CN112923977A - Device and method for observing dynamic behaviors of impurities with different particle sizes in oil passage of transformer - Google Patents
Device and method for observing dynamic behaviors of impurities with different particle sizes in oil passage of transformer Download PDFInfo
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Abstract
The invention relates to a device and a method for observing the kinetic behavior of impurities with different particle diameters in an oil duct of a transformer, wherein the device comprises a winding model, a particle dynamics observation system, an oil tank, a radiating fin, a particle emitter, a mesh fixing screen and a direct current power supply module. The invention can effectively observe the dynamic behavior of impurities with different particle sizes in the oil duct of the transformer under the actual working condition, is beneficial to researching the relationship between the dynamic behavior of the impurities with different particle sizes and the partial discharge of the transformer insulating oil, and further researches the insulating property of the transformer.
Description
Technical Field
The invention relates to a device and a method for observing dynamic behaviors of impurities with different particle sizes in an oil passage of a transformer. Belongs to the technical field of high-end intelligent transformers.
Background
The transformer is an important power transmission and transformation device in a power system, and along with the improvement of the voltage level of a power grid and the development of an intelligent power grid, the manufacturing difficulty of the power transformer is increased. An important aspect of high-end intelligent power transformers is the intelligent monitoring of the insulation performance of the power transformer, and the insulation performance of the power transformer depends on the quality of transformer oil to a great extent, so that the intelligent monitoring of the transformer oil is very important.
In the links of manufacturing, installing, operating, maintaining and the like of the power transformer, impurity particles with different particle sizes are doped in transformer oil, the impurity particles do not stop in an oil duct, but move ceaselessly along with the flowing of the oil, and have no fixed positions, and when the impurity particles move to a weak insulation part, partial discharge can be caused, so that the quality of the transformer oil is reduced rapidly. With the rapid increase of electricity consumption in partial areas (such as Jiangsu), the power transformer operates under higher load or full load, the partial discharge probability of transformer oil is increased, and the insulation performance of transformer oil is further reduced. In order to ensure the insulating property of the transformer, the intelligent monitoring of the dynamic behavior of the impurity particles in the oil duct of the transformer has very important significance.
The traditional method for observing the dynamic behavior of impurity particles in the oil passage of the transformer does not consider the particle size of the impurities, but mixes the motions of all the particle size impurities into a whole. However, when the transformer actually works, impurities with different particle sizes exist in the oil duct, and the mechanical behavior of the impurities with each particle size in the oil duct is different, so that the prior art cannot provide technical support and theoretical basis for intelligent monitoring of the dynamic behavior of the impurities with different particle sizes in the oil duct of the high-end intelligent power transformer.
Disclosure of Invention
The invention aims to overcome the defects and provides a device and a method for observing the dynamic behavior of impurities with different particle sizes in an oil passage of a transformer.
The purpose of the invention is realized as follows:
the device and the method for observing the dynamic behavior of the impurities with different particle diameters in the oil duct of the transformer are characterized in that: the device comprises a winding model, a particle dynamics observation system, an oil tank, a radiating fin, a particle emitter, a mesh screen and a direct-current power supply module;
the winding model comprises a winding cake and a winding shell; the plurality of winding cakes are uniformly arranged in the winding shell from top to bottom;
the number of the direct current power supply modules is multiple, the direct current power supply modules are respectively in one-to-one correspondence with the winding cakes, and the winding cake terminals are connected with the corresponding direct current power supply modules after being led out;
an oil passage in the horizontal direction is formed between every two adjacent winding cakes;
the particle dynamics observation system comprises a synchronous machine, a computer, a double-head laser source, a laser sheet and a CCD camera; the synchronous machine is respectively connected with the computer, the double-head laser source and the CCD camera;
the CCD camera and the double-head laser source are positioned on the same horizontal plane and are vertical to each other;
the double-head laser source and the oil duct to be observed are on the same horizontal plane, and the laser sheet is positioned between the double-head laser source and the oil duct and is arranged on a laser emission path of the double-head laser source;
the winding model, the oil tank and the radiating fins are connected through an oil circulation outer pipeline, the particle emitter is arranged on the oil circulation outer pipeline and close to the bottom of the winding model, and the mesh screen is arranged at an outlet of the particle emitter.
