three-phase current state quantity calculating unit is used for respectively decomposing the submersible pump stator three-phase current into M harmonic signals by adopting Fourier series conversion, respectively calculating three-phase current distortion rate based on the M harmonic signals corresponding to the three-phase current, and calculating the submersible pump stator three-phase current state quantity under the current inclination angle of the submersible pump shaft based on the three-phase current distortion rate;
The device comprises a scan bore fault severity assessment unit, a scan bore fault severity assessment unit and a scan bore fault severity unit, wherein the scan bore fault severity unit is used for calculating an operation state quantity of an oil-submerged pump based on a state quantity of dissolved gas content in oil, an ultrasonic signal state quantity, a vibration signal state quantity and a three-phase current state quantity of a stator of the oil-submerged pump, and assessing the scan bore fault severity of the oil-submerged pump under the current inclination angle of the oil-submerged pump shaft based on the operation state quantity of the oil-submerged pump.
Preferably, the calculation formula of the state quantity of the dissolved gas content in the oil is:
，
wherein, Indicating the state quantity of the dissolved gas in the oil; /(I)Represents a hydrogen concentration coefficient, when the hydrogen concentration is less than 30,/>When the hydrogen concentration is 30 or more and 150 or less,/>When the hydrogen concentration is 150 or more,；/>Represents the acetylene concentration coefficient, when the acetylene concentration is less than 1,/>When the acetylene concentration is 1 or more and less than 5,/>When the acetylene concentration is 5 or more,/>；/>Representing the total hydrocarbon concentration coefficient, when the total hydrocarbon concentration is less than 20,When the total hydrocarbon concentration is 20 or more and less than 150,/>When the total hydrocarbon concentration is 150 or more,/>。
Preferably, the calculation formula of the target signal is:
，
wherein, Representing the target signal,/>Representing ultrasound signals,/>Representing standard ultrasound signals,/>Representing imaginary number,/>Represents the angular frequency of the argument;
The calculation formula of the low-frequency component in the target signal is as follows:
，
wherein, Representing the target Signal/>Low frequency components of (a);
the calculation formula of the high-frequency component in the target signal is as follows:
，
wherein, Representing the target Signal/>High frequency components of (a);
The calculation formula of the ultrasonic signal state quantity is as follows:
,
wherein, Representing the ultrasonic signal state quantity.
Preferably, the formula for decomposing the vibration signal into the N-th harmonic signal by fourier series conversion is:
，
，
，
，
，
wherein, Representing vibration signal,/>Representing the period of the vibration signal,/>Representing harmonic order,/>，Representing the/>, after Fourier series conversion of the vibration signalCosine component coefficient of subharmonic signal,/>Representing the/>, after Fourier series conversion of the vibration signalSinusoidal component coefficient of subharmonic signal,/>Representing a DC component signal after Fourier series conversion of the vibration signal,/>Represents the/>Harmonic phase of subharmonic signal,/>An angular frequency representing the 1 st harmonic signal;
the calculation formula of the root mean square value of the single period speed of each subharmonic signal is as follows:
，
wherein, Represents the/>A single period speed root mean square value of the subharmonic signal;
the calculation formula of the root mean square value of the overall speed of the N harmonic signals is as follows:
，
wherein, Root mean square value of overall velocity representing an N-th harmonic signal,/>Representing the root mean square value of the velocity of a DC component signal,/>；
The calculation formula of the vibration signal state quantity is as follows:
，
wherein, Representing the vibration signal state quantity.
Preferably, the three-phase current distortion rate is calculated by the following formula:
，
，
，
wherein, Represents the A phase current distortion rate,/>Represents the/>, of the phase A currentSubharmonic amplitude,/>，Representing the 1 st harmonic amplitude of the A-phase current,/>Represents B-phase current distortion rate,/>Represents the/>, of the B-phase currentSubharmonic amplitude,/>Representing the 1 st harmonic amplitude of the B-phase current,/>Represents C phase current distortion rate,/>Represents the/>, of the C-phase currentSubharmonic amplitude,/>Representing the 1 st harmonic amplitude of the C-phase current;
the calculation formula of the three-phase current state quantity of the submersible pump stator is as follows:
，
wherein, And the three-phase current state quantity of the submersible pump stator is represented.
Preferably, the calculation formula of the operation state quantity of the submersible pump is:
，
wherein, Representing the running state quantity of the submersible pump,/>Representing the state quantity of dissolved gas in oil,/>Representing ultrasonic signal state quantity,/>Representing the state quantity of vibration signal,/>Representing three-phase current state quantity of the submersible pump stator;
the evaluation of the severity of the sweeping fault of the submersible pump shaft under the current inclination angle based on the running state quantity of the submersible pump comprises the following steps:
If it is Judging that the submersible pump has no sweeping fault, if/>Judging that the oil-submerged pump has a slight sweeping fault, if/>Judging that the oil-submerged pump has moderate sweeping fault, if/>And judging that the submersible pump has serious bore sweeping faults.
Preferably, the method further comprises:
The second oil outlet is arranged on the wall of the second corrugated pipe, the second oil outlet is connected with a second valve, the second valve is connected with a second oil pumping device, and the second oil outlet, the second valve and the second oil pumping device are all in communication connection with the control module.
Preferably, the control module is further adapted to, when in continuousThe obtained relative standard deviation value of the inclination angle of the submersible pump shaft is larger than a preset threshold value, the first valve and the first oil outlet are controlled to be opened, and the first oil pumping device is controlled to inject oil into the first corrugated pipe, so that the first corrugated pipe stretches; simultaneously controlling the second valve and the second oil outlet to be opened, and controlling the second oil pumping device to inject oil into the second corrugated pipe, so that the second corrugated pipe stretches until the second corrugated pipe is continuous/>The acquired relative standard deviation value of the inclination angle of the submersible pump shaft is smaller than or equal to a preset threshold value;
Wherein, continuously The calculation formula of the relative standard deviation value of the inclination angle of the submersible pump shaft is as follows:
，
wherein, Representing the succession/>The relative standard deviation value of the inclination angle of the submersible pump shaft obtained for the second time,/>Representing the acquisition times of the inclination angle of the submersible pump shaftRepresents the/>The next acquired inclination angle of the submersible pump shaft,/>Representation/>The average value of the inclination angles of the submersible pump shafts is acquired next time.
The invention also provides a method for evaluating the fault of the oil-submerged pump of the transformer, which is realized by adopting the device for simulating the fault of the oil-submerged pump of the transformer, and comprises the following steps:
starting the submersible pump to enable the submersible pump to reach a rated rotation speed, collecting current inclination data of the submersible pump shaft, and acquiring the current inclination angle of the submersible pump shaft based on the current inclination data of the submersible pump shaft;
When the current inclination angle of the submersible pump shaft is within a preset inclination angle value range, collecting submersible pump operation data, and evaluating the severity of the sweeping fault of the submersible pump shaft under the current inclination angle based on the submersible pump operation data;
When the current inclination angle of the submersible pump shaft is smaller than the minimum value of the preset inclination angle value range, controlling the voltage of the motor to be increased, thereby controlling the traction rope to shrink, and enabling the baffle to drive the second corrugated pipe to shrink under the action of the tension of the traction rope; simultaneously controlling the first valve and the first oil outlet to be opened, and controlling the first oil pumping device to inject oil into the first corrugated pipe, so that the first corrugated pipe stretches until the current inclination angle of the submersible pump shaft is within the preset inclination angle value range;
When the current inclination angle of the submersible pump shaft is larger than the maximum value of the preset inclination angle value range, controlling the voltage of the motor to be reduced, and controlling the traction rope to extend, so that the baffle drives the second corrugated pipe to extend; simultaneously, the first valve and the first oil outlet are controlled to be opened, and the first oil pumping device is controlled to drain oil from the first corrugated pipe, so that the first corrugated pipe is contracted until the current inclination angle of the submersible pump shaft is within the range of the preset inclination angle.
