CN117267149A - Online sensing device and evaluation method for state of high-capacity power transformer oil pump - Google Patents
Online sensing device and evaluation method for state of high-capacity power transformer oil pump Download PDFInfo
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- CN117267149A CN117267149A CN202311535062.8A CN202311535062A CN117267149A CN 117267149 A CN117267149 A CN 117267149A CN 202311535062 A CN202311535062 A CN 202311535062A CN 117267149 A CN117267149 A CN 117267149A
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- 238000011156 evaluation Methods 0.000 title claims abstract description 15
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- 239000013598 vector Substances 0.000 claims description 11
- 239000002923 metal particle Substances 0.000 claims description 9
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- 230000017525 heat dissipation Effects 0.000 abstract 1
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- 239000004215 Carbon black (E152) Substances 0.000 description 2
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0088—Testing machines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Abstract
The invention provides an online sensing device and an evaluation method for the state of a high-capacity power transformer oil pump, and belongs to the technical field of transformer oil pump state monitoring; the technical problem of real-time online evaluation of the working state of the power transformer oil pump is solved; the device comprises a disc motor and an oil pump, wherein an electromagnet is respectively fixed on the outer surface of an inlet and an outlet of the oil pump, four pressure sensors are respectively fixed on the inner surface of the inlet and the outlet of the oil pump corresponding to the position of the electromagnet and the opposite side position of the electromagnet, a flow sensor is also arranged at the outlet of the oil pump, a speed sensor is arranged on a disc motor shaft, four distance measuring units are equidistantly arranged on the upper surface of a shell of the disc motor, the axial deviation and the inclination of an impeller are monitored through the four distance measuring units, and a laser generator and a laser receiver are arranged on the inner surface of the shell of the oil pump; the invention is applied to the power transformer oil pump, and ensures the normal circulation operation of a high-capacity power transformer oil way and timely heat dissipation.
Description
Technical Field
The invention provides an online state sensing device and an online state evaluating method for a high-capacity power transformer oil pump, and belongs to the technical field of transformer oil pump state monitoring and evaluating.
Background
The transformer dissipates heat in time through the oil circulation and the fan, and the oil pump is an important cooling component of the high-capacity transformer strong oil circulation, so that enough power can be provided for the transformer oil circulation, and the normal circulation operation of an oil way is ensured. At present, a disc type motor is basically adopted in a transformer oil pump, a stator is directly fixed in an oil pump shell, and a rotor is connected with an oil pump impeller through a shaft and drives the impeller to rotate. The axial air gap between the rotor and the stator is very small and is only 1mm, and the following problems are very easy to occur due to bearing abrasion in long-term operation: (1) the rotor and the shaft are loosened and offset, and collide with the stator or the motor shell, and the speed of the shaft is lower than that of the rotor; (2) the impeller and the shaft are loosened and offset and collide with the oil pump shell, at the moment, the speed of the impeller is lower than that of the shaft, and the distance between the impeller and the upper surface of the motor is reduced; (3) the bearing is worn out for a long time and fails to fix the supporting shaft, the shaft tilts, the rotor and the stator are caused, the impeller collides with the oil pump shell, and the impeller tilts at the moment. The rotor and the shaft are loosened, offset and inclined slightly, the air gap change influences the magnetic field distribution to reduce the motor performance, and heavy causes the inside collision of the oil pump to generate metal particles which enter the transformer body to cause discharge, thereby seriously threatening the safe operation of the transformer.
The faults of the transformer oil pump commonly seen at present are mainly divided into two cases: firstly, the oil pump lift is not properly selected, so that the flow speed of insulating oil is too high, the oil flow of a transformer body is electrified, and the chromatographic data of the insulating oil of the body is abnormal; secondly, phenomena such as a rotor and an impeller broom appear in the oil pump, generated metal particles enter the transformer body, suspended particles discharge after long-time accumulation, and abnormal chromatographic data of body insulating oil is caused. At present, no effective technical means is available for sensing and evaluating the running state of the transformer oil pump on line in advance, so that further expansion of faults is avoided.