Furthermore, the winding shell is made of transparent organic glass materials, and the oil circulation outer pipeline is made of stainless steel materials.
Furthermore, the winding shell is uniformly provided with clamping grooves from top to bottom, the clamping grooves correspond to the winding cakes one to one, and two ends of each winding cake are embedded into the clamping grooves of the winding shell.
Furthermore, the winding cake is formed by closely arranging a plurality of arc-shaped nichrome strips, the plurality of nichrome strips have the same central angle, and the arc lengths of the plurality of nichrome strips are gradually increased from inside to outside; each nickel-chromium alloy strip is subjected to annealing softening treatment and is wrapped by B-grade insulating paper; the nichrome strips are connected in series end to end by a lead.
Furthermore, two thermocouples are arranged in each winding cake.
Furthermore, a round hand hole is formed in the oil circulation outer pipeline, and the particle emitter is connected with the oil circulation outer pipeline in a sealing mode through a flange at the round hand hole.
Furthermore, a valve, an ultrasonic flowmeter and an oil pump are arranged on the oil circulation outer pipeline, the valve comprises an oil drain valve, and the oil drain valve is located between the ultrasonic flowmeter and the particle emitter.
A method for observing the dynamic behavior of impurities with different particle sizes in an oil passage of a transformer comprises the following steps:
s1: installing a mesh screen at the outlet of the particle emitter, installing the particle emitter on an oil circulation outer pipeline, and opening a double-head laser source, wherein the laser pulse emission power of the double-head laser source is represented by the formula
Determining, wherein d is the aperture of the mesh-defining screen, PeMaximum laser pulse emission power, L, of the double-headed laser sourcesIs the distance from the double-head laser source to the observation oil channel, LcDistance from CCD camera to observation oil passage, d0The particle diameter is specified when the double-head laser source has the maximum laser pulse emission power;
s2: opening valves at various positions on an oil tank and an oil circulation outer pipeline, and opening an oil pump to slowly and slowly inject insulating oil into the winding model and the radiator at a low speed;
s3: the direct current power supply module is switched on to heat the winding cake, and the output power of each direct current power supply is
Wherein i is the number of the winding cake, P0Rating the no-load loss, P, for the transformerKStarting a particle emitter to emit particles into oil, wherein the rated short-circuit loss of the transformer is adopted, and K is a load coefficient;
s4: the method comprises the steps that a synchronizer sends synchronous control pulses to a double-head laser source and a CCD camera, so that the CCD camera sends a first beam of laser pulses while capturing any laser reflected by particles, the first beam of laser pulses illuminates the particles in an oil passage through a laser sheet, the CCD camera captures a first frame image, after a specific delay time delta t, the double-head laser source sends a second beam of laser pulses, the CCD camera captures a second frame image, then the double-head laser source sends the laser pulses every specific delay time delta t, the CCD camera captures corresponding frame images, a computer receives the frame images acquired by the CCD camera and performs image processing, and corresponding particle moving images are drawn;
s5: after the computer draws enough particle motion images, the synchronous machine sends synchronous control pulses to enable the double-head laser source and the CCD camera to be closed simultaneously, then the oil drain valve is opened, and insulating oil in the experimental device is drained;
s6: the particle emitter is removed and the mesh screen of different apertures is replaced at its outlet, returning to S1 for circulation.
Further, the height of the horizontal oil passage is Hduct；
Hduct is expressed by
Determining;
wherein, WdiscIs the radial width of the winding cake, HdiscIs the height of the winding cake, routIs the outer diameter of the winding cake，rinIs the inner diameter of the winding cake;
the relation between the inner diameter and the outer diameter of the winding cake is
The central angle of the winding cake is
By expression
Determining; wherein,
for the proportionality coefficient, take 1.6.