According to the transformer submersible pump chamber-sweeping fault simulation device, the inclination angle of the submersible pump shaft is obtained, when the inclination angle of the submersible pump shaft is smaller than the minimum value of the preset inclination angle value range, the voltage of the motor arranged in the second corrugated pipe is controlled to be increased, so that the baffle connected with the motor drives the second corrugated pipe to compress under the action of the pulling force of the pulling rope; simultaneously, a first oil outlet arranged on the wall of the first corrugated pipe and a first valve connected with the first oil outlet are controlled to be opened, and the first oil pumping device is controlled to inject oil into the first corrugated pipe, so that the first corrugated pipe stretches, and the inclination angle of the submersible pump shaft reaches a preset inclination angle value range; when the inclination angle of the submersible pump shaft is larger than the maximum value of the preset inclination angle value range, the traction rope is controlled to extend by controlling the voltage of the motor to be reduced, so that the baffle drives the second corrugated pipe to extend; simultaneously, the first oil outlet and the first valve are controlled to be opened, and the first oil pumping device is controlled to drain oil from the first corrugated pipe, so that the first corrugated pipe is compressed, and the inclination angle of the submersible pump shaft reaches a preset inclination angle value range; according to the fault simulation device provided by the application, the working states of the first oil outlet, the first valve and the first oil pumping device and the motor voltage are controlled, and the first corrugated pipe and the second corrugated pipe are controlled to be compressed or stretched, so that the inclination angle of the submersible pump shaft is changed, the submersible pump chamber sweeping fault under different inclination angles of the submersible pump shaft can be simulated, and meanwhile, the severity of the submersible pump chamber sweeping fault under different inclination angles of the submersible pump shaft can be estimated by collecting the operation data of the submersible pump under different inclination angles of the submersible pump shaft.
Drawings
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings, in which:
FIG. 1 is a schematic diagram of a device for simulating a fault of a submersible pump of a transformer;
FIG. 2 is a plan view of a device for simulating the fault of a submersible pump of a transformer;
FIG. 3 is a schematic view of a connection structure between a support arm and a connector according to the present application;
FIG. 4 is a schematic diagram of the principle of calculating the inclination angle of the submersible pump shaft;
FIG. 5 is a flow chart of a method for evaluating a fault of a pump of a transformer submersible pump;
Description of the specification reference numerals: 1. a submersible pump housing; 2. a submersible pump; 3. a submersible pump stator; 4. a rotor; 5. an impeller; 6. a submersible pump shaft; 7. stator windings of the submersible pump; 8. an oil inlet of the oil pump; 9. an oil outlet of the oil pump; 10. an oil tank; 11. an oil filtering device; 12. a connecting piece; 13. a bearing; 14. a first bellows; 141. a first oil outlet; 142. a first valve; 143. a first oil pumping device; 15. a second bellows; 151. a motor; 152. a baffle; 153. a traction rope; 154. a second oil outlet; 155. a second valve; 156. a second oil pumping device; 16. an inclination angle measurement module; 161. a first measurement module; 1611. a first ultraviolet emitter; 1612. a first ultraviolet receiver; 162. a second measurement module; 1621. a second ultraviolet emitter; 1622. a second ultraviolet receiver; 17. operating a data acquisition module; 171. a gas monitoring module; 172. an ultrasonic signal detection module; 173. a vibration signal detection module; 174. a winding three-phase current detection module; 18. an upper computer; 19. a first support arm; 20. a second support arm; 21. a first oil pressure sensor; 22. and a second oil pressure sensor.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the invention and practice it.
Example 1
The transformer submersible pump chamber-sweeping fault simulation device provided by the embodiment of the application is arranged on a transformer submersible pump, and as shown in fig. 1, the transformer submersible pump comprises a submersible pump shell 1, a submersible pump 2, a submersible pump stator 3, a rotor 4, an impeller 5, a submersible pump shaft 6, a submersible pump stator winding 7, an oil pump oil inlet 8, an oil pump oil outlet 9, an oil tank 10 and an oil filtering device 11; the submersible pump stator 3, the rotor 4 and the impeller 5 are concentrically connected through the submersible pump shaft 6, the submersible pump shaft 6 is connected with the submersible pump stator 3 through a bearing, the submersible pump stator 3 is reliably fixed on the inner wall of the submersible pump shell 1, the rotor 4 and the impeller 5 are reliably fixed on the submersible pump shaft 6, the upper side of the oil tank 10 is connected with the oil outlet 9 of the oil pump, the lower side of the oil tank 10 is connected with the oil inlet 8 of the oil pump, and the oil filtering device 11 is connected with the oil tank 10 and is used for filtering dissolved gas in oil generated in the working process.
As shown in fig. 1 and 2, the device for simulating the fault of the oil-submerged pump of the transformer in the application specifically comprises: the device comprises a connecting piece 12, a bearing 13, a first corrugated pipe 14, a first oil outlet 141, a first valve 142, a first oil pumping device 143, a second corrugated pipe 15, a motor 151, a baffle 152, an inclination angle measuring module 16, an operation data acquisition module 17 and an upper computer 18;
The connecting piece 12 is arranged on the submersible pump shaft 6 between the rotor 4 and the impeller 5 in parallel through a bearing 13, the inner ring of the bearing 13 is fixedly connected with the submersible pump shaft 6, and the outer ring of the bearing 13 is fixedly connected with the connecting piece 12;
specifically, balls are arranged between the inner ring and the outer ring of the bearing 13, and the inner ring of the ball is reliably fixed with the submersible pump shaft and rotates along with the submersible pump shaft.