Chinese patent CN105804981B monitors the offset of stator and rotor in X, Y, Z direction by arranging 8 induction coils in the stator of oil pump, but this method needs to add 8 coils in the stator slot to change the original structure of the motor, affect the electromagnetic performance of the motor, add stator coils, and easily cause the collision between the coils and the rotor. Secondly, the method can only monitor the radial stator and rotor structure of the traditional asynchronous motor, cannot be applied to the novel oil pump disc type axial stator and rotor motor structure, and has low universality.
The Chinese patent CN112065705A judges whether the oil-submerged pump has faults by adding one oil-submerged pump sampling port on the basis of the existing transformer pipeline, respectively taking oil samples from the oil-submerged pump sampling port and the transformer body and analyzing dissolved gas in the oil and comparing the total hydrocarbon content of the dissolved gas in the two oil samples. The method is simple and easy to operate, but when the stator and the rotor in the oil pump collide, the total hydrocarbon in the oil is not necessarily changed, the fault judging method is single, the fault is judged only by means of dissolved gas in the oil, and the condition of missing report is easy to occur.
Disclosure of Invention
The invention provides an on-line sensing device and an evaluation method for the state of a high-capacity power transformer oil pump in order to effectively monitor whether the power transformer oil pump has fault defects such as collision and whether the oil pump is in a rated working state.
In order to solve the technical problems, the invention adopts the following technical scheme: the on-line state sensing device for the high-capacity power transformer oil pump comprises a transformer oil pump, wherein the transformer oil pump comprises a disc motor, the disc motor comprises a disc motor shell, a disc motor stator is fixed inside the disc motor shell, a disc motor winding is embedded in a groove of the disc motor stator, a disc motor rotor is arranged on the upper side of the disc motor stator, the disc motor rotor is fixed on a shaft, one end of the shaft is connected with the disc motor stator, the other end of the shaft extends out of the disc motor shell to be fixedly connected with an impeller, the oil pump comprises an oil pump shell, an oil pump inlet and an oil pump outlet which are arranged on the oil pump shell, wherein the impeller is positioned inside the oil pump shell, electromagnets are respectively fixed on the outer surfaces of the oil pump inlet and the oil pump outlet, pressure sensors are respectively arranged on the inner surfaces of the oil pump inlet and the oil pump outlet corresponding to the positions and opposite sides of the electromagnets, the device is used for monitoring metal particles in an oil pump, a flow sensor is further arranged at an outlet of the oil pump, a speed sensor is arranged on a shaft and used for monitoring the rotating speed of the shaft, four distance measuring units are equidistantly arranged on the upper surface of a disc type motor shell and used for monitoring the axial deviation and the inclination of an impeller, a laser generator and a laser receiver are arranged on the inner surface of the oil pump shell and used for monitoring the rotating speed of the impeller, a current sensor is arranged at a stator winding of the disc type motor and used for monitoring the current of the stator winding of the disc type motor, a data transmission unit is further arranged on the oil pump shell and is respectively connected with the pressure sensor, the flow sensor, the speed sensor, the distance measuring units, the laser generator, the laser receiver and the current sensor, and sending the sensor data to an external computer.
The disc motor stator, the disc motor rotor and the impeller are concentrically connected through a shaft.
The four distance measuring units are respectively arranged at the positions of 0 DEG, 90 DEG, 180 DEG and 270 DEG on the upper surface of the disc motor housing with the axial distance R and are used for measuring the distance from the impeller to the upper surface of the disc motor housing in the X, Y direction, and the axial direction is taken as the Z axis.
The impeller is uniformly provided with blades for providing power for oil circulation.