Compared with the prior art, the invention has the beneficial effects that:
according to the device and the method for observing the dynamic behavior of the impurities with different particle diameters in the transformer oil passage, the particle diameters of the particles in the oil passage are controlled by changing the aperture of the mesh-fixing screen, and then the dynamic behavior of the impurities with different particle diameters in the oil passage is observed by using the particle dynamics observation system, so that the device and the method are beneficial to exploring the relationship between the partial discharge and the particle motion of the transformer oil, and further provide a theoretical basis for researching the insulation performance of a transformer.
Drawings
FIG. 1 is a schematic diagram of an apparatus for observing the dynamic behavior of impurities with different particle sizes in an oil passage of a transformer.
Fig. 2 is a schematic diagram of the connection between the winding model and the dc power supply.
FIG. 3 is a schematic diagram of the relative positions of the winding cake, the dual head laser source, the laser sheet, and the CCD camera.
Fig. 4 is a partially enlarged view of fig. 2.
In the figure:
the device comprises a winding model 1, a particle dynamics observation system 2, an oil circulation outer pipeline 3, a valve 4, an oil drain valve 401, an oil tank 5, a cooling fin 6, an ultrasonic flowmeter 7, an oil pump 8, a particle emitter 9, a mesh screen 10, a direct current power supply module 11, a winding cake 101, a thermocouple 102, an oil duct 103, a winding shell 104, a clamping groove 105, a synchronizer 201, a computer 202, a double-head laser source 203, a laser sheet 204 and a CCD camera 205.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Referring to fig. 1-3, the invention relates to a device for observing the dynamic behavior of impurities with different particle diameters in a transformer oil duct, which is used for researching the insulation performance of transformer oil under the actual working condition, and the device for observing the dynamic behavior of the impurities with different particle diameters in the transformer oil duct is shown in fig. 1, and the device comprises a winding model 1, a particle dynamics observing and measuring system 2, an oil circulation outer pipeline 3, a valve 4, an oil tank 5, a radiating fin 6, an ultrasonic flowmeter 7, an oil pump 8, a particle emitter 9, a mesh screen 10 and a direct-current power supply module 11;
referring to fig. 2, winding model 1 includes winding cake 101, thermocouple 102, oil passage 103, and winding shell 104; the winding cakes 101 are multiple, and the winding cakes 101 are uniformly arranged in the vertical direction; the winding cakes 101 are numbered from bottom to top in sequence as 1, 2, …, n-1 and n;
referring to fig. 2 and 4, the winding shell 104 is made of transparent organic glass material; the winding shell 104 is uniformly provided with clamping grooves 105 from top to bottom, the clamping grooves 105 correspond to the winding cakes 101, and two ends of the winding cakes 101 are embedded into the clamping grooves 105 of the winding shell 104;
referring to fig. 2 and 3, the winding cake 101 is fan-shaped, the winding cake 101 is formed by closely arranging a plurality of arc-shaped nichrome strips, the nichrome strips have the same central angle, the arc lengths of the nichrome strips gradually increase from short to long from inside to outside, and each nichrome strip is annealed and softened and is wrapped by a grade-B insulating paper; the nickel-chromium alloy strips are connected in series end to end by a lead; two thermocouples 102 are arranged inside the winding cake 101;
the number of the direct current power supply modules 11 is multiple, the direct current power supply modules correspond to the winding cakes 101 one by one, and the direct current power supply modules correspond to the winding cakes 101 and are numbered as 1, 2, …, n-1 and n from bottom to top;
the terminal of the winding cake 101 is connected with the corresponding direct current power supply module 11 after being led out;
a horizontal oil channel 103 is formed between two adjacent winding cakes 101, and the height of the horizontal oil channel 103 is Hduct；
HductBy expression
Determining;
wherein, WdiscIs the radial width of the winding cake 101, HdiscIs the height of the winding cake 101, routIs the outer diameter of the winding cake 101, rinIs the inner diameter of the winding cake 101;
the relation between the inner diameter and the outer diameter of the winding cake 101 is
The central angle of the winding cake 101 is
By expression
Determining; wherein,
taking the proportionality coefficient as 1.6;