One end of the first corrugated pipe 14 is in sealing connection with the side surface of the connecting piece 12, the other end of the first corrugated pipe is in sealing connection with the inner wall of the oil-submerged pump shell 1, a first oil outlet 141 is arranged on the pipe wall of the first corrugated pipe, the first oil outlet 141 is connected with a first valve 142, and the first valve 142 is connected with a first oil pumping device 143;
The second corrugated pipe 15 and the first corrugated pipe 14 are symmetrically arranged about the submersible pump shaft 6, one end of the second corrugated pipe is in sealing connection with the side surface of the connecting piece 12, the other end of the second corrugated pipe is in sealing connection with the inner wall of the submersible pump shell 1, a motor 151 is arranged on one side, close to the inner wall of the submersible pump shell 1, of the inside of the second corrugated pipe, a baffle 152 is vertically clamped on one side, close to the connecting piece 12, of the inside of the second corrugated pipe, and the baffle 152 is connected with the motor 151 through a traction rope 153;
the inclination angle measurement module 16 is used for collecting current inclination data of the submersible pump shaft;
The operation data acquisition module 17 is used for acquiring operation data of the submersible pump when the current inclination angle of the submersible pump shaft is within a preset inclination angle value range;
For example, when it is required to simulate a submersible pump shaft tilting angle of 5 ° of a submersible pump bore-sweeping fault, the preset tilting angle range may be 。
The host computer 18 specifically includes:
a data processing module, comprising:
The inclination angle acquisition sub-module is in communication connection with the inclination angle measurement module 16 and is used for acquiring the current inclination angle of the submersible pump shaft based on the current inclination data of the submersible pump shaft;
the fault state evaluation sub-module is in communication connection with the operation data acquisition module 17 and is used for evaluating the severity of the sweeping fault of the submersible pump shaft under the current inclination angle based on the operation data of the submersible pump;
The control module is in communication connection with the first valve 142, the first oil pumping device 143, the first oil outlet 141 and the motor 151, and is used for controlling the voltage of the motor 151 to be increased when the current inclination angle of the submersible pump shaft is smaller than the minimum value of the preset inclination angle range, so that the traction rope 153 is contracted, and the baffle 152 drives the second corrugated pipe 15 to be contracted under the tensile force of the traction rope 153; simultaneously controlling the first valve 142 and the first oil outlet 141 to be opened, and controlling the first oil pumping device 143 to inject oil into the first corrugated pipe 14, so that the first corrugated pipe 14 stretches until the current inclination angle of the submersible pump shaft is within the preset inclination angle value range; when the current inclination angle of the submersible pump shaft is larger than the maximum value of the preset inclination angle value range, the voltage of the control motor 151 is reduced, so that the traction rope 153 stretches, and the baffle 152 drives the second corrugated pipe 15 to stretch; simultaneously, the first valve 142 and the first oil outlet 141 are controlled to be opened, and the first oil pumping device 143 is controlled to drain oil from the first corrugated pipe 14, so that the first corrugated pipe 14 is contracted until the current inclination angle of the submersible pump shaft is within the range of the preset inclination angle value, so as to simulate the failure of the submersible pump in the case of the current inclination angle of the submersible pump shaft.
Specifically, the first corrugated pipe and the second corrugated pipe are used for compressing the connecting piece, the first corrugated pipe and the second corrugated pipe are controlled to compress or stretch by changing the working states of the first oil outlet, the first valve and the first oil pumping device and the motor voltage, and the inclined angle of the submersible pump shaft reaches the preset inclined angle value range by the first corrugated pipe and the second corrugated pipe for compressing the connecting piece, so that the submersible pump chamber sweeping faults of the submersible pump shaft under different inclined angles can be simulated, and a hardware facility foundation is provided for researching the correlation between the severity of the chamber sweeping faults and various operation indexes of the submersible pump.
Optionally, as shown in fig. 2, in some embodiments of the application, the device further comprises a first support arm 19 and a second support arm 20;
The space phase difference between the first support arm 19 and the first corrugated pipe 14 relative to the submersible pump shaft 6 is 90 o, one end of the first support arm is connected with the side surface of the connecting piece 12 through a mortise and tenon joint, and the other end of the first support arm is fixedly connected with the inner wall of the submersible pump shell 1 and is used for fixing the connecting piece 12 and preventing the connecting piece 12 from sliding along the vertical direction of the submersible pump shaft;
The second support arm 20 and the first support arm 19 are symmetrically arranged about the submersible pump shaft 6, one end of the second support arm is connected with the side surface of the connecting piece 12 through a mortise and tenon joint, and the other end of the second support arm is fixedly connected with the inner wall of the submersible pump shell 1 and used for fixing the connecting piece 12 and preventing the connecting piece 12 from sliding along the vertical direction of the submersible pump shaft.
Specifically, as shown in fig. 3, the connection between one end of the support arm and the side surface of the connecting piece through the mortise and tenon means: an arc groove is formed in two side surfaces of the connecting piece, which are connected with the supporting arm, one end, connected with the connecting piece, of the supporting arm is clamped in the arc groove, and when the connecting piece drives the submersible pump shaft to incline under the extrusion of the first corrugated pipe and the second corrugated pipe, one end, connected with the connecting piece, of the supporting arm slides in the arc groove.
Optionally, as shown in fig. 2, the apparatus may further include a first oil pressure sensor 21 and a second oil pressure sensor 22, wherein the first oil pressure sensor 21 is disposed inside the first bellows 14, and the second oil pressure sensor 22 is disposed inside the second oil pressure sensor 15 for monitoring the internal oil pressures of the first bellows and the second bellows.
Alternatively, in some embodiments of the present application, the inclination angle measurement module 16 may be an inclination sensor, where the inclination sensor is disposed on the submersible pump shaft to measure the inclination angle of the submersible pump shaft, but for a rapidly changing inclination angle, the inclination sensor may not be able to track in real time, and there is a certain dynamic response limitation, which may cause a delay or error in the measurement result, and in addition, the inclination sensor needs to be calibrated and maintained regularly, which requires professional equipment and technical support, increasing the use cost and time cost, so that, as preferred, the embodiment of the present application uses an ultraviolet transmitter and receiver to measure the inclination angle of the submersible pump shaft;
Specifically, in some embodiments of the present application, the inclination angle measurement module 16 specifically includes:
the first measurement module 161 is disposed right above the first bellows 14 on the inner wall of the submersible pump housing 1, and includes:
A first ultraviolet transmitter 1611 for transmitting a first ultraviolet signal to the submersible pump shaft 6;
The first ultraviolet receiver 1612 is arranged right above the first ultraviolet transmitter 1611 on the inner wall of the oil-submerged pump housing 1, and is used for receiving the first ultraviolet signal and acquiring a receiving position of the first ultraviolet signal, and transmitting the receiving position of the first ultraviolet signal to the inclination angle acquisition sub-module;
The second measurement module 162, which is symmetrically disposed with respect to the submersible pump shaft 6 with the first measurement module 161, includes:
A second ultraviolet transmitter 1621 for transmitting a second ultraviolet signal to the submersible pump shaft 6;
the second ultraviolet receiver 1622 is disposed under the second ultraviolet transmitter 1621 on the inner wall of the oil-submerged pump housing 1, and is configured to receive the second ultraviolet signal and obtain a receiving position of the second ultraviolet signal, and transmit the receiving position of the second ultraviolet signal to the inclination angle obtaining sub-module.
Based on the inclination angle measurement module, the inclination angle acquisition sub-module calculates the current inclination angle of the submersible pump shaft based on the position of the first ultraviolet emitter, the position of the second ultraviolet emitter, the receiving position of the first ultraviolet signal, the receiving position of the second ultraviolet signal, the vertical distance between the first ultraviolet emitter and the submersible pump stator, the vertical distance between the second ultraviolet emitter and the submersible pump stator, and the vertical distance between the first ultraviolet emitter and the submersible pump shaft when the inclination angle of the submersible pump shaft is 0;
specifically, the calculation formula of the current inclination angle of the submersible pump shaft is as follows:
，
wherein, Representing the current inclination angle of the submersible pump shaft; /(I)Representing a distance between the first ultraviolet transmitter and the first ultraviolet signal receiving location; /(I)Representing a distance between the second ultraviolet transmitter and the second ultraviolet signal receiving location; /(I)Representing a vertical distance between the first ultraviolet emitter and the submersible pump shaft when the submersible pump shaft is inclined at an angle of 0; /(I)Representing a vertical distance between the first ultraviolet emitter and the submersible pump stator; /(I)Representing the vertical distance between the second ultraviolet emitter and the stator of the submersible pump.