An online evaluation method for the state of a high-capacity power transformer oil pump adopts an online sensing device for the state of the high-capacity power transformer oil pump, and comprises the following steps:
s1: monitoring whether collision exists inside the oil pump: applying rated voltage to the disc type motor winding, leading the same current into the two electromagnets, respectively calculating the difference value of the two pressure sensors at the inlet of the oil pump and the difference value of the two pressure sensors at the outlet of the oil pump, comparing the two difference values, and if the difference exceeds 20%, sending out a collision alarm signal inside the oil pump;
s2: monitoring whether the pump lift is matched with the oil path resistance: obtaining a rated working condition point of the oil pump by drawing an intersection point of a resistance characteristic curve of a transformer pipe network system and an oil pump working characteristic curve, comparing an actual current of a stator winding of the oil pump with a rated current value and an actual flow of pipeline oil with a rated flow value, and sending an oil pump lift and oil path resistance mismatch alarm signal if a deviation between a flow sensor value and the rated flow value or a deviation between the current sensor value and the rated current value exceeds 10%;
s3: if no alarm signal appears, no collision exists in the oil pump and the oil pump is in a rated operation condition, the oil pump operation state is automatically evaluated, the rotating speed of the shaft is obtained through a speed sensor and is compared with the rated rotating speed, and the fixed tightness degree of the rotor of the disc type motor and the shaft is evaluated;
then, controlling the laser generator to continuously send out signals, recording the frequency of the signals received by the laser receiver, calculating to obtain the rotating speed of the impeller, comparing the rotating speed with the rotating speed of the shaft, and evaluating the fixing tightness degree of the impeller and the shaft;
then calculating the average distance between the impeller and the upper surface of the disc type motor shell through four distance measuring units, comparing the average distance with the initial value of the impeller distance from the upper surface of the disc type motor shell, and evaluating the axial offset distance of the impeller;
finally, calculating the normal vector of the impeller plane by adopting three distance measuring units, and evaluating the inclination of the impeller by the normal vector of the impeller plane and the angle of the Z axis;
and obtaining the healthy operation index of the oil pump according to the fixed tightness degree of the disc type motor rotor and the shaft, the fixed tightness degree of the impeller and the shaft, the axial offset distance of the impeller and the inclination of the impeller.
The tightness degree of the rotor and the shaft of the disc type motor is expressed by a state quantity A, and the expression of A is as follows:
；
in the above formula: n is n 1 The rated rotational speed value of the oil pump is defined, and n is the rotational speed of the shaft detected by the speed sensor.
The tightness of the impeller to the shaft is represented by a state quantity B, the expression of B being as follows:
；
in the above formula: n is the rotation speed of the shaft detected by the speed sensor, n 2 For the impeller rotation speed calculated by the laser receiver, the unit is r/min, n 2 =60×f/L, f is the signal frequency of the laser receiver, L is the number of blades on the impeller.
The impeller axial offset distance is represented by a state quantity C, and the expression of C is as follows:
；
in the above formula: p is the average height of the impeller from the upper surface of the disc motor housing calculated by the four distance measuring units, and q is the initial value of the impeller from the upper surface of the disc motor housing.
The impeller inclination is represented by a state quantity D, and the expression of D is as follows:
；
in the above formula:θis the inclination of the plane of the impeller,θthe calculation formula of (2) is as follows:
θ=；
in the above formula: z is Z 1 For the axial distance between the impeller and the upper surface of the disc motor housing measured by the first distance measuring unit located at the position of the positive half axis of the upper surface X of the disc motor housing, Z 2 For the axial distance between the impeller and the upper surface of the disc motor housing measured by the second distance measuring unit positioned at the position of the Y positive half axis on the upper surface of the disc motor housing, Z 3 The axial distance between the impeller and the upper surface of the disc motor shell, which is measured by a third distance measuring unit positioned at the position of the X negative half shaft on the upper surface of the disc motor shell, is R, which is the horizontal plane radial distance between the distance measuring unit and the upper surface of the disc motor shell.
The calculation formula of the healthy operation index of the oil pump is as follows:
；
in the above formula: p is the healthy operation index of the oil pump;
the health condition of the transformer oil pump is evaluated by the health index P, and the judgment mode is as follows:
。
compared with the prior art, the invention has the following beneficial effects: the invention can monitor whether the oil pump of the transformer has fault defects such as collision and the like and whether the oil pump is in a rated working state or not and send out an alarm signal on line, can evaluate the normal rated working state of the oil pump through the external sensor on the basis of not changing the structure of the original disc motor or the oil pump, can judge whether the oil pump has the defects such as collision and the like, and can effectively perform on-line sensing and evaluation on the safe operation of the transformer.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a schematic diagram of the structure of the device of the present invention;
fig. 2 is a schematic diagram of a distribution structure of 4 ranging units;
FIG. 3 is a schematic diagram of impeller speed monitoring;
FIG. 4 is a flow chart of the method of the present invention;
in the figure: the motor comprises a disk motor stator 1, a disk motor winding 2, a disk motor rotor 3, a shaft 4, a first bearing 5, a second bearing 6, a disk motor shell 7, an impeller 8, a first electromagnet 9, a second electromagnet 10, a first pressure sensor 11, a second pressure sensor 12, a speed sensor 13, an oil pump shell 14, an oil pump inlet 15, an oil pump outlet 16, a flow sensor 17, a first ranging unit 18, a second ranging unit 19, a third ranging unit 20, a fourth ranging unit 21, a laser generator 22, a laser receiver 23, a data transmission unit 24, a computer 25, a current sensor 26, a third pressure sensor 27, a fourth pressure sensor 28 and a blade 29.