the particle dynamics observation system 2 comprises a synchronous machine 201, a computer 202, a double-head laser source 203, a laser sheet 204 and a CCD camera 205; the CCD camera 205 is also referred to as a charge coupled camera;
the double-head laser source 203 and the oil channel 103 to be observed are on the same horizontal plane, and the laser sheet 204 is located between the double-head laser source 203 and the oil channel 103 and is arranged on a laser emission path of the double-head laser source 203;
the CCD camera 205 and the double-head laser source 203 are positioned on the same horizontal plane and are vertical to each other;
the synchronizer 201 is respectively connected with a computer 202, a double-head laser source 203 and a CCD camera 205, and the computer 202 receives and processes the particle motion images shot by the CCD camera 205;
the winding model 1, the oil tank 5 and the radiating fins 6 are connected through an oil circulation outer pipeline 3, the oil circulation outer pipeline 3 is made of stainless steel materials, and a valve 4, an ultrasonic flowmeter 7 and an oil pump 8 are arranged on the oil circulation outer pipeline 3;
the particle emitter 9 and the mesh screen 10 are arranged on the oil circulation outer pipeline 3 and are close to the bottom of the winding model 1; the oil circulation outer pipeline 3 is provided with a circular hand hole, the particle emitter 9 is hermetically connected with the oil circulation outer pipeline 3 through a flange at the circular hand hole, the mesh-fixing screen 10 is arranged at the outlet of the particle emitter 9, the particle emitter 9 emits particles to the oil in the oil circulation outer pipeline 3, and the mesh-fixing screen 10 is used for controlling the size of the particles entering the oil and enabling the particles to be uniformly distributed in the oil channel 103;
the valve 4 comprises an oil drain valve 401, and the oil drain valve 401 is positioned between the ultrasonic flowmeter 7 and the particle emitter 9;
the method for observing the dynamic behavior of the impurities with different particle sizes in the oil passage of the transformer comprises the following steps:
s1: installing a mesh screen 10 at the outlet of the particle emitter 9, installing the particle emitter 9 on the oil circulation outer pipeline 3, turning on a double-head laser source 203, wherein the laser pulse emission power of the double-head laser source 203 is represented by the formula
Wherein d is the pore diameter of the mesh-defining screen 10, PeIs the maximum laser pulse emission power, L, of the double-ended laser source 203sIs the distance, L, from the double-headed laser light source 203 to the observation oil passage 103cDistance d from the CCD camera 205 to the observation oil passage 1030The specified particle diameter at the maximum laser pulse emission power of the double-headed laser source 203;
s2: opening valves 4 at various positions on an oil tank 5 and an oil circulation outer pipeline 3, and opening an oil pump 8 to slowly and slowly inject insulating oil into the winding model 1 and the radiator 5 at a low speed;
s3: the DC power supply module 11 is turned on to heat the winding cake 101, and the output power of each DC power supply is
Wherein i is the number of the winding cake 101, P0Rated no-load loss, P, of the transformerKStarting a particle emitter 9 to emit particles into the oil, wherein the rated short-circuit loss of the transformer is represented by K which is a load coefficient;
s4: the synchronizer 201 sends a synchronization control pulse to the double-head laser source 203 and the CCD camera 205, so that the CCD camera 205 captures any laser reflected by the particles, the double-head laser source 203 sends a first laser pulse beam, the first laser pulse beam illuminates the particles in the oil channel 103 through the laser sheet 204, the CCD camera 205 captures a first frame image, after a specific delay time delta t, the double-head laser source 203 sends a second laser pulse beam, the CCD camera 205 captures a second frame image, then the double-head laser source 203 sends the laser pulse beam every specific delay time delta t, the CCD camera 205 captures a corresponding frame image, the computer 202 receives the frame image obtained by the CCD camera 205 and processes the image, and a corresponding particle motion image is drawn;
s5: after the computer 202 draws enough particle moving images, the synchronizer 201 sends synchronous control pulses to enable the double-head laser source 203 and the CCD camera 205 to be closed simultaneously, and then the oil drain valve 401 is opened to drain insulating oil in the experimental device;
s6: the particle emitter 9 is removed and the mesh screen 10 of a different aperture is replaced at its outlet, returning to S1 for circulation.