Specifically, as shown in fig. 4, the principle of detecting the inclination angle of the submersible pump shaft by using the ultraviolet transmitter and the receiver is as follows: when the submersible pump shaft is inclined by 0 o, the ultraviolet rays emitted by the first ultraviolet emitter and the second ultraviolet emitter are perpendicular to the submersible pump shaft, and the ultraviolet reflection light returns in the original path, and the first ultraviolet receiver and the second ultraviolet receiver are adjacent to the positions of the first ultraviolet emitter and the second ultraviolet emitter, so that the distance m between the position of receiving the first ultraviolet ray and the position of the first ultraviolet emitter is 0, and the distance u between the position of receiving the second ultraviolet ray and the position of the second ultraviolet emitter is 0; when the inclination angle of the submersible pump shaft is o When the incident angle and the reflection angle of the first ultraviolet ray and the second ultraviolet ray and the submersible pump shaft are/>, the incident angle and the reflection angle of the first ultraviolet ray and the second ultraviolet ray and the submersible pump shaft are o Assuming that the vertical distance between the first ultraviolet emitter and the second ultraviolet emitter and the submersible pump shaft is l, the vertical distance between the first ultraviolet emitter and the submersible pump stator is h, and the vertical distance between the second ultraviolet emitter and the submersible pump stator is g when the submersible pump shaft is not inclined, the vertical distance between the first ultraviolet emitter and the submersible pump stator is g o When the distance between the first ultraviolet emitter and the submersible pump shaft is/>The distance between the second ultraviolet emitter and the submersible pump shaft is/>Thus,/>I.e./>，/>。
Optionally, in some embodiments of the present application, the operation data of the submersible pump collected by the operation data collection module may be one or more of a content of dissolved gas in oil in a submersible pump tank under a current inclination angle of a submersible pump shaft, an ultrasonic signal of the submersible pump, a vibration signal of the submersible pump, and a three-phase current of a stator of the submersible pump, that is, the operation data collection module may be one or more of a gas monitoring module, an ultrasonic signal detection module, a vibration signal detection module, and a winding three-phase current detection module;
Further, when the collected operation data of the submersible pump is the content of dissolved gas in oil in the oil tank of the submersible pump under the current inclination angle of the submersible pump shaft, the fault state evaluation submodule calculates the state quantity of the content of the dissolved gas in the oil under the current inclination angle of the submersible pump shaft based on the content of the dissolved gas in the oil, and the larger the state quantity of the content of the dissolved gas in the oil is, the more serious the sweeping fault is indicated; when the collected operation data of the submersible pump is an ultrasonic signal of the submersible pump under the current inclination angle of the submersible pump shaft, the fault state evaluation submodule calculates an ultrasonic signal state quantity under the current inclination angle of the submersible pump shaft based on the ultrasonic signal, and the larger the ultrasonic signal state quantity is, the more serious the sweeping fault is indicated; when the collected operation data of the submersible pump is a vibration signal of the submersible pump under the current inclination angle of the submersible pump shaft, the fault state evaluation submodule calculates a vibration signal state quantity under the current inclination angle of the submersible pump shaft based on the vibration signal, and the larger the vibration signal state quantity is, the more serious the sweeping fault is; when the collected submersible pump operation data is the three-phase current of the submersible pump stator under the current inclination angle of the submersible pump shaft, the fault state evaluation submodule calculates the three-phase current state quantity of the submersible pump stator based on the three-phase current of the submersible pump stator, and the larger the three-phase current state quantity of the submersible pump stator is, the more serious the sweeping fault is indicated.
Preferably, in order to make the scan fault severity assessment result more accurate, in the embodiment of the present application, the operation data acquisition module 17 includes a gas monitoring module 171, an ultrasonic signal detection module 172, a vibration signal detection module 173, and a winding three-phase current detection module 174;
The gas monitoring module 171 is used for monitoring the content of dissolved gas in oil in the oil tank of the submersible pump under the current inclination angle of the submersible pump shaft, and transmitting the content of the dissolved gas in the oil to the fault state evaluation sub-module; wherein the dissolved gas content in the oil comprises hydrogen concentration, acetylene concentration and total hydrocarbon concentration;
the ultrasonic signal detection module 172 is used for monitoring an ultrasonic signal of the submersible pump under the current inclination angle of the submersible pump shaft and transmitting the ultrasonic signal to the fault state evaluation sub-module;
The vibration signal detection module 173 is configured to monitor a vibration signal of the submersible pump at a current inclination angle of the submersible pump shaft, and transmit the vibration signal to the fault state evaluation sub-module;
The winding three-phase current detection module 174 is used for detecting the three-phase current of the submersible pump stator under the current inclination angle of the submersible pump shaft, and transmitting the three-phase current of the submersible pump stator to the fault state evaluation sub-module.
Specifically, in the present embodiment, the gas monitoring module 171 is connected to the oil tank 10 through a pipeline, and the dissolved gas content in the oil tank can be monitored by taking a small amount of oil from the oil tank 10 as a sample to be tested and inputting the oil to the gas monitoring module 171; the ultrasonic signal detection module 172 and the vibration signal detection module 173 are arranged on the outer wall of the oil-submerged pump shell 1, so that ultrasonic signals and vibration signals of the oil-submerged pump can be monitored; in addition, when the submersible pump works, the submersible pump stator 3 can be led out of the submersible pump shell 1 through a lead, so that the three-phase current of the stator can be detected by connecting the winding three-phase current detection module 174 with the lead of the submersible pump stator 3 extending out of the submersible pump shell 1.
Based on the operation data acquisition module, the fault state evaluation submodule comprises:
The oil pump comprises an oil pump shaft and an oil pump shaft, wherein the oil pump shaft is provided with an oil pump, a dissolved gas content state quantity calculating unit in oil, and an oil pump, wherein the oil pump shaft is provided with an oil pump, and the oil pump shaft is provided with an oil pump, a water pump and a water pump;
Specifically, in the content of dissolved gas in transformer oil, acetylene is generated at a temperature above 1000 ℃ or in an environment where high-energy discharge (i.e. very serious fault) occurs, and hydrogen is generated at a temperature above 300 ℃ or in an environment where low-energy discharge occurs, so that the calculation formula of the state quantity of the content of dissolved gas in oil is as follows:
，
wherein, Indicating the state quantity of the dissolved gas in the oil; /(I)Represents a hydrogen concentration coefficient, when the hydrogen concentration is less than 30,/>When the hydrogen concentration is 30 or more and 150 or less,/>When the hydrogen concentration is 150 or more,；/>Represents the acetylene concentration coefficient, when the acetylene concentration is less than 1,/>When the acetylene concentration is 1 or more and less than 5,/>When the acetylene concentration is 5 or more,/>；/>Representing the total hydrocarbon concentration coefficient, when the total hydrocarbon concentration is less than 20,When the total hydrocarbon concentration is 20 or more and less than 150,/>When the total hydrocarbon concentration is 150 or more,/>。
The ultrasonic signal state quantity calculating unit is used for calculating the difference value between the ultrasonic signal and the standard ultrasonic signal, carrying out Fourier transform on the difference value to obtain a target signal, and calculating the ultrasonic signal state quantity of the submersible pump shaft under the current inclination angle based on a low-frequency component and a high-frequency component in the target signal; the standard ultrasonic signal is an ultrasonic signal of the submersible pump when the inclination angle of the submersible pump shaft is 0;
specifically, the calculation formula of the target signal is:
，
wherein, Representing the target signal,/>Representing ultrasound signals,/>Representing standard ultrasound signals,/>Representing imaginary number,/>Represents the angular frequency of the argument;
The calculation formula of the low-frequency component in the target signal is as follows:
，
wherein, Representing the target Signal/>Low frequency components of (a);
the calculation formula of the high-frequency component in the target signal is as follows:
，
wherein, Representing the target Signal/>High frequency components of (a);
The calculation formula of the ultrasonic signal state quantity is as follows:
,
wherein, Representing the ultrasonic signal state quantity.