Detailed Description
As shown in fig. 1 to 3, the present invention provides an on-line sensing device for the state of a high-capacity power transformer oil pump, which mainly comprises a disc motor stator 1, a disc motor winding 2, a disc motor rotor 3, a shaft 4, a first bearing 5, a second bearing 6, a disc motor housing 7, an impeller 8, a first electromagnet 9, a second electromagnet 10, a first pressure sensor 11, a second pressure sensor 12, a speed sensor 13, an oil pump housing 14, an oil pump inlet 15, an oil pump outlet 16, a flow sensor 17, a first ranging unit 18, a second ranging unit 19, a third ranging unit 20, a fourth ranging unit 21, a laser generator 22, a laser receiver 23, a data transmission unit 24, a computer 25, a current sensor 26, a third pressure sensor 27, a fourth pressure sensor 28 and a blade 29. Wherein disc motor stator 1 is fixed in disc motor housing 7 and is connected with the one end of axle 4 through first bearing 5, disc motor winding 2 inlays in disc motor stator 1's inslot, and axle 4 passes disc motor rotor 3 and reliable zonulae occludens with it, and the other end of axle 4 wears disc motor housing 7 through first bearing 6, later with reliable zonulae occludens of impeller 8, and first bearing 5 and second bearing 6 all play the supporting and fixing effect, and wherein disc motor stator 1, disc motor rotor 3 and impeller 8 pass through axle 4 concentric connection.
In order to avoid the influence of the gravity of the oil on the pressure sensors, the first pressure sensor 11 and the second pressure sensor 12 are respectively fixed on the inner surface side of the oil pump inlet 15 and the oil pump outlet 16, and the first electromagnet 9 and the second electromagnet 10 are respectively fixed on the outer surfaces of the oil pump inlet 15 and the oil pump outlet 16 at positions corresponding to the first pressure sensor 11 and the second pressure sensor 12. A third pressure sensor 27 and a fourth pressure sensor 28 are fixed to opposite sides of the second pressure sensor 12 and the first pressure sensor 11 for monitoring oil pressure at the same height position. By making the difference between the first pressure sensor 11 and the fourth pressure sensor 28 and the second pressure sensor 12 and the third pressure sensor 27, the interference of the oil pressure of the oil pump at the inlet and outlet of the current position is eliminated. When the oil pump has faults such as stator and rotor friction, generated metal particles can be adsorbed on the pressure sensor due to the attraction of the electromagnet at the inlet and outlet of the oil pump, the pressure generated by adsorption of the metal particles is obtained after oil pressure interference is eliminated, and the pressure deviation generated by adsorption of the metal particles at the inlet and outlet of the oil pump is compared to judge whether the stator and rotor friction faults exist.
A speed sensor 13 is mounted at one end of the shaft 4 after passing through the impeller 8 for monitoring the rotational speed of the shaft 4. A laser generator 22 and a laser receiver 23 are mounted on the inner surface of the oil pump housing 14 for monitoring the rotational speed of the impeller 8. A data transmission unit 24 is installed on the inner surface of the oil pump housing 14 for transmitting the monitoring data to a computer 25, and a flow sensor 17 is installed at the oil pump outlet 16 on the inner surface of the oil pump housing 14 for monitoring the oil flow rate. The current sensor 26 is used to monitor disc motor stator winding current. The direction of the axis 4 is the coordinate Z-axis direction.