Example (b):
taking an oil-immersed transformer with the rated capacity of 630kVA and the rated voltage of 10kV as an example, the load loss of one phase in the rated state is 3150W, wherein the rated no-load loss is P0630W rated short circuit loss Pk2520W, the number n of winding cakes of the simulation transformer winding model is 10, and the inner diameter r of the winding cakesin690mm, outer diameter rout790mm, central angle
Is 20 DEG, the radial width W of the winding cakediscHeight H of single winding cake, 90mmdisc12mm, time delay delta t 10 mu s, maximum laser pulse emission power P of the double-ended laser sourcee20000kW, distance L from CCD camera to observation oil ductc0.2m, distance L from the double-head laser source to the observation oil channels0.18m, a predetermined particle diameter d at the maximum laser pulse emission power0The experimental procedure, set at 0.15mm, comprises the following steps:
the first step is as follows: a mesh screen 10 with the aperture d is arranged at the outlet of the particle emitter 9 to enable the particles to be sprayedThe sub-transmitter is arranged at a circular hand hole on the oil circulation outer pipeline, the mesh screens with five apertures selected in the embodiment are respectively 0.510mm, 0.350mm, 0245mm, 0198mm and 0.165mm, the double-head laser source is opened, and the power of the double-head laser source is according to the formula
Is determined to be P in turns1＝3823kW、 Ps2＝5672kW、Ps3＝8121kW、Ps410223kW and Ps5＝13120kW；
The second step is that: fixing ten groups of winding cakes 101 in a clamping groove 105 of a winding shell 104 according to the structure shown in fig. 2, wherein the ten winding cakes 101 are respectively numbered as 101 and 102 … from top to bottom, and the plurality of winding cakes 101 are not electrically connected, as shown in fig. 2, each winding cake 101 is connected with a corresponding direct current power supply module 11, and the plurality of direct current power supply modules 11 are sequentially numbered as 1101 and 1102 … from bottom to top;
the third step: the other elements in the system are connected as shown in fig. 1, and the relative positions of the CCD camera 205, the laser sheet 204 and the double-headed laser source 203 are shown in fig. 3;
the fourth step: opening an oil tank 5 and a valve 4, slowly injecting insulating oil into the winding model 1 and the radiating fins 6 at a low speed, observing the readings of the ultrasonic flowmeter 7, and adjusting an oil pump 8 to keep the insulating oil in the oil circulation outer pipeline 3 at a certain flow speed when the readings of the ultrasonic flowmeter 7 are stable;
the fifth step: according to the formula
When K is 1.2, the output power of each direct current power supply is P1＝2.5W、P2＝159W、P3＝317W、P4＝397W、P5＝476W、 P6＝556W、P7＝635W、P8＝635W、P9＝556W、P10When 524W is obtained, the direct current power supply module 11 is switched on to heat the winding cake 101 for the same time, and the particle emitter 9 is switched on to emit particles into the insulating oil;
and a sixth step: the synchronizer 201 sends a synchronization control pulse to the double-head laser source 203 and the CCD camera 205 through acquisition software, so that the CCD camera 205 captures any laser reflected by the particles, at the same time, the double-head laser source 203 sends a first laser pulse, the first laser pulse illuminates the particles in the oil channel 103 through the laser sheet 204, the CCD camera 205 captures a first frame image, after a specific delay time Δ t is 10 μ s, the double-head laser source 203 sends a second laser pulse, the CCD camera 205 captures a second frame image, and then every specific delay time Δ t is 10 μ s, the double-head laser source 203 sends a laser pulse, the CCD camera 205 captures a corresponding frame image, the computer 202 receives and processes the frame image acquired by the CCD camera 205, and draws a corresponding particle moving image;
according to the device and the method for observing the dynamic behavior of the impurities with different particle diameters in the oil passage of the transformer, the particle diameters of the particles in the oil passage 103 are controlled by changing the aperture of the fixed mesh screen 10, and then the dynamic behavior of the impurities with different particle diameters in the oil passage 103 is observed by using the particle dynamics observation system 2, so that the device and the method are beneficial to exploring the relation between the local discharge and the particle motion of the transformer oil, and further provide a theoretical basis for researching the insulation performance of the transformer.