The vibration signal state quantity calculating unit is used for decomposing the vibration signal into an N-order harmonic signal and a direct current component signal by adopting Fourier series conversion, calculating single-period speed root-mean-square value of each harmonic signal respectively, calculating the whole speed root-mean-square value of the N-order harmonic signal based on the single-period speed root-mean-square value of each harmonic signal and the speed root-mean-square value of the direct current component signal, and calculating the vibration signal state quantity of the submersible pump shaft under the current inclination angle based on the whole speed root-mean-square value of the N-order harmonic signal;
specifically, the formula for decomposing the vibration signal into an N-th harmonic signal by fourier series conversion is:
，
，
，
，
，
wherein, Representing vibration signal,/>Representing the period of the vibration signal,/>Representing harmonic order,/>，Representing the/>, after Fourier series conversion of the vibration signalCosine component coefficient of subharmonic signal,/>Representing the/>, after Fourier series conversion of the vibration signalSinusoidal component coefficient of subharmonic signal,/>Representing a DC component signal after Fourier series conversion of the vibration signal,/>Represents the/>Harmonic phase of subharmonic signal,/>An angular frequency representing the 1 st harmonic signal;
the calculation formula of the root mean square value of the single period speed of each subharmonic signal is as follows:
，
wherein, Represents the/>A single period speed root mean square value of the subharmonic signal;
the calculation formula of the root mean square value of the overall speed of the N harmonic signals is as follows:
，
wherein, Root mean square value of overall velocity representing an N-th harmonic signal,/>Representing the root mean square value of the velocity of a DC component signal,/>；
The calculation formula of the vibration signal state quantity is as follows:
，
wherein, Representing the vibration signal state quantity.
The submersible pump stator three-phase current state quantity calculating unit is used for respectively decomposing the submersible pump stator three-phase current into M harmonic signals by adopting Fourier series conversion, respectively calculating three-phase current distortion rate based on the M harmonic signals corresponding to the three-phase current, and calculating the submersible pump stator three-phase current state quantity under the current inclination angle of the submersible pump shaft based on the three-phase current distortion rate;
Specifically, the calculation formula of the three-phase current distortion rate is:
，
，
，
wherein, Represents the A phase current distortion rate,/>Represents the/>, of the phase A currentSubharmonic amplitude,/>，Representing the 1 st harmonic amplitude of the A-phase current,/>Represents B-phase current distortion rate,/>Represents the/>, of the B-phase currentSubharmonic amplitude,/>Representing the 1 st harmonic amplitude of the B-phase current,/>Represents C phase current distortion rate,/>Represents the/>, of the C-phase currentSubharmonic amplitude,/>Representing the 1 st harmonic amplitude of the C-phase current;
the calculation formula of the three-phase current state quantity of the submersible pump stator is as follows:
，
wherein, And the three-phase current state quantity of the submersible pump stator is represented.
The device comprises a scan bore fault severity assessment unit, a scan bore fault severity assessment unit and a scan bore fault severity unit, wherein the scan bore fault severity unit is used for calculating an operation state quantity of an oil-submerged pump based on a state quantity of dissolved gas content in oil, an ultrasonic signal state quantity, a vibration signal state quantity and a three-phase current state quantity of a stator of the oil-submerged pump, and assessing the scan bore fault severity of the oil-submerged pump under the current inclination angle of the oil-submerged pump based on the operation state quantity of the oil-submerged pump;
specifically, the calculation formula of the operation state quantity of the oil-submerged pump is as follows:
，
wherein, Representing the running state quantity of the submersible pump,/>Representing the state quantity of dissolved gas in oil,/>Representing ultrasonic signal state quantity,/>Representing the state quantity of vibration signal,/>Representing three-phase current state quantity of the submersible pump stator;
The evaluation of the severity of the sweeping fault of the submersible pump shaft under the current inclination angle based on the running state quantity of the submersible pump comprises the following steps:
If it is Judging that the submersible pump has no sweeping fault, if/>Judging that the oil-submerged pump has a slight sweeping fault, if/>Judging that the oil-submerged pump has moderate sweeping fault, if/>And judging that the submersible pump has serious bore sweeping faults.
Specifically, because the oil-submerged pump generates vibration signals and ultrasonic signals directly when the oil-submerged pump breaks down, the weights of the ultrasonic signal state quantity and the vibration signal state quantity are higher when the oil-submerged pump running state quantity is calculated, and dissolved gas in oil is indirectly caused by the occurrence of friction heating of the oil-submerged pump, and a diffusion process exists, so that the oil-submerged pump running state quantity has certain hysteresis, and the weight of the dissolved gas content state quantity in oil is lower when the oil-submerged pump running state quantity is calculated.
Optionally, as shown in fig. 2, the device for simulating the fault of the oil-submerged pump sweeping of the transformer further comprises a second oil outlet 154, a second valve 155 and a second oil pumping device 156;
The second oil outlet 154 is arranged on the wall of the second corrugated pipe 15, the second oil outlet 154 is connected with a second valve 155, the second valve 155 is connected with a second oil pumping device 156, and the second oil outlet 154, the second valve 155 and the second oil pumping device 156 are all in communication connection with the control module;
The control module is also used for when continuous The obtained relative standard deviation value of the inclination angle of the submersible pump shaft is larger than a preset threshold value, the first valve and the first oil outlet are controlled to be opened, and the first oil pumping device is controlled to inject oil into the first corrugated pipe, so that the first corrugated pipe is stretched; simultaneously controlling the second valve and the second oil outlet to be opened, and controlling the second oil pumping device to inject oil into the second corrugated pipe, so that the second corrugated pipe stretches until the second corrugated pipe is continuous/>The acquired relative standard deviation value of the inclination angle of the submersible pump shaft is smaller than or equal to a preset threshold value;
Wherein, continuously The calculation formula of the relative standard deviation value of the inclination angle of the submersible pump shaft is as follows:
，
wherein, Representing the succession/>The relative standard deviation value of the inclination angle of the submersible pump shaft obtained for the second time,/>Representing the acquisition times of the inclination angle of the submersible pump shaftRepresents the/>The next acquired inclination angle of the submersible pump shaft,/>Representation/>The average value of the inclination angles of the submersible pump shafts is acquired next time.