As shown in fig. 2, 4 ranging units are respectively distributed at positions of 0 °, 90 °, 180 °, 270 ° from the upper surface of the disk motor housing 7 at a distance R from the shaft 4 for measuring the distance of the impeller 8 to the upper surface of the disk motor housing 7 in the X, Y direction as the height value of the impeller 8. Wherein the first ranging unit 18 is in the X positive half-axis position, the second ranging unit 19 is in the Y positive half-axis position, the third ranging unit 20 is in the X negative half-axis position, and the fourth ranging unit 21 is in the Y negative half-axis position.
As shown in fig. 3, when the impeller 8 rotates, the laser generator 22 emits a signal, and when the laser light irradiates the blade 29, the laser receiver 23 receives the signal, so that when the frequency of the signal received by the laser receiver 23 is f, the impeller rotation speed n 2 =60×f/L, where L is the number of blades on the impeller.
As shown in fig. 4, the process of performing the oil pump state evaluation by using the on-line sensing device for the oil pump state of the high-capacity power transformer is as follows: firstly, the pressure generated by adsorption of metal particles in oil at the inlet and outlet of the oil pump is monitored through two electromagnets and four pressure sensors, and if the pressure deviation of the inlet and outlet exceeds 20%, the collision inside the oil pump is judged. When metal particles in oil are normal, monitoring whether the oil pump operates under a rated working condition, and if the deviation between the actual flow or current and the rated value exceeds 10%, judging that the lift of the oil pump is not matched with the resistance of a transformer oil way. When all are normal, the oil pump is evaluated on line, the fastening degree of the rotor and the shaft, the fastening degree of the impeller and the shaft, the axial offset of the impeller and the inclination of the impeller are respectively evaluated, and finally the healthy operation index of the oil pump is obtained, wherein the specific steps are as follows:
step one: monitoring whether collision exists inside the oil pump: the rated voltage is applied to the disc motor winding 2, the first electromagnet 9 and the second electromagnet 10 are supplied with the same current, the two differences are compared, namely, the difference between the first pressure sensor 11 and the fourth pressure sensor 28 and the difference between the second pressure sensor 12 and the third pressure sensor 27 are compared, and if the two differences exceed 20%, a collision alarm signal exists in the oil pump.
Step two: monitoring whether the pump lift is matched with the oil path resistance: and drawing an intersection point of a resistance characteristic curve of the transformer pipe network system and an oil pump working characteristic curve to obtain a rated working condition point of the oil pump, comparing an actual current of a stator winding with a rated current value and an actual flow of pipeline oil with a rated flow value, and if the deviation between a flow sensor value and the rated flow value or the deviation between the current sensor value and the rated current value exceeds 10%, sending out an oil pump lift and oil path resistance mismatch alarm signal.
Step three: evaluate how tightly the disc motor rotor 3 is fixed to the shaft 4: if no alarm signal appears, no collision exists in the oil pump and the oil pump is in the rated operation condition, and the oil pump operation state is automatically evaluated. First, the speed sensor 13 is used to obtain the rotation speed n of the shaft 4 and the rated rotation speed n of the oil pump 1 The comparison is made to form a state quantity a whose expression is as follows:
（1）。
step four: the degree of tightness of the impeller 8 with the shaft 4 was evaluated: the laser generator 22 is controlled to continuously emit a signal, and the frequency f of the signal received by the laser receiver 23 is recorded. Calculating to obtain the impeller rotating speed n 2 The state quantity B is formed in comparison with the rotational speed of the shaft 4, and its expression is as follows:
n 2 =60×f/L（2）；
wherein L is the number of blades on the impeller;
（3）。
step five: the axial offset distance of the impeller 8 is evaluated, and the measured value of the first distance measuring unit 18, namely the height Z of the impeller, is obtained 1 Second distance measuring unit 19 measuresThe value is the height Z of the impeller 2 The third distance measuring unit 20 measures the height Z of the impeller 3 The fourth distance measuring unit 21 measures the height Z of the impeller 4 And an average value p of the heights of the four impellers, and is compared with an initial value q of the distance from the impeller 8 to the disc motor housing 7 to form a state quantity C, the expression of which is taken as follows:
p=（Z 1 +Z 2 +Z 3 +Z 4 ）/4（4）；
（5）。
step six: evaluation of shaft 4 and impeller 8 inclination: the axial direction is taken as the Z coordinate, the first ranging unit direction is taken as the X coordinate, the second ranging unit direction is taken as the Y coordinate, the center of the upper surface of the disc motor shell 7 is taken as the origin, and according to the measurement results of the first ranging unit 18, the second ranging unit 19 and the third ranging unit 20, three point coordinates (R, 0 and Z 1 ）、G（0、R、Z 2 ）、V（-R、0、Z 3 ) WhereinVector is (-R, R, Z) 2 -Z 1 ）、/>Vectors (-R, -R, Z) 3 -Z 2 ）、/>Vectors are (-2R, 0, Z) 3 -Z 1 ）。
Set the plane normal vector of the impeller(F, G, H), normal vector->Perpendicular to the plane, i.e. with->、/>、/>The vector is vertical. According to equation 6, the normal vector of the impeller plane is calculated>As shown in equation 7. Vector +.>Is>(0, 1) included angleθNamely the inclination of the impeller plane. Obtaining a state quantity D about the inclination of the impeller according to a formula 9;
（6）；
（7）；
（8）；
（9）。
step seven: the computer calculates the health index P of the transformer oil pump according to the formula 10;
（10）；
the health condition of the transformer oil pump is evaluated by the health index P, and the judgment mode is as follows:
（11）。
finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (10)
1. The utility model provides an online perception device of large capacity power transformer oil pump state, includes the transformer oil pump, the transformer oil pump includes disc motor, disc motor includes disc motor housing, is fixed with disc motor stator in disc motor housing inside, disc motor stator's inslot is inlayed and is had disc motor winding, disc motor stator upside is provided with disc motor rotor, disc motor rotor fixes on the axle, the one end and the disc motor stator of axle are connected, the other end of axle stretches out disc motor housing and impeller fixed connection, the oil pump includes oil pump housing and sets up oil pump import and oil pump export on the oil pump housing, wherein the impeller is located oil pump housing inside, its characterized in that: the outer surfaces of the oil pump inlet and the oil pump outlet are respectively fixed with an electromagnet, the inner surfaces of the oil pump inlet and the oil pump outlet are respectively provided with a pressure sensor corresponding to the position and the opposite side position of the electromagnet and used for monitoring metal particles in the oil pump, the oil pump outlet is also provided with a flow sensor, a speed sensor is arranged on the shaft and used for monitoring the rotating speed of the shaft, four distance measuring units are equidistantly arranged on the upper surface of the disc type motor shell and used for monitoring the axial deviation and the inclination of the impeller, the laser generator and the laser receiver are arranged on the inner surface of the oil pump shell and used for monitoring the rotating speed of the impeller, the current sensor is arranged at the stator winding of the disc motor and used for monitoring the current of the stator winding of the disc motor, the data transmission unit is further arranged on the oil pump shell and is respectively connected with the pressure sensor, the flow sensor, the speed sensor, the ranging unit, the laser generator, the laser receiver and the current sensor, and sensor data are sent to an external computer.
2. The on-line sensing device for the state of a high-capacity power transformer oil pump according to claim 1, wherein: the disc motor stator, the disc motor rotor and the impeller are concentrically connected through a shaft.
3. The on-line sensing device for the state of a high-capacity power transformer oil pump according to claim 1, wherein: the four distance measuring units are respectively arranged at the positions of 0 DEG, 90 DEG, 180 DEG and 270 DEG on the upper surface of the disc motor housing with the axial distance R and are used for measuring the distance from the impeller to the upper surface of the disc motor housing in the X, Y direction, and the axial direction is taken as the Z axis.
4. The on-line sensing device for the state of a high-capacity power transformer oil pump according to claim 1, wherein: the impeller is uniformly provided with blades for providing power for oil circulation.