In the above embodiments, the present invention is described only by way of example, but those skilled in the art after reading the present patent application may make various modifications thereto without departing from the spirit and scope of the present invention.
Claims (9)
1. The utility model provides an observation transformer oil duct in different particle diameter impurity dynamics action's device which characterized in that: the device comprises a winding model (1), a particle dynamics observation system (2), an oil tank (5), a radiating fin (6), a particle emitter (9), a mesh screen (10) and a direct-current power supply module (11);
the winding model (1) comprises winding cakes (101) and a winding shell (104), the winding cakes (101) are uniformly arranged in the winding shell (104) from top to bottom, and an oil duct (103) in the horizontal direction is formed between every two adjacent winding cakes (101);
a plurality of direct current power supply modules (11) are respectively in one-to-one correspondence with the plurality of winding cakes (101), and the terminals of the winding cakes (101) are connected with the corresponding direct current power supply modules (11) after being led out;
the particle dynamics observation system (2) comprises a synchronous machine (201), a computer (202), a double-head laser source (203), a laser sheet (204) and a CCD camera (205); the synchronous machine (201) is respectively connected with the computer (202), the double-head laser source (203) and the CCD camera (205);
the CCD camera (205) and the double-head laser source (203) are positioned on the same horizontal plane and are vertical to each other;
the double-head laser source (203) and the oil channel (103) to be observed are on the same horizontal plane, and the laser sheet (204) is located between the double-head laser source (203) and the oil channel (103) and arranged on a laser emission path of the double-head laser source (203);
the winding model (1), the oil tank (5) and the radiating fins (6) are connected through an oil circulation outer pipeline (3), the particle emitter (9) is arranged on the oil circulation outer pipeline (3) and is close to the bottom of the winding model (1), and the mesh determining screen (10) is arranged at an outlet of the particle emitter (9).
2. The device for observing the kinetic behavior of the impurities with different particle diameters in the oil passage of the transformer according to claim 1, is characterized in that: the winding shell (104) is made of transparent organic glass material, and the oil circulation outer pipeline (3) is made of stainless steel material.
3. The device for observing the kinetic behavior of the impurities with different particle diameters in the oil passage of the transformer according to claim 1, is characterized in that: the winding shell (104) is uniformly provided with clamping grooves (105) from top to bottom, the clamping grooves (105) correspond to the winding cakes (101) one by one, and two ends of each winding cake (101) are embedded into the clamping grooves (105) of the winding shell (104).
4. The device for observing the kinetic behavior of the impurities with different particle diameters in the oil passage of the transformer according to claim 1, is characterized in that: the winding cake (101) is formed by closely arranging a plurality of arc-shaped nichrome strips, the nichrome strips have the same central angle, and the arc lengths of the nichrome strips are gradually increased from inside to outside; annealing and softening each nichrome strip and wrapping the nichrome strip with B-grade insulating paper; the nichrome strips are connected in series end to end by a lead.