Specifically, in order to avoid shaking of the submersible pump shaft caused by the fact that the first corrugated pipe and the second corrugated pipe are not tightly pressed by the connecting piece in the fault simulation process, fault simulation precision is improved, the inclination angle of the submersible pump shaft can be measured continuously for multiple times, when the relative standard deviation value of the inclination angle of the submersible pump shaft obtained continuously for multiple times is larger than a preset threshold value, the shaking amplitude of the submersible pump shaft at the moment is larger in the rotation process, and oil is injected into the first corrugated pipe and the second corrugated pipe simultaneously, so that the first corrugated pipe and the second corrugated pipe are stretched simultaneously, and the connecting piece is tightly pressed, so that the submersible pump shaft is further tightly pressed and fixed, and the shaking amplitude of the submersible pump shaft is reduced.
In some embodiments of the application, the first oil outlet, the first valve, the first oil pumping device, the second oil outlet, the second valve, the second oil pumping device, the motor, the first oil pressure sensor and the second oil pressure sensor can communicate with the upper computer in a wireless mode; in other embodiments of the present application, the first oil pressure sensor, the first valve, the first oil pumping device and the first oil outlet may be led out of the oil-submerged pump through a signal transmission line to connect with the host computer, and the second oil pressure sensor, the second valve, the second oil pumping device, the second oil outlet and the motor may also be led out of the oil-submerged pump through a signal transmission line to connect with the host computer, as shown by the dashed line in fig. 2, which is the signal transmission line.
Example 2
Based on the above-mentioned device for simulating a fault of a pump-submerged pump in a pump-submerged pump of a transformer provided in embodiment 1, this embodiment further provides a method for evaluating a fault of a pump-submerged pump in a pump-submerged pump of a transformer, as shown in fig. 5, which specifically includes:
s10: starting the submersible pump to enable the submersible pump to reach a rated rotation speed, collecting current inclination data of the submersible pump shaft, and acquiring the current inclination angle of the submersible pump shaft based on the current inclination data of the submersible pump shaft;
S20: when the current inclination angle of the submersible pump shaft is within a preset inclination angle value range, collecting submersible pump operation data, and evaluating the severity of the sweeping fault of the submersible pump shaft under the current inclination angle based on the submersible pump operation data;
s30: when the current inclination angle of the submersible pump shaft is smaller than the minimum value of the preset inclination angle value range, controlling the voltage of the motor to be increased, thereby controlling the traction rope to shrink, and enabling the baffle to drive the second corrugated pipe to shrink under the action of the tension of the traction rope; simultaneously controlling the first valve and the first oil outlet to be opened, and controlling the first oil pumping device to inject oil into the first corrugated pipe, so that the first corrugated pipe stretches until the current inclination angle of the submersible pump shaft is within the preset inclination angle value range;
S40: when the current inclination angle of the submersible pump shaft is larger than the maximum value of the preset inclination angle value range, controlling the voltage of the motor to be reduced, and controlling the traction rope to extend, so that the baffle drives the second corrugated pipe to extend; simultaneously, the first valve and the first oil outlet are controlled to be opened, and the first oil pumping device is controlled to drain oil from the first corrugated pipe, so that the first corrugated pipe is contracted until the current inclination angle of the submersible pump shaft is within the range of the preset inclination angle.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations and modifications of the present invention will be apparent to those of ordinary skill in the art in light of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (14)
1. The utility model provides a transformer oil-submerged pump sweeps thorax fault simulation device which characterized in that includes:
The connecting piece is arranged on the submersible pump shaft between the impeller and the rotor in parallel through a bearing, the inner ring of the bearing is fixedly connected with the submersible pump shaft, and the outer ring of the bearing is fixedly connected with the connecting piece;
One end of the first corrugated pipe is in sealing connection with the side surface of the connecting piece, the other end of the first corrugated pipe is in sealing connection with the inner wall of the oil-submerged pump shell, a first oil outlet is arranged on the pipe wall of the first corrugated pipe, the first oil outlet is connected with a first valve, and the first valve is connected with a first oil pumping device;
The second corrugated pipe is symmetrically arranged with the first corrugated pipe about the submersible pump shaft, one end of the second corrugated pipe is in sealing connection with the side surface of the connecting piece, the other end of the second corrugated pipe is in sealing connection with the inner wall of the submersible pump shell, a motor is arranged on one side, close to the inner wall of the submersible pump shell, of the second corrugated pipe, a baffle is vertically clamped on one side, close to the connecting piece, of the second corrugated pipe, and the baffle is connected with the motor through a traction rope;
The inclination angle measuring module is used for collecting current inclination data of the submersible pump shaft;
the operation data acquisition module is used for acquiring operation data of the submersible pump when the current inclination angle of the submersible pump shaft is within the preset inclination angle value range;
the upper computer, it specifically includes:
a data processing module, comprising:
The inclination angle acquisition sub-module is in communication connection with the inclination angle measurement module and is used for acquiring the current inclination angle of the submersible pump shaft based on the current inclination data of the submersible pump shaft;
The fault state evaluation sub-module is in communication connection with the operation data acquisition module and is used for evaluating the severity of the sweeping fault of the submersible pump shaft under the current inclination angle based on the operation data of the submersible pump;
The control module is in communication connection with the first valve, the first oil pumping device, the first oil outlet and the motor, and is used for controlling the voltage of the motor to be increased when the current inclination angle of the submersible pump shaft is smaller than the minimum value of the preset inclination angle range, so that the traction rope is contracted, and the baffle drives the second corrugated pipe to be contracted under the action of the tension of the traction rope; simultaneously controlling the first valve and the first oil outlet to be opened, and controlling the first oil pumping device to inject oil into the first corrugated pipe, so that the first corrugated pipe stretches until the current inclination angle of the submersible pump shaft is within a preset inclination angle value range; when the current inclination angle of the submersible pump shaft is larger than the maximum value of the preset inclination angle value range, controlling the motor voltage to be reduced, so that the traction rope stretches, and the baffle drives the second corrugated pipe to stretch; simultaneously controlling the first valve and the first oil outlet to be opened, and controlling the first oil pumping device to drain oil from the first corrugated pipe, so that the first corrugated pipe is contracted until the current inclination angle of the submersible pump shaft is within a preset inclination angle value range, so as to simulate the submersible pump chamber sweeping fault under the current inclination angle of the submersible pump shaft.
2. The transformer submersible pump bore-sweeping fault simulation device of claim 1, further comprising:
the first support arm is arranged with the first corrugated pipe in a 90 o -degree phase difference relative to the space of the submersible pump shaft, one end of the first support arm is connected with the side surface of the connecting piece through a grooved mortise and tenon, and the other end of the first support arm is fixedly connected with the inner wall of the submersible pump shell and used for fixing the connecting piece and preventing the connecting piece from sliding along the vertical direction of the submersible pump shaft;
The second support arm is symmetrically arranged on the first support arm relative to the submersible pump shaft, one end of the second support arm is connected with the side surface of the connecting piece through a mortise and tenon joint, and the other end of the second support arm is fixedly connected with the inner wall of the submersible pump shell and used for fixing the connecting piece and preventing the connecting piece from sliding along the vertical direction of the submersible pump shaft.