5. An online evaluation method for the state of a high-capacity power transformer oil pump, which adopts the online sensing device for the state of the high-capacity power transformer oil pump according to any one of claims 1 to 4, and is characterized in that: the method comprises the following steps:
s1: monitoring whether collision exists inside the oil pump: applying rated voltage to the disc type motor winding, leading the same current into the two electromagnets, respectively calculating the difference value of the two pressure sensors at the inlet of the oil pump and the difference value of the two pressure sensors at the outlet of the oil pump, comparing the two difference values, and if the difference exceeds 20%, sending out a collision alarm signal inside the oil pump;
s2: monitoring whether the pump lift is matched with the oil path resistance: obtaining a rated working condition point of the oil pump by drawing an intersection point of a resistance characteristic curve of a transformer pipe network system and an oil pump working characteristic curve, comparing an actual current of a stator winding of the oil pump with a rated current value and an actual flow of pipeline oil with a rated flow value, and sending an oil pump lift and oil path resistance mismatch alarm signal if a deviation between a flow sensor value and the rated flow value or a deviation between the current sensor value and the rated current value exceeds 10%;
s3: if no alarm signal appears, no collision exists in the oil pump and the oil pump is in a rated operation condition, the oil pump operation state is automatically evaluated, the rotating speed of the shaft is obtained through a speed sensor and is compared with the rated rotating speed, and the fixed tightness degree of the rotor of the disc type motor and the shaft is evaluated;
then, controlling the laser generator to continuously send out signals, recording the frequency of the signals received by the laser receiver, calculating to obtain the rotating speed of the impeller, comparing the rotating speed with the rotating speed of the shaft, and evaluating the fixing tightness degree of the impeller and the shaft;
then calculating the average distance between the impeller and the upper surface of the disc type motor shell through four distance measuring units, comparing the average distance with the initial value of the impeller distance from the upper surface of the disc type motor shell, and evaluating the axial offset distance of the impeller;
finally, calculating the normal vector of the impeller plane by adopting three distance measuring units, and evaluating the inclination of the impeller by the normal vector of the impeller plane and the angle of the Z axis;
and obtaining the healthy operation index of the oil pump according to the fixed tightness degree of the disc type motor rotor and the shaft, the fixed tightness degree of the impeller and the shaft, the axial offset distance of the impeller and the inclination of the impeller.
6. The method for online evaluation of the state of a high-capacity power transformer oil pump according to claim 5, wherein the method comprises the following steps: the tightness degree of the rotor and the shaft of the disc type motor is expressed by a state quantity A, and the expression of A is as follows:
；
in the above formula: n is n 1 The rated rotational speed value of the oil pump is defined, and n is the rotational speed of the shaft detected by the speed sensor.
7. The method for online evaluation of the state of a high-capacity power transformer oil pump according to claim 6, wherein the method comprises the following steps: the tightness of the impeller to the shaft is represented by a state quantity B, the expression of B being as follows:
；
in the above formula: n is the rotation speed of the shaft detected by the speed sensor, n 2 For the impeller rotation speed calculated by the laser receiver, the unit is r/min, n 2 =60×f/L, f is the signal frequency of the laser receiver, L is the number of blades on the impeller.
8. The method for online evaluation of the state of a high-capacity power transformer oil pump according to claim 7, wherein the method comprises the following steps: the impeller axial offset distance is represented by a state quantity C, and the expression of C is as follows:
；
in the above formula: p is the average height of the impeller from the upper surface of the disc motor housing calculated by the four distance measuring units, and q is the initial value of the impeller from the upper surface of the disc motor housing.
9. The method for online evaluation of the state of a high-capacity power transformer oil pump according to claim 8, wherein the method comprises the following steps: the impeller inclination is represented by a state quantity D, and the expression of D is as follows:
；
in the above formula:θis the inclination of the plane of the impeller,θthe calculation formula of (2) is as follows:
θ=；
in the above：Z 1 For the axial distance between the impeller and the upper surface of the disc motor housing measured by the first distance measuring unit located at the position of the positive half axis of the upper surface X of the disc motor housing, Z 2 For the axial distance between the impeller and the upper surface of the disc motor housing measured by the second distance measuring unit positioned at the position of the Y positive half axis on the upper surface of the disc motor housing, Z 3 The axial distance between the impeller and the upper surface of the disc motor shell, which is measured by a third distance measuring unit positioned at the position of the X negative half shaft on the upper surface of the disc motor shell, is R, which is the horizontal plane radial distance between the distance measuring unit and the upper surface of the disc motor shell.
10. The method for online evaluation of the state of a high-capacity power transformer oil pump according to claim 9, wherein the method comprises the following steps: the calculation formula of the healthy operation index of the oil pump is as follows:
；
in the above formula: p is the healthy operation index of the oil pump;
the health condition of the transformer oil pump is evaluated by the health index P, and the judgment mode is as follows:
。
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