5. The device for observing the kinetic behavior of the impurities with different particle diameters in the oil passage of the transformer according to claim 1, is characterized in that: two thermocouples (102) are arranged in each winding cake (101).
6. The device for observing the kinetic behavior of the impurities with different particle diameters in the oil passage of the transformer according to claim 1, is characterized in that: the oil circulation outer pipeline (3) is provided with a circular hand hole, and the particle emitter (9) is hermetically connected with the oil circulation outer pipeline (3) through a flange at the circular hand hole.
7. The device for observing the kinetic behavior of the impurities with different particle diameters in the oil passage of the transformer according to claim 1, is characterized in that: a valve (4), an ultrasonic flowmeter (7) and an oil pump (8) are arranged on the oil circulation outer pipeline (3), the valve (4) comprises an oil drain valve (401), and the oil drain valve (401) is located between the ultrasonic flowmeter (7) and the particle emitter (9).
8. A method for observing the dynamic behavior of impurities with different particle sizes in an oil passage of a transformer is characterized by comprising the following steps of: the method comprises the following steps:
s1: a mesh screen (10) is arranged at the outlet of the particle emitter (9), the particle emitter (9) is arranged on an oil circulation outer pipeline (3), a double-head laser source (203) is opened, and the laser pulse emission power of the double-head laser source (203) is expressed by the formula
Determining, wherein,dthe aperture of the mesh screen (10) is determined,P e is a double-ended laser source (20)3) The maximum laser pulse emission power is set to be,L s the distance between the double-head laser source (203) and the observation oil channel (103),L c the distance d from the CCD camera (205) to the observation oil passage (103)0A specified particle diameter at the maximum laser pulse emission power of the double-headed laser source (203);
s2: opening valves (4) at various positions on an oil tank (5) and an oil circulation outer pipeline (3), and opening an oil pump (8) to slowly and slowly inject insulating oil into the winding model (1) and the radiator (6);
s3: the direct current power supply module (11) is turned on to heat the winding cake (101), and the output power of each direct current power supply is
Wherein,iis the number of the winding cake (101),P 0the no-load loss is rated for the transformer,P K the short-circuit loss is rated for the transformer,Kturning on a particle emitter (9) to emit particles into the oil for the load factor;
s4: the synchronous machine (201) sends synchronous control pulses to the double-head laser source (203) and the CCD camera (205), so that the CCD camera (205) captures any laser reflected by the particles, the double-head laser source (203) sends a first laser pulse beam, the first laser pulse beam illuminates the particles in the oil channel (103) through a laser sheet, the CCD camera (205) captures a first frame image, after a specific delay time delta t, the double-head laser source (203) sends a second laser pulse beam, the CCD camera (205) captures a second frame image, then every specific delay time delta t, the double-head laser source (203) sends the laser pulse, the CCD camera (205) captures a corresponding frame image, and the computer (202) receives and processes the frame image acquired by the CCD camera (205) and draws a corresponding particle moving image;
s5: after the computer (202) draws enough particle moving images, the synchronous machine (201) sends synchronous control pulses to enable the double-head laser source (203) and the CCD camera (205) to be closed simultaneously, and then an oil drain valve (401) is opened to drain insulating oil in the experimental device;
s6: the particle emitter (9) is removed, the mesh screen (10) with different apertures is replaced at the outlet, and the process returns to S1 for circulation.
9. The method for observing the kinetic behavior of the impurities with different particle diameters in the oil passage of the transformer according to claim 8, wherein the method comprises the following steps: the height of the horizontal oil passage (103) is
；
wherein,
is the radial width of the winding cake (101),
is the height of the winding cake (101),
is the outer diameter of the winding cake (101),
is the inner diameter of the winding cake (101);
the relation between the inner diameter and the outer diameter of the winding cake (101) is
The central angle of the winding cake (101) is
，
By expression
Determining; wherein,
for the proportionality coefficient, take 1.6.
Priority Applications (1)
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