3. The transformer oil-submerged pump bore-sweeping fault simulation device of claim 1, wherein the inclination angle measurement module comprises:
The first measurement module, set up directly over the first bellows of oil-submerged pump shell inner wall, it includes:
a first ultraviolet transmitter for transmitting a first ultraviolet signal to the submersible pump shaft;
the first ultraviolet receiver is arranged right above the first ultraviolet transmitter on the inner wall of the oil-submerged pump shell and is used for receiving the first ultraviolet signal and acquiring the receiving position of the first ultraviolet signal, and transmitting the receiving position of the first ultraviolet signal to the inclination angle acquisition sub-module;
The second measuring module and the first measuring module are symmetrically arranged about the submersible pump shaft and comprise;
a second ultraviolet transmitter for transmitting a second ultraviolet signal to the submersible pump shaft;
The second ultraviolet receiver is arranged right below the second ultraviolet transmitter on the inner wall of the oil-submerged pump shell and is used for receiving the second ultraviolet signal and acquiring the receiving position of the second ultraviolet signal and transmitting the receiving position of the second ultraviolet signal to the inclination angle acquisition sub-module.
4. The transformer submersible pump bore-sweeping fault simulation device of claim 3, wherein the inclination angle acquisition sub-module calculates the current inclination angle of the submersible pump shaft based on the position of the first ultraviolet transmitter, the position of the second ultraviolet transmitter, the receiving position of the first ultraviolet signal, the receiving position of the second ultraviolet signal, the vertical distance between the first ultraviolet transmitter and the submersible pump stator, the vertical distance between the second ultraviolet transmitter and the submersible pump stator, and the vertical distance between the first ultraviolet transmitter and the submersible pump shaft when the inclination angle of the submersible pump shaft is 0;
The calculation formula of the current inclination angle of the submersible pump shaft is as follows:
，
wherein, Representing the current inclination angle of the submersible pump shaft; /(I)Representing a distance between the first ultraviolet transmitter and the first ultraviolet signal receiving location; /(I)Representing a distance between the second ultraviolet transmitter and the second ultraviolet signal receiving location; /(I)Representing a vertical distance between the first ultraviolet emitter and the submersible pump shaft when the submersible pump shaft is inclined at an angle of 0; /(I)Representing a vertical distance between the first ultraviolet emitter and the submersible pump stator; /(I)Representing the vertical distance between the second ultraviolet emitter and the stator of the submersible pump.
5. The transformer oil-submerged pump bore-sweeping fault simulation device of claim 1, wherein the operational data acquisition module comprises:
The gas monitoring module is used for monitoring the content of dissolved gas in oil in an oil tank of the submersible pump under the current inclination angle of the submersible pump shaft and transmitting the content of the dissolved gas in the oil to the fault state evaluation sub-module; wherein the dissolved gas content in the oil comprises hydrogen concentration, acetylene concentration and total hydrocarbon concentration;
the ultrasonic signal detection module is used for monitoring an ultrasonic signal of the submersible pump under the current inclination angle of the submersible pump shaft and transmitting the ultrasonic signal to the fault state evaluation sub-module;
The vibration signal detection module is used for monitoring a vibration signal of the submersible pump at the current inclination angle of the submersible pump shaft and transmitting the vibration signal to the fault state evaluation sub-module;
And the winding three-phase current detection module is used for detecting the three-phase current of the submersible pump stator under the current inclination angle of the submersible pump shaft and transmitting the three-phase current of the submersible pump stator to the fault state evaluation sub-module.
6. The transformer oil-submerged pump bore-sweeping fault simulation device of claim 5, wherein the fault state evaluation submodule comprises:
The oil pump comprises an oil dissolved gas content state quantity calculating unit, a water pump and a water pump, wherein the oil dissolved gas content state quantity calculating unit is used for calculating the oil dissolved gas content state quantity under the current inclination angle of the oil pump shaft based on the content of the dissolved gas in the oil;
The ultrasonic signal state quantity calculating unit is used for calculating the difference value between the ultrasonic signal and the standard ultrasonic signal, carrying out Fourier transform on the difference value to obtain a target signal, and calculating the ultrasonic signal state quantity of the submersible pump shaft under the current inclination angle based on a low-frequency component and a high-frequency component in the target signal; the standard ultrasonic signal is an ultrasonic signal of the submersible pump when the inclination angle of the submersible pump shaft is 0;
The vibration signal state quantity calculating unit is used for decomposing the vibration signal into an N-order harmonic signal and a direct current component signal by adopting Fourier series conversion, calculating single-period speed root-mean-square value of each harmonic signal respectively, calculating the integral speed root-mean-square value of the N-order harmonic signal based on the single-period speed root-mean-square value of each harmonic signal and the speed root-mean-square value of the direct current component signal, and calculating the vibration signal state quantity of the submersible pump shaft under the current inclination angle based on the integral speed root-mean-square value of the N-order harmonic signal;
The submersible pump stator three-phase current state quantity calculating unit is used for respectively decomposing the submersible pump stator three-phase current into M harmonic signals by adopting Fourier series conversion, respectively calculating three-phase current distortion rate based on the M harmonic signals corresponding to the three-phase current, and calculating the submersible pump stator three-phase current state quantity under the current inclination angle of the submersible pump shaft based on the three-phase current distortion rate;
The device comprises a scan bore fault severity assessment unit, a scan bore fault severity assessment unit and a scan bore fault severity unit, wherein the scan bore fault severity unit is used for calculating an operation state quantity of an oil-submerged pump based on a state quantity of dissolved gas content in oil, an ultrasonic signal state quantity, a vibration signal state quantity and a three-phase current state quantity of a stator of the oil-submerged pump, and assessing the scan bore fault severity of the oil-submerged pump under the current inclination angle of the oil-submerged pump shaft based on the operation state quantity of the oil-submerged pump.
7. The device for simulating a fault in a pump-down stroke of a transformer according to claim 6, wherein the state quantity of dissolved gas in the oil is calculated by the following formula:
，
wherein, Indicating the state quantity of the dissolved gas in the oil; /(I)Represents the hydrogen concentration coefficient, when the hydrogen concentration is less than 30,When the hydrogen concentration is 30 or more and 150 or less,/>When the hydrogen concentration is 150 or more,/>；/>Represents the acetylene concentration coefficient, when the acetylene concentration is less than 1,/>When the acetylene concentration is 1 or more and less than 5,/>When the acetylene concentration is 5 or more,/>；/>Represents the total hydrocarbon concentration coefficient, when the total hydrocarbon concentration is less than 20,/>When the total hydrocarbon concentration is 20 or more and less than 150,/>When the total hydrocarbon concentration is 150 or more,/>。
8. The device for simulating a fault in a pump-down stroke of a transformer according to claim 6, wherein the calculation formula of the target signal is:
，
wherein, Representing the target signal,/>Representing ultrasound signals,/>Representing standard ultrasound signals,/>Representing imaginary number,/>Represents the angular frequency of the argument;
The calculation formula of the low-frequency component in the target signal is as follows:
，
wherein, Representing the target Signal/>Low frequency components of (a);
the calculation formula of the high-frequency component in the target signal is as follows:
，
wherein, Representing the target Signal/>High frequency components of (a);
The calculation formula of the ultrasonic signal state quantity is as follows:
,
wherein, Representing the ultrasonic signal state quantity.
9. The device for simulating a transformer oil-submerged pump bore-sweeping fault according to claim 6, wherein the formula for decomposing the vibration signal into an N-order harmonic signal by fourier transform is:
，
，
，
，
，
wherein, Representing vibration signal,/>Representing the period of the vibration signal,/>Representing harmonic order,/>，/>Representing the/>, after Fourier series conversion of the vibration signalCosine component coefficient of subharmonic signal,/>Representing the/>, after Fourier series conversion of the vibration signalSinusoidal component coefficient of subharmonic signal,/>Representing a DC component signal after Fourier series conversion of the vibration signal,/>Represents the/>Harmonic phase of subharmonic signal,/>An angular frequency representing the 1 st harmonic signal;
the calculation formula of the root mean square value of the single period speed of each subharmonic signal is as follows:
，
wherein, Represents the/>A single period speed root mean square value of the subharmonic signal;
the calculation formula of the root mean square value of the overall speed of the N harmonic signals is as follows:
，
wherein, Root mean square value of overall velocity representing an N-th harmonic signal,/>Representing the root mean square value of the velocity of a DC component signal,/>；
The calculation formula of the vibration signal state quantity is as follows:
，
wherein, Representing the vibration signal state quantity.
10. The device for simulating a fault in a submersible pump of a transformer according to claim 6, wherein the three-phase current distortion rate is calculated by the following formula:
，
，
，
wherein, Represents the A phase current distortion rate,/>Represents the/>, of the phase A currentSubharmonic amplitude,/>，/>Representing the 1 st harmonic amplitude of the A-phase current,/>Represents B-phase current distortion rate,/>Represents the/>, of the B-phase currentThe amplitude of the subharmonic wave,Representing the 1 st harmonic amplitude of the B-phase current,/>Represents C phase current distortion rate,/>Represents the/>, of the C-phase currentSubharmonic amplitude,/>Representing the 1 st harmonic amplitude of the C-phase current;
the calculation formula of the three-phase current state quantity of the submersible pump stator is as follows:
，
wherein, And the three-phase current state quantity of the submersible pump stator is represented.
11. The device for simulating a fault in a pump-submerged pump-submerged pump operation of claim 6, wherein the calculation formula of the pump-submerged pump operation state quantity is:
，
wherein, Representing the running state quantity of the submersible pump,/>Representing the state quantity of dissolved gas in oil,/>Representing ultrasonic signal state quantity,/>Representing the state quantity of vibration signal,/>Representing three-phase current state quantity of the submersible pump stator;
the evaluation of the severity of the sweeping fault of the submersible pump shaft under the current inclination angle based on the running state quantity of the submersible pump comprises the following steps:
If it is Judging that the submersible pump has no sweeping fault, if/>Judging that the oil-submerged pump has a slight sweeping fault, if/>Judging that the oil-submerged pump has moderate sweeping fault, if/>And judging that the submersible pump has serious bore sweeping faults.
12. The transformer submersible pump bore-sweeping fault simulation device of claim 1, further comprising:
The second oil outlet is arranged on the wall of the second corrugated pipe, the second oil outlet is connected with a second valve, the second valve is connected with a second oil pumping device, and the second oil outlet, the second valve and the second oil pumping device are all in communication connection with the control module.
13. The device for simulating a fault in a pump-down stroke of a transformer of claim 12, wherein the control module is further configured to, when continuouslyThe obtained relative standard deviation value of the inclination angle of the submersible pump shaft is larger than a preset threshold value, the first valve and the first oil outlet are controlled to be opened, and the first oil pumping device is controlled to inject oil into the first corrugated pipe, so that the first corrugated pipe stretches; simultaneously controlling the second valve and the second oil outlet to be opened, and controlling the second oil pumping device to inject oil into the second corrugated pipe, so that the second corrugated pipe stretches until the second corrugated pipe is continuous/>The acquired relative standard deviation value of the inclination angle of the submersible pump shaft is smaller than or equal to a preset threshold value;
Wherein, continuously The calculation formula of the relative standard deviation value of the inclination angle of the submersible pump shaft is as follows:
，
wherein, Representing the succession/>The relative standard deviation value of the inclination angle of the submersible pump shaft obtained for the second time,/>Representing the acquisition times of the inclination angle of the submersible pump shaftRepresents the/>The next acquired inclination angle of the submersible pump shaft,/>Representation/>The average value of the inclination angles of the submersible pump shafts is acquired next time.
14. A method for evaluating a fault of a pump of a transformer submersible pump by a pump-through fault simulation device of a transformer submersible pump according to any one of claims 1 to 13, comprising:
starting the submersible pump to enable the submersible pump to reach a rated rotation speed, collecting current inclination data of the submersible pump shaft, and acquiring the current inclination angle of the submersible pump shaft based on the current inclination data of the submersible pump shaft;
When the current inclination angle of the submersible pump shaft is within a preset inclination angle value range, collecting submersible pump operation data, and evaluating the severity of the sweeping fault of the submersible pump shaft under the current inclination angle based on the submersible pump operation data;
When the current inclination angle of the submersible pump shaft is smaller than the minimum value of the preset inclination angle value range, controlling the voltage of the motor to be increased, thereby controlling the traction rope to shrink, and enabling the baffle to drive the second corrugated pipe to shrink under the action of the tension of the traction rope; simultaneously controlling the first valve and the first oil outlet to be opened, and controlling the first oil pumping device to inject oil into the first corrugated pipe, so that the first corrugated pipe stretches until the current inclination angle of the submersible pump shaft is within the preset inclination angle value range;
When the current inclination angle of the submersible pump shaft is larger than the maximum value of the preset inclination angle value range, controlling the voltage of the motor to be reduced, and controlling the traction rope to extend, so that the baffle drives the second corrugated pipe to extend; simultaneously, the first valve and the first oil outlet are controlled to be opened, and the first oil pumping device is controlled to drain oil from the first corrugated pipe, so that the first corrugated pipe is contracted until the current inclination angle of the submersible pump shaft is within the range of the preset inclination angle.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0968086A (en) * | 1995-08-31 | 1997-03-11 | Nissan Motor Co Ltd | Fuel pump |
| CN105545765A (en) * | 2016-01-15 | 2016-05-04 | 江苏大学 | Performance test device under swing condition of marine pump |
| KR20160070380A (en) * | 2014-12-10 | 2016-06-20 | 인하공업전문대학산학협력단 | Rotating Axis Defect Diagnostics System for Centrifugal Pump |
| CN112096597A (en) * | 2020-09-16 | 2020-12-18 | 中国科学技术大学 | Cryogenic pump with double-valve structure |
| CN215927813U (en) * | 2021-06-17 | 2022-03-01 | 江苏航天水力设备有限公司 | Water pump unit vibration amplitude frequency detection alarm device |
-
2024
- 2024-04-25 CN CN202410507221.1A patent/CN118066126A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0968086A (en) * | 1995-08-31 | 1997-03-11 | Nissan Motor Co Ltd | Fuel pump |
| KR20160070380A (en) * | 2014-12-10 | 2016-06-20 | 인하공업전문대학산학협력단 | Rotating Axis Defect Diagnostics System for Centrifugal Pump |
| CN105545765A (en) * | 2016-01-15 | 2016-05-04 | 江苏大学 | Performance test device under swing condition of marine pump |
| CN112096597A (en) * | 2020-09-16 | 2020-12-18 | 中国科学技术大学 | Cryogenic pump with double-valve structure |
| CN215927813U (en) * | 2021-06-17 | 2022-03-01 | 江苏航天水力设备有限公司 | Water pump unit vibration amplitude frequency detection alarm device |
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